Subject:
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8475 -- motors and steering Oh My
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Newsgroups:
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lugnet.org.ca.rtltoronto
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Date:
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Sat, 28 Dec 2002 21:26:09 GMT
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Viewed:
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2588 times
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> Were you using a geared 9v motor non loaded? If so, then it's not
> surprising that you noticed no difference.
Yes I was testing on an unloaded 9V geared motor. Thats how my
RPM-o-Meter works best.
> Try it with a load. I tried it with a weight at the end of an arm, and
> at one point on the controller it just buzzed, and at the next it
> rotated very slowly, and at the next it rotated faster.
>
> Here is a pic of what I used:
> http://members.rogers.com/4tee2/DCP_1063.jpg
>
> Thats a lego weight at the end of that arm.
I just re-did this test and you are correct. when you load a geared
motor (i put a 40t gear on the motor and put friction on the teeth)
then you can perceive 3 states of "something"
Darn it... why did I have to go and loan my multimeter to me dad. I
want to put a DM meter on this and see what volts I get.
Trevyn... do this and let me know. I'm curious if its PWM or just a
lower voltage.
Chris
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Message has 2 Replies:
 | | Re: 8475 -- motors and steering Oh My
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| It is indeed PWM. I got out my oscilliscope and checked it, and here are the results I got: At setting 1 (closest to off): Th: 1ms Tl: 2ms Tt: 3ms 9Vpp At setting 2: Th: 2ms Tl: 1ms Tt: 3ms 9Vpp And at full on, it's just 9v DC. (...) (24 years ago, 29-Dec-02, to lugnet.org.ca.rtltoronto)
| | | Re: 8475 -- motors and steering Oh My
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| (...) It doesn't matter. DMM's are not good at measuring pulsed signals. (unless you have one of the more expensive true-RMS meters which can calculate the average of a non-sinusoidal waveform. You really need an oscilloscope for this. (...) It will (...) (24 years ago, 30-Dec-02, to lugnet.org.ca.rtltoronto)
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Message is in Reply To:
| | Re: 8475 -- a good buy
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| (...) Am not!! (...) Were you using a geared 9v motor non loaded? If so, then it's not surprising that you noticed no difference. Try it with a load. I tried it with a weight at the end of an arm, and at one point on the controller it just buzzed, (...) (24 years ago, 28-Dec-02, to lugnet.org.ca.rtltoronto)
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