 | | Motors & handyboard —Oriol de los Santos Vidal
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| | | Yesterday I tried to run a motor out of the HB. First I tried how much current it needed with a multimeter and a 5V power source ... The result 75mA. When I tried to run the motor from the HB, after turning on the motor at low speed (motor (0,20);) (...) (29 years ago, 14-Feb-97, to lugnet.robotics.handyboard)
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| | | | | Re: Motors & handyboard —Fred G. Martin
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| | | | | (...) how did you take this measurement exactly? I think 75 mA might be kind of low, most motors will draw this much when they are just spinning but doing no useful work, but then draw much more when they are driving a geartrain. (...) actually, (...) (29 years ago, 14-Feb-97, to lugnet.robotics.handyboard)
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| | | | | | | Re: Motors & handyboard —Adam
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| | | | | | Guys, I caught the mail on motors (3V etc.) and wasn't impressed. I just bought one of those Bulldozer Kits from Tamiya and I believe it contains 3V motors. Is there NO possible way of using these motors??? I did notice the HB motor driver chip (...) (29 years ago, 15-Feb-97, to lugnet.robotics.handyboard)
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| | | | | | | | Re: Motors & handyboard —Fred G. Martin
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| | | | | | | (...) 3v toy motors are noisy little buggers and were never designed to be anywhere near a microprocessor. if you reduced the hb motor battery supply to 3v, you might have a chance. at 9v, i really doubt it. -f (...) (29 years ago, 15-Feb-97, to lugnet.robotics.handyboard)
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| | | | | | | | Re: Motors & handyboard —Chuck McManis
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| | | | | | (...) It has been my experience that it is easier to change the drive circuitry than it is to change the motors. The circuitry is just solder and chips, the motors are mechanical tooling. Driving the Tamiya BullDozer from the HB is certainly (...) (29 years ago, 18-Feb-97, to lugnet.robotics.handyboard)
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| | | | | | | | Re: Motors & handyboard —rabbit
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| | | | | | (...) Why not use the H-bridge that is already on the bulldozer? If you work backwards throught the motor driver circuitry, or use the RF controller to send commands to the dozer and see what voltages change you can figure out where the inputs to (...) (29 years ago, 19-Feb-97, to lugnet.robotics.handyboard)
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| | | | | | | | Re: Motors & handyboard —Chuck McManis
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| | | | | | (...) This is also excellent advice. On one R/C car I had, I ended up having to simulate the signal input to the controller because the h-bridge was so screwy but it does save you from having to build your own. On a related note, Radio Shack sells (...) (29 years ago, 19-Feb-97, to lugnet.robotics.handyboard)
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| | | | | Re: Motors & handyboard —Chuck McManis
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| | | | | (...) Unfortunately this is the LEAST amount of current the motor will draw when operating. You have measured the 'unloaded current'. Now, while you have your motor running, grab the shaft between your fingers and stop it, and measure that current. (...) (29 years ago, 14-Feb-97, to lugnet.robotics.handyboard)
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| | | | | Re: Motors & handyboard —MAR ERICSON
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| | | | (...) EE Question: How do you use a multimeter to measure the current? I was told that you need a current probe to do this kind of thing. ?? (29 years ago, 14-Feb-97, to lugnet.robotics.handyboard)
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| | | | | | Re: Motors & handyboard —Adam
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| | | | To measure current with an multimeter or ammeter (volt/ohm/etc.. meter) you must break the circuit at some point and put the meter in series with the circuit thus gapping the break. ie) +-----(+) METER (-)------+ | | | | (+) | POWER | (-) | | | | | (...) (29 years ago, 15-Feb-97, to lugnet.robotics.handyboard)
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| | | | | | Re: Motors & handyboard —ED Spike
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| | | | (...) What is 20? (...) Current meters have an internal resistance. The lower the current range the larger the resistance --- even with digital current meters. Some typical values For example: Digital Analogue Current Range R_meter R_meter 200 uA (...) (29 years ago, 17-Feb-97, to lugnet.robotics.handyboard)
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