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 Robotics / Handy Board / *1644 (-10)
  Spike protection
 
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)
 
  Re: 100 sensors
 
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)
 
  LCD and interrupts
 
(...) 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)
 
  Re: non-linear motor speed problem
 
(...) 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)
 
  Re: non-linear motor speed problem
 
(...) 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)
 
  Re: non-linear motor speed problem
 
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)
 
  non-linear motor speed problem
 
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)
 
  Re: Problems with my DC-Motors
 
(...) 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)
 
  Re[6]: IR Collision avoidance
 
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)
 
  Re: IR collision avoidance
 
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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