 | | Re: Driving large motors with the Handyboard
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(...) Thanks for the tip. I got a hold of the book and read some of it. :) I was wondering if sending pulses to the motor would cause "choppy" rotation....or does it occur so fast that inertia effects make it "smooth". Also, with an h-bridge, is it (...) (29 years ago, 25-Mar-96, to lugnet.robotics.handyboard)
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| | pulse trains
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Mike, Out of curiosity, what are you using the pulse trains for? (If you're running multiple servos, I think I know a single-chip hardware mod to drive up to 8 servos from a single timer output.) -- Randy (29 years ago, 24-Mar-96, to lugnet.robotics.handyboard)
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| | TOC 2 & 3
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AAAARRRGGGHHHHHH!! After the pain of relearning assembler and getting interrupt routines to work, it seems my assumption of the availability of TOC 2 & 3 is incorrect. I need 2 (wanted 4) pulse trains to go out. According to the diagrams Fred (...) (29 years ago, 24-Mar-96, to lugnet.robotics.handyboard)
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| | Re: OC2 and OC3 outputs?
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Take a look at the schematics, which are linked from the top page of the Handy Board web site. The info you are looking for is in the CPU / memory schematic. For the DC Motor outputs, the board uses a separate output latch---not the timer outputs. (...) (29 years ago, 24-Mar-96, to lugnet.robotics.handyboard)
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| | DC Motor Position control
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I am wondering if anyone tried to write an IC program for DC motor position control using PID/P or whatever with a handyboard. I am also looking for a good precision DC motor (with encoder and gearbox integrated), I very appreciate your help for any (...) (29 years ago, 24-Mar-96, to lugnet.robotics.handyboard)
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| | Re: Resets
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The MB design keeps ground in common, but the ground to the cpu, has an inductor in line with it, the HB also has a inductor on the ground side, I think. You might want to put an inductor on both sides of the motor, with a cap inbetween both of (...) (29 years ago, 24-Mar-96, to lugnet.robotics.handyboard)
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| | Re: Resets
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If I add a separate motor power to the L293's, can I keep the ground lines common? If not, what pins are motor ground? (I know pins 4,5,12, and 13 are ground) Thanks. -John (...) (29 years ago, 23-Mar-96, to lugnet.robotics.handyboard)
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| | IC for Windows
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(...) We use Microsoft Visual C++ (v. 4.0). -- Randy (29 years ago, 23-Mar-96, to lugnet.robotics.handyboard)
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| | IC for Windows.
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Just outta curiousity, what was IC Win developed with? (29 years ago, 23-Mar-96, to lugnet.robotics.handyboard)
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| | Re: Driving large motors with the Handyboard
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There are several ways to do this. In Mobile Robots, they talk about H bridge circuits. If you are doing less than 2A use a L298 and some some clamping diodes ( these keep the driver chip from being fried when you turn the motor off). The L298 has 2 (...) (29 years ago, 23-Mar-96, to lugnet.robotics.handyboard)
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| | 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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