 | | Vector 2X Compass
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Hello - I'm having some trouble figuring out how to wire Precision Navigation's Vector 2X Compass for use with the Handy Board. I've checked out the files in ".../software/contrib/tomb/" on the Handy Board site, but I'm sort of at a loss. Due to the (...) (25 years ago, 30-Nov-99, to lugnet.robotics.handyboard)
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| | Re: evaluate inverse cosine, sine in IC
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Another technique for finding trig functions and their inverses used by both HP and TI in their calculators is the CORDIC algrorithm. A description of the technique with lots of references can be found at: (...) (25 years ago, 29-Nov-99, to lugnet.robotics.handyboard)
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| | Re: evaluate inverse cosine, sine in IC
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Taylor series should converge quite rapidly. After 2 or 3 terms, the error is usually neglectable (depending or your demands, of course: this should be fine for up to a few decimals) For those not familiar with the Taylor expansion, I've added a (...) (25 years ago, 29-Nov-99, to lugnet.robotics.handyboard)
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| | Re: servo program, addendum
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Dear ? The initialization function is: enable_expbd_servos(1); per the latest library routines see handyboard web site. Bart Schrijver. ___...___ Reply Separator ___...___ Subject: servo program Author: Non-HP-dab8rs-85 (dab8rs_85@yahoo.com) at (...) (25 years ago, 29-Nov-99, to lugnet.robotics.handyboard)
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| | Re: servo program
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Here's a simple program that will make a servo move as the knob on the Handyboard is turned: int i; void main() { init_expbd_servos(1); while(1) { i= knob(); i = (i*10)+1000; printf("val %d\n",i); msleep(20L); servo0 = i; } } (...) (25 years ago, 29-Nov-99, to lugnet.robotics.handyboard)
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| | Re: servo program
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Dear ?: First off, your program contains an infinite loop; statement return(0); will never be reached. Also you told it that main does not return a value, yet you used e return in the end. This will generate a compiler error for sure. I belief the (...) (25 years ago, 29-Nov-99, to lugnet.robotics.handyboard)
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| | Re: evaluate inverse cosine, sine in IC
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I've been trying to do this as well. The problem I have found is that the Taylor series expansion needs to be developed near the solution to get accurate results. Some may wonder why finding the arcsine of a number might be of interest. If one has a (...) (25 years ago, 29-Nov-99, to lugnet.robotics.handyboard)
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| | servo program
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Can anyone please write me a brief servo motor program that will control two servos from the expansion board? This the one I had to control one, but did not work: void main(void) { while(1) { init_expbd_servos(1) servo0 = 1000 } return(0); } (...) (25 years ago, 29-Nov-99, to lugnet.robotics.handyboard)
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| | Re: Opto isolator
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Hi Tim, Try (URL) and (URL) seems to be a huge variety of MOC3x series optoisolators to choose from. You might be able to find a substitute for the MOC5003 or 4 that you're looking for. Good luck, (...) Great minds discuss ideas; Average minds (...) (25 years ago, 28-Nov-99, to lugnet.robotics.handyboard)
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| | Opto isolator
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Hi, I was wandering if anyone knew where I could get a MOC5003 or MOC5004 opto isolator. I tried looking on the motorola web site but could not find it. Does any one know where I coul something similiar to this that works the same way. TIM ___...___ (...) (25 years ago, 28-Nov-99, to lugnet.robotics.handyboard)
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| | digital outputs
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Hello everyone... I hav already connected a hc374 to Y0 of the expansion bus to get 8 digital outs, It works gr8. I need anouther 32 outputs which meens I need 4 more latch selects. Can I use Y1, Y2, Y3, Y4, and Y5 if needed? Y0 is used by (...) (25 years ago, 28-Nov-99, to lugnet.robotics.handyboard)
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| | Navigation with two Polaroid Sonars?
