 | | Spike protection
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Does anyone know if the motor ports on the HB are spike protected? I would like to actuate a relay from a motor port. Normally a diode across the coil kills the spike, but I was wondering if the drivers on the HB already handle that. Thanks, Terry (...) (28 years ago, 12-Mar-97, to lugnet.robotics.handyboard)
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| | Re: 100 sensors
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What's a resitor ladder? Is there a textbook or something where I can get a schematic? Is is same as a D-A converter? ---...--- ericson mar Master of Engineering Candidate Project: Mobile Robotics mar@cooper.edu (212)353-4356 Department of (...) (28 years ago, 12-Mar-97, to lugnet.robotics.handyboard)
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| | LCD and interrupts
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(...) Actually, that's not quite true. The systick interrupt always runs, and LCD writing happens as _part of_ systick. Any interrupt, by default, disables further interrupts until it's done. Systick is actually different, because it re-enables (...) (28 years ago, 11-Mar-97, to lugnet.robotics.handyboard)
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| | Re: non-linear motor speed problem
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(...) Several reasons. Understand that PWM has the effect of controlling the amount of power fed to the motor, power is related to current in a quadratic (p = i^2r), and your current is related to the voltage applied and the motor parameters (...) (28 years ago, 11-Mar-97, to lugnet.robotics.handyboard)
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| | Re: non-linear motor speed problem
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(...) The (small) load presented by the gears makes it behave quite well with pure DC (...) Sadly, the servo motors have oodles of oomph (the correct technical term for torque etc). My little bot is really a micromouse in training and very light so (...) (28 years ago, 11-Mar-97, to lugnet.robotics.handyboard)
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| | Re: non-linear motor speed problem
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The test isn't fair under no-load conditions, because then the motor just spins when you give it any signal. Are you sure the performance is the same when you have a full operating load? This would not make sense; I would guess that this would mean (...) (28 years ago, 11-Mar-97, to lugnet.robotics.handyboard)
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| | non-linear motor speed problem
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I am using servos converted to plain gearmotors as the motive power for my baby bot. Finally I worked out how to add shaft encoders to them. (Found a small opto switch to poke through the inside of the case on the first gear). The servos I am using (...) (28 years ago, 11-Mar-97, to lugnet.robotics.handyboard)
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| | Re: Problems with my DC-Motors
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(...) Yes, i do / Ja ist schon gut :-) (...) Here i suspect your speed regulator chip. (...) Servo's brauchen nur ein wenig strom -> i really suspect your speed regulator chip. (...) Try swapping your speed controller chip. Groetjes, Hans (28 years ago, 10-Mar-97, to lugnet.robotics.handyboard)
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| | Re[6]: IR Collision avoidance
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Adam, I have it working, but I want to tidy it up a bit. At the moment it uses 2 op-amp stages, I think it can work with one. After all, it's just a precision diode! I will put something on in a few days. Fred, I do not have schematic capture (...) (28 years ago, 10-Mar-97, to lugnet.robotics.handyboard)
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| | Re: IR collision avoidance
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Some IR Leds have graphs from the manufacturer showing angular characteristics. I've seen some nice ones in linear and polar plots of angle vs. intensity. See if you can get the specs of the LEDs you order. This may help you with your configuration. (...) (28 years ago, 9-Mar-97, to lugnet.robotics.handyboard)
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| | Re: Breaking
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I've slammed it backwards a couple of times. ---...--- ericson mar Master of Engineering Candidate Project: Mobile Robotics mar@cooper.edu Department of Mechanical Engineering The Cooper Union for the Advancement of Science and Art ---...--- (...) (28 years ago, 7-Mar-97, to lugnet.robotics.handyboard)
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| | Re: Re[4]: IR Collision avoidance
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Richard, Please send me the schemtics on the $2 circuit and whatever else I need to know to get this thing up and running. I would appreciate this very much. Thanks. (...) (28 years ago, 7-Mar-97, to lugnet.robotics.handyboard)
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| | IR sensors
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Is there any sort of "pre-built" IR module to interface IR to the handyboard. Perhaps a schematic or something? Thanks ---...--- Adam B. Cox check out my web page Computer Engineer (URL) Communications Corp. vmail: 416-241-7000 (x224) ---...--- (28 years ago, 7-Mar-97, to lugnet.robotics.handyboard)
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| | Problem with H-Drives
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I've been having problems with the Handy Board being able to go into download mode. It seems to work fine without any motor drivers connected, and with one driver chip plugged into one side of the board, it also seems to work, but still not (...) (28 years ago, 7-Mar-97, to lugnet.robotics.handyboard)
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| | vector2x
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Does anyone have schematics or know where I can download schematics on the hookup of the v2x compass? Thanks. ---...--- Adam B. Cox check out my web page Computer Engineer (URL) Communications Corp. vmail: 416-241-7000 (x224) ---...--- (28 years ago, 7-Mar-97, to lugnet.robotics.handyboard)
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| | Re: SPI & Vector2x
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(...) Maybe, it'll depend on the flooring. I think re-bar in a concrete floor might affect a compass too close to the floor. Last night I was playing with the compass, and found that passing a screwdriver within about 3 inches would affect the (...) (28 years ago, 7-Mar-97, to lugnet.robotics.handyboard)
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| | Preprocessor for DOS or Windows or '95?
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Hello, I want to use assembler in conjunction with IC, as described in the handyboard technical reference. Apparently this needs a preprocessor. Does anyone have such a thing, or know how to kludge it, or even what it does so I can try to write (...) (28 years ago, 7-Mar-97, to lugnet.robotics.handyboard)
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| | Re: Re[2]: phone cord length
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thx for correcting my wording. e.g., instead of saying "half twist" i should say "straight through". anyhow, we agree on the definition of what is a phone cable and what is not a phone cable, we just have a different way of illustrating it. the (...) (28 years ago, 7-Mar-97, to lugnet.robotics.handyboard)
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| | Breaking
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I was wondering what methods of breaking have been used with handyboard motors. Is it OK just to slam them in reverse for a few milliseconds ? Or will the large current impulse be harmful to the motor and driver chips ? It looks like the breaking (...) (28 years ago, 7-Mar-97, to lugnet.robotics.handyboard)
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| | Re: Re[2]: phone cord length
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Sorry Fred, but I must respectfully disagree..... Fred G. Martin wrote: (snip) (...) Actually it is phone cords which are the crossover type. Use of a patch- cord tester confirms this. I am not familiar with any RJ11 network cables, but I know that (...) (28 years ago, 7-Mar-97, to lugnet.robotics.handyboard)
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