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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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