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What is a good meathod to implement navigation on a robot with two Polaroid sonars and basic two-motor steering? I was doing research and they use nueral networks and such, but I am not yet at the stage to implement something that complex. Thanks (...) (25 years ago, 27-Nov-99, to lugnet.robotics.handyboard)
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| | Interface to other displays
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Hi, Does anyone have info on replacing the LCD with another type of display? What I have in mind is an array of 5 X 7 LED displays. No sense reinventing the wheel if someone has already done this. TIA John (25 years ago, 27-Nov-99, to lugnet.robotics.handyboard)
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| | alphanumeric plasma display
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Hi, I got one alphanumeric plasma display 40 char X 8 lines made by industrial electronics engineers from a surplus store for $7.50. But i didn't have any litarature about this product. I tried to search for their web site but no luck. If any one (...) (25 years ago, 26-Nov-99, to lugnet.robotics.handyboard)
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| | Re: IC 3.X and Smooth PWM
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Yes it does. Look in the Handy_Board_1.2.icd file that came on your 3.x disc. That file specifies the .s19 pcode file to load and any other files to be loaded at startup of IC 3.x. You can either change those to some special name you have created (...) (25 years ago, 26-Nov-99, to lugnet.robotics.handyboard)
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| | IC 3.X and Smooth PWM
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Does IC 3.X support smooth PWM? (25 years ago, 26-Nov-99, to lugnet.robotics.handyboard)
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| | Re: motor driver circuit -- help needed
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Hi, my name is nicolas and I'm a french student in an engineering school at LYON. I make a PCB with the L298N for the handy board. You must remove the L293D that you use for the motor 0 and 1. You put a connector in the socket 16 pin and this (...) (25 years ago, 25-Nov-99, to lugnet.robotics.handyboard)
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| | motor driver circuit -- help needed
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Hi , I am trying to drive two DC motors of 12v, 2A rating for my robot base. I am looking for the ready-made motor drivers for this. Please sujust me if you guys have any products known. i found one in the web , help me in deciding whether this is (...) (25 years ago, 25-Nov-99, to lugnet.robotics.handyboard)
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| | Re: HandyBoard not responding
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Hi, Finally I found out what happened. One of the pins of the RJ-11 socket on the handyboard was disconnected from the PCB. So I soldered it back and the handyboard is working fine. Thanks for all your help. Kalyan (...) (25 years ago, 25-Nov-99, to lugnet.robotics.handyboard)
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| | Re: HandyBoard Charging
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Danny, Glad you've got it working! Gleason Research is a good company to do business with, isn't it? Good luck and have fun with your HB, - Nick - (...) (25 years ago, 25-Nov-99, to lugnet.robotics.handyboard)
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| | Re: robot project
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(...) Michael: You will not get your program to outrun light. The rf signal is moving at 300,000,000 m/s. If you divide the space between your antennas by 300,000,000 you will get the time difference for the rf arrival time. I believe you will find (...) (25 years ago, 25-Nov-99, to lugnet.robotics.handyboard)
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| | Re: robot project
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Mike, Don't think it's going to work. 186,000 miles per second is almost 1,000,000,000 feet per second ... so if your receiver antennas are 12 inches apart the time difference of the received pulse will be 0.001 microseconds maximum ... way too (...) (25 years ago, 25-Nov-99, to lugnet.robotics.handyboard)
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| | robot project
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Hi, I’m trying to get a robot to turn a face the owner using rf. I have one transmitter (that the owner will wear) and three receivers (set up in a triangle). We want to use the transmitter as a beacon. Then whichever receiver gets the signal first, (...) (25 years ago, 25-Nov-99, to lugnet.robotics.handyboard)
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| | Re: Video Transmitters
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I received the X-10 cam I ordered two days ago. It arrived right on time, and is pretty impressive for less than $100 including California sales tax. Plus they sent me this gizmo that you plug into the back of your computer, with a couple of (...) (25 years ago, 24-Nov-99, to lugnet.robotics.handyboard)
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| | Re: IR Sensors
