 | | motor current trick
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I've got a great R/C track vehicle that I want to use as a robot chassis, problem is the 1 Amp motors. I was going to use Kam's suggestion, but then I saw the Sonar schematics. I noticed that the sonar schematics have power coming from the motor (...) (25 years ago, 27-Oct-99, to lugnet.robotics.handyboard)
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| | Re: Sharp GP2D02 with out expansion board
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Gary, Cool! Could you tell me how you wired it up? I'm a real beginner here and don't know exactly what you mean on that web page by: "This example assumes that port PA5 on the Handy Board was connected to the input of the GP2D02 detector and that (...) (25 years ago, 27-Oct-99, to lugnet.robotics.handyboard)
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| | Re: MOTOR DRIVERS
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I also remember seeing people piggybacking the L293s to double the current capability. Thoughts? -chris ----- Original Message ----- From: Fred G. Martin <fredm@media.mit.edu> To: <handyboard@media.mit.edu> Sent: Monday, October 25, 1999 2:26 PM (...) (25 years ago, 26-Oct-99, to lugnet.robotics.handyboard)
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| | line-followers
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Hi all, I would greatly appreciate information on line-followers and oscillating DC wire-followers to use with the Handy Board. Which models are the most practical? Where can I find the specs and instructions for these models? What is the code for (...) (25 years ago, 26-Oct-99, to lugnet.robotics.handyboard)
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| | 64K UPGRADE
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When upgrading to 64K, could that be done when still using Interactive C? By the way, what's the main difference between 2.8 and 3.X versions? Advantanges and Disavantages!!! Thanks, Paul (25 years ago, 26-Oct-99, to lugnet.robotics.handyboard)
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| | Eltec 442 Pyroelectric Sensor
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Hi, I purchased an Eltec 442-3 Pyroelectric Sensor from acroname. I know pin 1 is V+ 5V but I don't know how I should connect pin 2,3,4 to my handy bord/expansion board. I want to use the sensor for detecting people and/or candles. How do I connect (...) (25 years ago, 26-Oct-99, to lugnet.robotics.handyboard)
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| | Re: fried memory
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it might not be permanently dead, but if it's not, it's not working. one (or more) of the outputs of these two chips is probably shorted to ground or shorted to +5v. the chips get hot when they try to drive this output to a state other than the one (...) (25 years ago, 26-Oct-99, to lugnet.robotics.handyboard)
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| | fried memory
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I suspect that I fried my memory chip. The handyboard downloads Pcode perfectly, but when it tries to synchronize with interactive C, I get an error. While the board is off the 62256-12LP and the 74HC132 chips stay hot. is there a good diagnostic (...) (25 years ago, 26-Oct-99, to lugnet.robotics.handyboard)
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| | Expansion Board and Smooth PWM
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I really need to know how to get all my files correct to run both the expansion board and the smooth PWM routines at the same time. I downloaded both zip files but am unsure which files to use. Did I miss something on the web page where it says how (...) (25 years ago, 26-Oct-99, to lugnet.robotics.handyboard)
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| | Re: MOTOR DRIVERS
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(...) Hi Paul, I don't know how the handyboard is protected against overload but one thing is for sure : if you overload the driver chip ... this one will fry up.In worst case you'll fry the board as well. If a driver chip's maximum current is 1 (...) (25 years ago, 25-Oct-99, to lugnet.robotics.handyboard)
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| | Re: MOTOR DRIVERS
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It won't necessarily fry the chip. L293s (and the TI equivalent) have a thermal protection mode. If the chip gets too hot, it will turn itself off. Most of the time, this protects the chip against over-current. However, it is still possible to fry (...) (25 years ago, 25-Oct-99, to lugnet.robotics.handyboard)
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| | Re: MOTOR DRIVERS
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(...) Hi Paul, I think it would take out the chip, but I am currently doing this by installing a oversize heatsink & fan to the controller chip and pulsing the motor instead of constant current. Exceeding the max current capacity but, limiting (...) (25 years ago, 25-Oct-99, to lugnet.robotics.handyboard)
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| | Re: MOTOR DRIVERS
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Answer it'll fry the chip Question? Why would you even want to do that? (...) (25 years ago, 25-Oct-99, to lugnet.robotics.handyboard)
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| | MOTOR DRIVERS
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Question? When using a motor which will exceed the driver chip max current, will that fry the chip or the handy board? Paul (25 years ago, 25-Oct-99, to lugnet.robotics.handyboard)
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| | Compiler Errors keep my board from loading
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Help!! I don't know how to fix compiler errors! Specifically, I received the following error: "Compiler error! 47 extra bytes left on board stack. " and I don't know how to fix it. I do know that I cannot load programs on my board until I fix the (...) (25 years ago, 25-Oct-99, to lugnet.robotics.handyboard)
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| | Re: What can I do with a robot?
