 | | ds1233-10
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I have had trouble finding this part(DS1233-10). Does anyone know the properties of this part or an acceptable replacement? Jim Hamilton (28 years ago, 13-Mar-97, to lugnet.robotics.handyboard)
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| | Re: IR Collision avoidance
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(...) My question is...in the first diagram (below) the resistance is 220 ohm ie 0.2KOhm But in the second diagram the resistances are 2.2KOhm Which is the correct one? ---...--- (...) (28 years ago, 12-Mar-97, to lugnet.robotics.handyboard)
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| | Re: 100 sensors
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(...) A resistor ladder is simply several resistors, connected in series with a switch between each one. On the handyboard you would do something like this: VCC ---\/\/\/---\/\/\/--.../---...--- | | | | | | \ SW1 \ SW2 \ SW3 \ SW4 \ SW5 | \ \ \ \ \ (...) (28 years ago, 12-Mar-97, to lugnet.robotics.handyboard)
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| | Re: Spike protection
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Terry, If you have the L293D or the SN754410 motor driver chips, then the diodes are present. - Prabal (...) (28 years ago, 12-Mar-97, to lugnet.robotics.handyboard)
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| | ztx614
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Digikey is out of stock of the ztx614 transistor. Can anyone tell me another supplier for this transistor? Can I substitute a different transistor? If so, which one(s) would work? Thanks! .... Jim Montague (28 years ago, 12-Mar-97, to lugnet.robotics.handyboard)
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| | 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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