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(...) Didn't I post that to the handyboard list? I don't remember sending to the SRS. For some reason, I get alot of "user-not-found" error messages when I send an email to the handyboard mailing list. Do I have the old address? I was using (...) (25 years ago, 24-Nov-99, to lugnet.robotics.handyboard)
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| | IR unit
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I'm curious if there is any difficulty using the IS1U621/IS1U621L in place of the IS1U60. I notice they recommend an additional cap on the leads and I'm wondering if this is any problem? Regards, Jim Munro <jimmn@xnet.com> (25 years ago, 24-Nov-99, to lugnet.robotics.handyboard)
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| | Re: HandyBoard not responding
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Kalyan, The gray squares on the LCD simply mean that the HB doesn't have its pcode program loaded. So it doesn't indicate a hardware failure. With Window 2K, were you able to open "Direct to COM1" using HyperTerminal? If no, this definitely (...) (25 years ago, 24-Nov-99, to lugnet.robotics.handyboard)
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| | RE: HandyBoard not responding
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Hi, I tried to download the pcode under Windows 2000 , but I got the same error. So the problem is not with the COM port, must be something else. When I switch the handyboard on I see squares on the first line of the LCD. Thanks Kalyan -----Original (...) (25 years ago, 24-Nov-99, to lugnet.robotics.handyboard)
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| | Five hc374 Latch Selects for digital outs
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Hello everyone... I hav already connected a hc374 to Y0 of the expansion bus to get 8 digital outs, It works gr8. I need anouther 32 outputs which meens I need 4 more latch selects. Can I use Y1, Y2, Y3, Y4, and Y5 if needed? Y0 is used by (...) (25 years ago, 24-Nov-99, to lugnet.robotics.handyboard)
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| | Re: Flame sensors?
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Hi, We had very good luck in last years Trinity College contest with some cheap IR Photo transistors. We got some DIGI-KEY QSD422QT-ND photo transistors and found they gave us very good discrimination even at 4 feet away (which was the maximum range (...) (25 years ago, 23-Nov-99, to lugnet.robotics.handyboard)
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| | Re: Flame sensors?
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Acroname has a pyroelectric sensor that is specifically designed to sense heat sources: (URL) Will +---...---+ | ^^ <^ ^> | | / òó ó°° \ | | / =Y= U \ | | Wendy, Will, Tatoosh & Tenzing | +---...---+ I went straight from shenanigans to crimes (...) (25 years ago, 23-Nov-99, to lugnet.robotics.handyboard)
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| | Larger Display
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Hi, I need a display larger than one on the HB so it can be legible for a crowd 25 - 30 feet away. Ideally I could plug it into HB in place of the existing LCD but I can adapt if necessary. Any suggestions? TIA John (25 years ago, 23-Nov-99, to lugnet.robotics.handyboard)
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| | Re: com1 port settings to download pcode.hb.s19
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I did the test in the hyperTerminal and i couldn't get the com1 port. Do you know how can i enable this port in windows nt? (...) don't (...) don't (...) i (...) (25 years ago, 23-Nov-99, to lugnet.robotics.handyboard)
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| | Re: Just a couple of quick questions...
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(...) Thanks Nick. Although I guess I was hoping for a more prepackaged solution... especially with regards to the LEGO plastic enclosure. Has anybody ever thought of actually making them as a commercial product? I certainly can't be the only person (...) (25 years ago, 23-Nov-99, to lugnet.robotics.handyboard)
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| | Re: Flame sensors?
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supposedly UV sensors are capable of detecting flames well. But I simply take the Sharp infrared reflective sensors and just use the detector. -p (...) (25 years ago, 23-Nov-99, to lugnet.robotics.handyboard)
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| | Flame sensors?
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I would like to do a fire-fighting competition next semester in our LEGO class (like Trinity college, though much smaller scale). What kind of sensors are useful with the Handy Board for detecting flames? Thanks. --greg ***...*** * Greg Starr, (...) (25 years ago, 18-Nov-99, to lugnet.robotics.handyboard)
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| | Sensor to detect flame?
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I am considering doing a LEGO competition for next semester in which the robots have to find and extinguish a flame (candle, for ex.) Like the Trinity College contest, I guess. What sensors can be used to detect a flame? I always like to try to get (...) (25 years ago, 22-Nov-99, to lugnet.robotics.handyboard)
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| | Re: Just a couple of quick questions...
