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In lugnet.general, Sivan Toledo wrote:
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In lugnet.general, Philippe Hurbain wrote:
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The LEGO company just released a document detailing the complete protocol
used by Power Functions RC receiver.
I host the document on my Power Functions
presentation page.
As you can see this opens up a new world of possibilities...
Philo
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I just tried the new commands with a home-made NXT-controlled IR remote. I
was able to get them to work without a problem. I verified the single-output
PWM mode, which starts a motor at a given power level, in which it stays
indefinitely (until you send a break or float command, or turn off the
battery power to the receiver.
Sivan
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Very good. Have you done experiments to map the power level settings to RPM? I
am guessing that each of the 7 steps sets literally a power level (PWM width)
and not a speed. Have you done experiments under load to see what happens to the
speed at each power level as you increase load? Keeping the speed constant
would require back-EMF measurement so I doubt that it is included, but, hey,
maybe there is a nice surprise in there.
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