 | | Driving large motors with the Handyboard
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Hi. I'm kinda new at this. I was wondering if anyone can help me answer this question. If I wish to drive large motors with a Handyboard, I understand that I have to use an h-bridge. Will I need to know anything about PWM before attempting this (...) (29 years ago, 23-Mar-96, to lugnet.robotics.handyboard)
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| | Re: Resets
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I have a few suggestions, these are all things that I have seen before to help reduce noise from motors I think that the problem might be due to crap getting back to the power line... thereby causing the DS1233 to say, time to reset... - try a (...) (29 years ago, 23-Mar-96, to lugnet.robotics.handyboard)
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| | OC2 and OC3 outputs?
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Where on the v1.2 board do I tie into the OC2, OC3, and OC4 output lines? Is there a schematic which has all the I/O pins labeled? I need to use the OC lines to output pulse trains. Does the library software use these ports for the motor() commands? (...) (29 years ago, 23-Mar-96, to lugnet.robotics.handyboard)
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| | Re: Resets
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(...) I can't say that I have an explanation of why the motors would work at first and then cause problems later, but I can say that: Not all motors work with the Handy Board. In particular, motors that want to draw too much current (e.g., more than (...) (29 years ago, 22-Mar-96, to lugnet.robotics.handyboard)
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| | Analog semsor inputs.
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What is the range of detection of the analog sensors? Are there discreet detection levels that the hendyboard can recognize? (29 years ago, 22-Mar-96, to lugnet.robotics.handyboard)
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| | zener diodes
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Bad idea. A small difference in ref voltage will drive most of the current through one of the two. That's also why I believe that putting l293D in parallele is also a bad idea. In practice it seems that sometimes it works. It is just a bad design. (...) (29 years ago, 22-Mar-96, to lugnet.robotics.handyboard)
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| | zener diodes
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I'm trying to use zener diodes to regulate the voltage being supplied to some motors I'm using with the handy board. I'm curious, though, can zener diodes be placed in parallel to handle more current? My understanding of their properties isn't (...) (29 years ago, 21-Mar-96, to lugnet.robotics.handyboard)
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| | add to mailing list
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LS ``Please add me to the Handy Board mailing list'' Greetings, jluijk@xs4all.nl (29 years ago, 21-Mar-96, to lugnet.robotics.handyboard)
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| | Resets
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I traced my reset problem down to the fact that there is a ton of electrical noise in the chip power (+5V). The noise is there only when motors are running. After a minute or so of running the motors, I'll get a runtime error or the board will just (...) (29 years ago, 21-Mar-96, to lugnet.robotics.handyboard)
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| | RE: Motor control
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I would rather have use of the 0 to 8 range because many of the values in the 0 to 100 range simply fall into groups which give only 9 speeds. However, I do not support rewriting the IC code. Tom's suggestion, motor(1,value*14), is simple and meets (...) (29 years ago, 18-Mar-96, to lugnet.robotics.handyboard)
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| | Re: Servos w/ the handyboard?
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(...) Yes. Just use the "servo.icb" and "servo.c" libraries that are distributed with Interactive C. This will convert the Handy Board's digital input 9 sensor (which is really a bidirectional counter/timer pin) into a stable servo control line. You (...) (29 years ago, 18-Mar-96, to lugnet.robotics.handyboard)
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| | address for RWI
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Try "jadietsch@activmedia.com" or "bkennedy@activmedia.com" -- Randy (...) (29 years ago, 18-Mar-96, to lugnet.robotics.handyboard)
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| | Re: Motor control
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(...) <snip> (...) It would make more sense to just use motor(1,speed*14) This would give you the following: Value --> Speed 0 --> 0 1 --> 14 2 --> 28 3 --> 42 4 --> 56 5 --> 70 6 --> 84 7 --> 98 I wouldn't bother rewriting the routine. Tom (29 years ago, 18-Mar-96, to lugnet.robotics.handyboard)
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| | Re: Motor control
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(...) Depends on how far you wish IC to go. Someday there could be another controller that allows 100 disrete levels. On the other hand that could be handled well by allowing the value to go to 100, and the code written to go to 8 would be kinda (...) (29 years ago, 18-Mar-96, to lugnet.robotics.handyboard)
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| | Re: Motor control
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I like 0 to 8 better. Also is there any way to control the frequency at which the PWM works? I find that some of my motors deliver too much at step 1. How about if there was something like: motor( motornum, cycles_on, total_cyles); if you feed (...) (29 years ago, 18-Mar-96, to lugnet.robotics.handyboard)
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| | speed control encapsulation
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(...) This is the reason I remember for encapsulating the value. It wouldn't be hard to implement new speed control for the 6811 either which could do better than 9 divisions. One option is to leave the encapuslated interface, but make more (...) (29 years ago, 18-Mar-96, to lugnet.robotics.handyboard)
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| | Re: Resets
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(...) Well that would do it---it would discharge your battery. You actually should be getting more like 9.6 to 10v from a fully charged battery. Why don't you get an adatper that works and charge your battery until it's slightly warm and then see if (...) (29 years ago, 18-Mar-96, to lugnet.robotics.handyboard)
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| | RE: Motor control
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Well if you believe in encapsulation it should be 0 to 100.0 %, then the implementation of the motor speed control could give its best effort in that regard. One of the things I hope to do on my Handyboard is set it up to run two of my PIC motor (...) (29 years ago, 18-Mar-96, to lugnet.robotics.handyboard)
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| | Re: Resets
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Actually, when I first tried the new motors, I was able to use them for a while. It wasn't until I went to download a different program that it started happening. That's what's confusing me. Is it possible that the L293D is burned or something like (...) (29 years ago, 18-Mar-96, to lugnet.robotics.handyboard)
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| | Re: Expansion Board
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Dear Luc, Thank you for your feedback regarding the Expansion Board. (Other users out there---what's going on?) To answer some of your questions: (...) you can try requesting a sample from maxim directly. They even let you do it from their web site: (...) (29 years ago, 18-Mar-96, to lugnet.robotics.handyboard)
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