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Mark, The answer to both is YES. Remove the four screws from the corners of the HB and remove the board and batteries from the plastic box. Cut the battery wires and add a polarized two wire connector. Then you are able to substitute any desired (...) (25 years ago, 22-Nov-99, to lugnet.robotics.handyboard)
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| | Just a couple of quick questions...
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1) Is there a lego-ish plastic enclosure available for the handyboard (preferable expansion board capable)? 2) Is there a Li-Ion battery alternative to the NiCad batteries? Thanks (...) (25 years ago, 22-Nov-99, to lugnet.robotics.handyboard)
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| | RE: HandyBoard not responding
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Yes ,last week I installed other software which used com port , but I unstalled that software later. I will try disabling and then enabling the com port. Thanks Kalyan -----Original Message----- From: Nick Taylor [mailto:ntaylor@iname.com] Sent: (...) (25 years ago, 22-Nov-99, to lugnet.robotics.handyboard)
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| | Re: HandyBoard not responding
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Kalyan, During the two weeks that you didn't use your HB did you install any software that uses _any_ serial port? When I installed Windows CE Services it interfered with serial I/O. To talk to other serial devices on com1 it's necessary to disable (...) (25 years ago, 22-Nov-99, to lugnet.robotics.handyboard)
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| | Re: HandyBoard not responding
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it sounds like it's a problem with your downloader configurations -- neither of them can open the COM port. were you able to connect "Direct to COM1" with HyperTerminal when doing the Windows Serial Debug? it's odd that that would work and then the (...) (25 years ago, 22-Nov-99, to lugnet.robotics.handyboard)
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| | HandyBoard not responding
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Hi, I left the HandyBoard without power for 2 weeks ,and now I am not able to download anything to it. When I try using HBDL.exe to download pcode_hb.s19 I get the errror "Wrong port or Board mode.". I am using the 12VDC adapter connected directly (...) (25 years ago, 22-Nov-99, to lugnet.robotics.handyboard)
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| | Re: com1 port settings to download pcode.hb.s19
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I think the IRQ is not ok. ----- Original Message ----- From: lourdes Costa <loucosta@earthlink.net> To: <handyboard@media.mit.edu> Sent: Sunday, November 21, 1999 6:34 PM Subject: com1 port settings to download pcode.hb.s19 (...) trying (...) don't (...) (25 years ago, 21-Nov-99, to lugnet.robotics.handyboard)
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| | Re: com1 port settings to download pcode.hb.s19
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go to start->settings->control panel->ports and see if COM1 is available, if not then use the the com port that is listed there, if there is nothing there then there is something wrong. Also make sure any background apps aren't using the com port. (...) (25 years ago, 21-Nov-99, to lugnet.robotics.handyboard)
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| | Re: com1 port settings to download pcode.hb.s19
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did you try the Windows Serial Debug instructions, at (URL) will at least tell you if the serial port is working at all. if you don't see the "Direct to COM1" setting available in HyperTerminal, then Windows doesn't believe you have a serial port at (...) (25 years ago, 21-Nov-99, to lugnet.robotics.handyboard)
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| | com1 port settings to download pcode.hb.s19
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Hi, I am here struggling to connect the handyboard with my computer. I am trying download pcode.hb.s19 In com1 port, but i am receiving a message that it can't open the port. I think that the settings of my com1 port is wrong. They are: Band rate = (...) (25 years ago, 21-Nov-99, to lugnet.robotics.handyboard)
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| | IR detection
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hey does anybody know how an IR sensor card works? -- Dovi Poznanski dovip@post.tau.ac.il 22 Israel's st. Tel Aviv tel: 03 5229643 (25 years ago, 21-Nov-99, to lugnet.robotics.handyboard)
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| | Re: Nicad Problems
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(...) Hi My name is Marco and I am not interested to handyboard, but I have a lot of experience with NiCd battery. Whitout more precise data and history of your NiCd cell pack, the highest probability to have a reversal in the polarity is due to a (...) (25 years ago, 20-Nov-99, to lugnet.robotics.handyboard)
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| | Nicad Problems
