 | | 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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