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Adam, As far as interfacing to external devices, the inexpensive ones are wheel encoders, IR ranging, bumpers, sound sensors and visible light sensors. You can get much more involved by adding compasses, GPS, video vision and so on, but the cost (...) (25 years ago, 25-Oct-99, to lugnet.robotics.handyboard)
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| | What can I do with a robot?
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A question for all of you fantastic robotics enthusiasts out there: I have to do a final year project next year, and I'm getting a head start on designing it. I've been told that I can do pretty much what I like with a robot, as long as it has a lot (...) (25 years ago, 25-Oct-99, to lugnet.robotics.handyboard)
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| | Re: Analog port shaft encoder
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Rob, I use these same encoders just as you do, and they work fine. However, the spacing of the encoders from thier targets is important for proper function. 1.5 to 2 mm works well for me. In addition, I have had to play with the encoder high (...) (25 years ago, 25-Oct-99, to lugnet.robotics.handyboard)
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| | Re: HC11 pink book
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Adam, Here are three books for your MCU: M68HC11RM/AD is the M68HC11 Reference Manual M68HC11A8/D is the M68HC11A8 Technical Data book M68HC11A8RG/AD is the M68HC11A8 Programming Reference Guide They are available at: (URL) this helps, - Nick - (...) (25 years ago, 25-Oct-99, to lugnet.robotics.handyboard)
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| | How do I connect 100 photocells to my handyboard?
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Hi, For a project I'm working on, I need to track the output of one hundred (100) photocells. I don't need great accuracy on any of them, but maybe a ten-step resolution at the most. Is there a relatively standard or well-known method to gather (...) (25 years ago, 25-Oct-99, to lugnet.robotics.handyboard)
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| | reading sensor input?
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I've got a strange problem that probably has an easy solution, but I've been trying to hard to figure it out and am afraid that now I'm missing the obvious. I brushed the dust off my Handy Board to build a robot for my middles school robotics (...) (25 years ago, 24-Oct-99, to lugnet.robotics.handyboard)
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| | Anybody's French ?
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Hi all! As I plan to build a Handy Bord, and as I am a bit far away from USA, I just would like to know if there is anyone living in France (and maybe in/near Paris?)... Electronic components aren't really cheap here, so if I could share tips about (...) (25 years ago, 23-Oct-99, to lugnet.robotics.handyboard)
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| | Re: Analog port shaft encoder
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Tried what you said Joshua, I went through all the analog ports and manually fed them with a TTL signal from a function generator at a relatively low frequency of 5Hz and wrote this little test code to test it. In this example, the sencdr3.icb has (...) (25 years ago, 23-Oct-99, to lugnet.robotics.handyboard)
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| | Re: Analog port shaft encoder
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Rob, Another suggestion for debuging your setup would be to write a program which; 1, anually counts the pulses from the encoder, and writes them to the lcd screen; or 2, Just writes the state of the encoder input to the screen (a 1 or 0). Then you (...) (25 years ago, 23-Oct-99, to lugnet.robotics.handyboard)
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| | Analog port shaft encoder
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Hi, I am having great difficulty trying to get my shaft encoder to work using both sencdr3.icb or fencdr3.icb driver. I am using the QRB1114 optical sensor connected to analog port 3 with a current limiting resistor of 330 ohms for the emmiter and (...) (25 years ago, 22-Oct-99, to lugnet.robotics.handyboard)
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| | Re: HC11 pink book
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Adam: The pink book part number from Motorola is: M68HC11RM/AD this is the general reference manual for the whole family of microcontrollers, there is also a technical data manual with P/N: MC68HC11A8/D this one just covers the A series processors. (...) (25 years ago, 21-Oct-99, to lugnet.robotics.handyboard)
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| | HC11 pink book
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Hi, I've seen this referenced, and grabbed the link that someone provided the other day. I've had a look at all the different manuals listed, but I can' work out which is the right one to grab. My handyboard has the 68HC11A1FN part number. Can (...) (25 years ago, 21-Oct-99, to lugnet.robotics.handyboard)