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Hi Ive been having problems with my batteries for my handyboard lately so I took them out to check them all. All the batteries checked out fine except for one, which had something very wrong with it - the terminals were reversed! So when I measured (...) (25 years ago, 20-Nov-99, to lugnet.robotics.handyboard)
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| | Re: Video Transmitters
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(...) And the X-10 color camera is going for $99 (actually its $88 today) and it also includes a xmit/recieve pair that I found runs nicely off batteries. The color camera is the cool bit since it is the "lipstick" type and light enough to put on an (...) (25 years ago, 20-Nov-99, to lugnet.robotics.handyboard)
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| | Re: HB bootstrap mode problem, LCD problem, please help
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Dr. Martin responded to your earlier post a few hours ago. Have you tried what he suggested? (...) (25 years ago, 19-Nov-99, to lugnet.robotics.handyboard)
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| | HB bootstrap mode problem, LCD problem, please help
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Hi guys, i have a problem with the HB boot strap mode. symptoms.... I tried to connect the LCD and HB with a long ribbon cable. And it worked fine , and i am trying to put this in a box and switched on the power and tried to load the pcode. But my (...) (25 years ago, 19-Nov-99, to lugnet.robotics.handyboard)
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| | [OT] speech recognition
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The December '99 issue of "Popular Electronics" has the first part of a two part article on the HM2007 speech recognition chip ... pretty cool if your robot can understand voice commands. - Nick - (25 years ago, 19-Nov-99, to lugnet.robotics.handyboard)
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| | Re: need help in trouble shooting hb bootstrap mode
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try doing the download with the LCD disconnected. use the pcode that doesn't need the LCD to work: (URL) if that works, you may have miswired or damaged the LCD. did it ever work after you made the modifications? fred In your message you said: (...) (25 years ago, 19-Nov-99, to lugnet.robotics.handyboard)
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| | need help in trouble shooting hb bootstrap mode
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Hi guys, i have a problem with the HB boot strap mode. symptoms.... I tried to connect the LCD and HB with a long ribbon cable. And it worked fine , and i am trying to put this in a box and switched on the power and tried to load the pcode. But my (...) (25 years ago, 19-Nov-99, to lugnet.robotics.handyboard)
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| | Re: Compiling pcode for the handyboard
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Had the some prob. We had to make sure the included header files, etc. had the correct path in the sources. (...) (25 years ago, 18-Nov-99, to lugnet.robotics.handyboard)
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| | Compiling pcode for the handyboard
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I downloaded the pcode_pc environment for the PC and have been able to set up and compile it, but nothing I compile works when I download it. The included readme file did not give the compiler toggles for a standard Handyboard rev 1.2 What is meant (...) (25 years ago, 17-Nov-99, to lugnet.robotics.handyboard)
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| | LEGO sensor inputs - Basic question
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Hi, What does 'ACTIVE' mean in LEGO active sensor inputs on the Expansion board? Can I attach a LEGO light sensor ? Thanks Kalyan Kalyan Mulampaka Software Engineer e Information Services ___...___ Ph#: (770) 698 4436 (O) (678) 320 0783 (R) (25 years ago, 17-Nov-99, to lugnet.robotics.handyboard)
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| | RE: Hacking the 3com Palm
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Hi, Try the 3com palm web site (URL) in the Palm Solution Provider program to access the source code and other utilities of Palm OS. Kalyan -----Original Message----- From: Jose-Alfredo D. Esguerra [mailto:trek@wwnet.com] Sent: Wednesday, November (...) (25 years ago, 17-Nov-99, to lugnet.robotics.handyboard)
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| | Hacking the 3com Palm
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Hello, Does anyone know of a websites with some examples on hacking the Palm? Jose (25 years ago, 17-Nov-99, to lugnet.robotics.handyboard)
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| | Re: evaluate inverse cosine, sine in IC
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(...) to get a better approximation use: arcsin(x) = pi/2 - sqrt(1 - x)(a0 + a1*x + a2*x^2 + a3*x^3), where a0 = 1.5707288 a1 = -0.2121144 a2 = 0.0742610 a3 = -0.0187293 (25 years ago, 17-Nov-99, to lugnet.robotics.handyboard)
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| | Re: IRPD
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(...) [snip] Hey Nick! Heck, I'd be interested in how you made the noise rejection even better! That is the part I spent the most time on! DLC (25 years ago, 16-Nov-99, to lugnet.robotics.handyboard)
