 | | 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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