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| | Re: GLOBAL POSITIONING SYSTEM
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(...) Yes, I have done it, perhaps others. I use mine nearly every day connected to a GPS, but it has nothing to do with robotics. You're a bit off on your accuracy though, the spec actually says you'll be within 100 meters 95% of the time. I think (...) (25 years ago, 21-Oct-99, to lugnet.robotics.handyboard)
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| | Re: Vector 2X problem
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Hi, finally my Vector2X works! Just because of the wrong selection of transistor. Guide comes from Tom Brusehaver (1997). Thanks! Any way, the result seems not consistense as the heading 'hang' when I turn off the HB and on again later. Instead of (...) (25 years ago, 21-Oct-99, to lugnet.robotics.handyboard)
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| | Expansion board - SPI
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Hi ... If I fit an expansion board will I lose access to the SPI port ? ... Richard Spooner (25 years ago, 21-Oct-99, to lugnet.robotics.handyboard)
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| | sony ir function
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I would like to know why the sony ir_data() only display 8 bit number instead of the 12 or 13 bit IR message? Does the number represent data only instead of the address or device? Does anybody knows how I could make the handyboard display the (...) (25 years ago, 21-Oct-99, to lugnet.robotics.handyboard)
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| | Re: for loop stack overflow
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owen, what's inside the loop. i don't see any probl with the for loop itself. fred In your message you said: (...) (25 years ago, 21-Oct-99, to lugnet.robotics.handyboard)
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| | Re: for loop stack overflow
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Owen, IC integers are signed 16-bit values ... - Nick - (...) (25 years ago, 21-Oct-99, to lugnet.robotics.handyboard)
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| | Encoder IO board
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Hi everybody I have an application where I need to read 4 encoders, I am looking for an accurate encoder reading IO board which can be connected to an IBM PC. I am also looking for the rotary encoders for that. Please if you can help me find the IO (...) (25 years ago, 21-Oct-99, to lugnet.robotics.handyboard)
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| | Re: Please I need help!
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(...) I saw a contributed design a while back (on the HB web site, I think) of a multiplexer for running multiple Polaroid transducers off of one Polaroid ranging module. It involved the use of a few transistors and such. The idea was to use extra (...) (25 years ago, 20-Oct-99, to lugnet.robotics.handyboard)
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| | for loop stack overflow
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THis may be a dumb question on my part, but we are getting stack overflows on for loops such as for(int i = 0;i<1000;i++){...} when using values over 100 or so. Is this an 8bit counter thing or something else? Thanks, Owen Popplestone (25 years ago, 20-Oct-99, to lugnet.robotics.handyboard)
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| | Re: Handyboard low voltage motor control
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Well, I went with separate h-bridge to maintain PWM and it turns out that even though the motors are geared down, they still don't have enough torque to haul around all the batteries. Looks like I'll stick with 9v motors... Thanks for the (...) (25 years ago, 20-Oct-99, to lugnet.robotics.handyboard)
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| | RE: port addresses
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This is the online ordering form for motorola literature (if you are looking for motorola manuals) (URL) Message----- From: SNESS@amcomp.com [mailto:SNESS@amcomp.com] Sent: Wednesday, October 20, 1999 10:27 AM To: jimmn@xnet.com; (...) (25 years ago, 20-Oct-99, to lugnet.robotics.handyboard)
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| | GLOBAL POSITIONING SYSTEM
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I learned that somebody has successfully connected GARMIN GPS to HB. If I am not wrong , this GPS is not be able to receive any signal in building. If this the case, GPS is only good for outdoor robotics. Another thing is about the accuracy of the (...) (25 years ago, 20-Oct-99, to lugnet.robotics.handyboard)
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| | Re: Vector 2x
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I know everyboard has been sucessfully connected vector 2x to hb. I try to do the same thing as per Tom Brusehaver guides. Connecting as below :- +5V (SPI) to VCC (vector2x) GND(SPI) to GND (vector2x) MISO(SPI) to SDI (vector2x) MOSI(SPI) to (...) (25 years ago, 20-Oct-99, to lugnet.robotics.handyboard)
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