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| | Re: HandyBoard Charging
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Danny ... does your HB work when it is NOT connected to the serial board or the charger? - Nick - (...) (25 years ago, 16-Nov-99, to lugnet.robotics.handyboard)
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| | Connect HP 48GX
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Hi Did somebody ever try to connect the Handy-Board to a Hewlett Packard 48G or 48GX? I don't exactly know the specifications of the serial port of the 48G. But there are several serial options possible. For example the protocol can be Kermit or (...) (25 years ago, 16-Nov-99, to lugnet.robotics.handyboard)
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| | Re: IRPD
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Kalyan, Both Marvin Green and Dennis Clark have IRPD kits (fairly cheap) that IMO are much better than the Lynxmotion unit (I have all three). (2 URLs) you get either Marvin's or Dennis' IRPD kit, I can send you PIC source code for either board that (...) (25 years ago, 16-Nov-99, to lugnet.robotics.handyboard)
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| | Re: IRPD
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(...) I have a PIC based design on my web page: (URL) that will work with any micro. I have parts description and PIC source as well as a crude board layout graphic. This one is fully automated with a left/right/both sensing capability. I also have (...) (25 years ago, 16-Nov-99, to lugnet.robotics.handyboard)
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| | Re: IRPD
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If you check (URL) you will find IRPD's with very narrow detection zones. Those are good for many applications. If you need one with wide coverage just for obstacle avoidance, check (URL) One or the other of those sites should work for you. Gary (...) (25 years ago, 16-Nov-99, to lugnet.robotics.handyboard)
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| | Re: HandyBoard Charging
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no, to do the battery run-down test, you must not have it plugged in! otherwise you'd just be powering it from the adapter, and you'd never run out of juice. so, the steps are: 1. bootload your HB with pcode_hb.s19. you should see the Interactive C (...) (25 years ago, 16-Nov-99, to lugnet.robotics.handyboard)
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| | Re: HandyBoard Charging
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Okay, I'll try it. Do I need to have the DC adapter plugged in to the (...) th (...) the (...) bei (...) pow (...) off (...) a (...) (25 years ago, 16-Nov-99, to lugnet.robotics.handyboard)
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| | Re: HandyBoard Charging
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Danny, Since you imply that your battery does not take any charge at all, it sounds to me as though your problem is: (1) fuse F1 is open, or (2) a cell in your battery pack is open, or (3) one of the battery wires or its associated PCB land is open. (...) (25 years ago, 16-Nov-99, to lugnet.robotics.handyboard)
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| | IRPD
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Hi, Can somebody point me some web pages for an Infrared Proximity Detector/sensor (IRPD) for the HandyBoard? Thanks Kalyan Kalyan Mulampaka Software Engineer e Information Services ___...___ Ph#: (770) 698 4436 (O) (678) 320 0783 (R) (25 years ago, 16-Nov-99, to lugnet.robotics.handyboard)
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| | Re: HandyBoard Charging
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ok, you have the stock adapter. like i said, sometimes the batt does get fully charged and then not enough current flows in trickle-charge to light the LED. but that's normal, so it doesn't sound like there is actually a problem. a simple way to (...) (25 years ago, 16-Nov-99, to lugnet.robotics.handyboard)
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| | Re: HandyBoard Charging
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Well I bought an assembled board from Gleason Research and I've been using the DC adapter that came with the board. The charging leds light up only when the Handyboard on? Is there something special I need to do to run the board on batteries? Is (...) (25 years ago, 16-Nov-99, to lugnet.robotics.handyboard)
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| | Re: HandyBoard Charging
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do you have the recommended 12v, 500 ma DC adapter? if not, that explains it. if so, sometimes when the batt is fully charged, you don't get much in trickle charge mode and the light is off. but usually you should see the light being lit dimly. are (...) (25 years ago, 16-Nov-99, to lugnet.robotics.handyboard)
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| | HandyBoard Charging
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In the Handyboard manual it says when charging in trickle mode you should turn the Handyboard off, however when I do try and turn the Handyboard off the charge light on the serial/charger board goes off? Is the board still being charged or is there (...) (25 years ago, 16-Nov-99, to lugnet.robotics.handyboard)
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| | Re: evaluate inverse cosine, sine in IC
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(...) The most efficient way to do it is to use Taylor Series approximations of the functions. Decide how much precision you need, and then write functions that evaluate the first few terms in the appropriate series. Usually, a series will converge (...) (25 years ago, 16-Nov-99, to lugnet.robotics.handyboard)
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| | evaluate inverse cosine, sine in IC
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Hi, is there a way to evaluate inverse cosine and sine using IC? Thx (25 years ago, 15-Nov-99, to lugnet.robotics.handyboard)
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| | Re: Video Transmitters
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(...) I't not that cheap, but if you want small size and low power consumption check out this 900 Mhz transmitter/receiver pair from supercircuits: (2 URLs) here's a very small camera with transmitter built in: (URL) if you want to receive on a (...) (25 years ago, 15-Nov-99, to lugnet.robotics.handyboard)
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| | Re: Video Transmitters from JDR
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[glashan] spake unto the ether: (...) From the fancy TV receiver you describe, I'd say you wouldn't have to do anything but select NTSC mode. The kit is supposed to transmit over the range of VHF channels 3-7, but my specific kit only does 3-5 (why (...) (25 years ago, 14-Nov-99, to lugnet.robotics.handyboard)
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| | Re: Video Transmitters
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NetMarket (www.netmarket.com) carries a transmit/receive pair made by Recoton. It's intended to transmit audio/video around the house. Ours includes a gizmo to extend your remote control capabilities, and it cost about $120. Just the (...) (25 years ago, 14-Nov-99, to lugnet.robotics.handyboard)
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| | Re: mixing variable types in IC
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[Ben Davis] spake unto the ether: (...) Hmm, I think you want c = ((float)(x))/((float)(y)); Otherwise, the division will be done first as integers, giving an integer quotient, which you're then turning into a float. *Rich* (25 years ago, 14-Nov-99, to lugnet.robotics.handyboard)
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| | mixing variable types in IC
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Hi John- You can convert quantities from one data type to another (it's called "casting", I believe). The following computes the quantity x/y, then converts it to a float: ---...--- int x, y; float c; float divide ( int x, int y) { c = (float) (...) (25 years ago, 14-Nov-99, to lugnet.robotics.handyboard)
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| | mixing variable types in IC
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Now that I got past my nested function problem I have discovered that IC does not like mixing variable types. For instance, this results in an error: int x, y; float c; float divide ( int x, int y) { c = (x/y); return c; } IC will not let me (...) (25 years ago, 14-Nov-99, to lugnet.robotics.handyboard)
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| | Re: Video Transmitters
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[glashan] spake unto the ether: (...) JDR Microdevices ((URL) sells a $25 short-range VHF TV transmitter kit. It's all analog, so there is some drift with warmup and it needs a very stable power supply, but otherwise it works great. The observer (...) (25 years ago, 14-Nov-99, to lugnet.robotics.handyboard)
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| | Video Transmitters
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Hi all I wonder if anyone out there can help me with this: Im looking for a cheap video transmitter or circuit diagram. Ive got a small board camera on my bot and I need to find some way of sending the video to my TV. I dont want to go out and spend (...) (25 years ago, 14-Nov-99, to lugnet.robotics.handyboard)
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| | Re: IC trouble - function definition - understand now, Thanks
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Sorry, Forgot to enclose the code. what is wrong here? long time; void phony() { while (digital(2) == 1) { time = mseconds(); printf("%d\n", mseconds()); } if (mseconds () >1413 ) fd(1); else bk(1); } void start() { phony(); } void main() { while(1) (...) (25 years ago, 13-Nov-99, to lugnet.robotics.handyboard)
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| | Re: IC trouble - function definition - understand now, Thanks
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John, Have been following your problems with function definition. what is wrong with this code? It will print the mseconds but the if statement does not work. Thanks Terry -----Original Message----- From: John Bachman <bachman@anatek.mv.com> To: (...) (25 years ago, 13-Nov-99, to lugnet.robotics.handyboard)
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| | Re: IC trouble - function definition - understand now, Thanks
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Rich got it. Nested functions was the problem. I don't recall seeing that discussed in the IC manual and I think it is OK in C. Nonetheless, thanks to all for helping this hapless programmer. John (...) (25 years ago, 13-Nov-99, to lugnet.robotics.handyboard)
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| | Re: IC trouble - function definition
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(...) whoa! Local function definitions. Even GCC doesn't grok that. Try extracting the function definition phony() from start() like so: long time; void phony() { while (digital(2) == 1) { time = mseconds(); } } void start() { phony(); } -d (...) (25 years ago, 13-Nov-99, to lugnet.robotics.handyboard)
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| | Re: IC trouble - function definition
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[John Bachman] spake unto the ether: (...) You have the definition of phony() nested inside the definition of start(). I don't know what ANSI C and/or C++ let you do, but this is invalid IC. You need something like: long time; void start() { (...) (25 years ago, 13-Nov-99, to lugnet.robotics.handyboard)
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| | Re: IC trouble - function definition
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Thanks for all the helpful device but the darned thing still does not work. I have created a simplified program to try to figure out what I am doing wrong. Here it is: /* A simplified program to figure out what is wrong */ long time; void start() { (...) (25 years ago, 13-Nov-99, to lugnet.robotics.handyboard)
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| | Re: IC trouble - function definition
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John: If your function does not need a parameter passed to it just do: void detect_time2() { /* code here */ } just like int main() { /* code here */ } Bart. ___...___ Reply Separator ___...___ Subject: IC trouble - function definition Author: (...) (25 years ago, 12-Nov-99, to lugnet.robotics.handyboard)
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| | Re: IC trouble - function definition
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John: Try it like this----- void detect_time_2() {same code here;} IC is a lot like ANSI C, but there are some differences. Good luck, Gary Livick (...) (25 years ago, 12-Nov-99, to lugnet.robotics.handyboard)
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| | IC trouble - function definition
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I am having trouble with function definitions. Can someone tell me what is wrong with this: void detect_time_2 (void) { code here;} I get a syntax error on the definition line and cannot figure out why. TIA John (25 years ago, 12-Nov-99, to lugnet.robotics.handyboard)
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| | RE: pneumatics and compressed air cartridges
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check (URL) Look under spare parts for Pneumatic products Kalyan -----Original Message----- From: Chen Yung Hsu [mailto:hsu3@cooper.edu] Sent: Thursday, November 11, 1999 4:23 PM To: handyboard@media.mit.edu Subject: Re: pneumatics and compressed (...) (25 years ago, 12-Nov-99, to lugnet.robotics.handyboard)
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| | Re: pneumatics and compressed air cartridges
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You may find some help by joining the legged robot email list. There have been several discussions on this topic. Send an email to: legged-robots-subscr...groups.com and it will send you information and instructions to join. Then simply send your (...) (25 years ago, 12-Nov-99, to lugnet.robotics.handyboard)
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| | Re: pneumatics and compressed air cartridges
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Chen, I just received catalogs from Clippard Minimatic Co. Looks like just what you are looking for. http//www.clippard.com bye Terry -----Original Message----- From: Chen Yung Hsu <hsu3@cooper.edu> To: handyboard@media.mit.edu (...) (25 years ago, 12-Nov-99, to lugnet.robotics.handyboard)
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| | Robot for sale
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I have a General Robotics RB5X I'd like to sale for $1000, it was just refurbished by General Robotics a year ago at a costs of $1200. I know this doesn't have anything to do with Hand Boards but I thought maybe someone from the mailing list would (...) (25 years ago, 12-Nov-99, to lugnet.robotics.handyboard)
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| | Re: pneumatics and compressed air cartridges
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Hi! I was wondering if anyone can help me. I'm looking for light weight, miniature pneumatic actuators, solenoid valves, and compressed air cartridges. Does anyone know any companies that sell these? Also, does anyone have any experience utilizing (...) (25 years ago, 11-Nov-99, to lugnet.robotics.handyboard)
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