RCX programmable brick : 1303


Robotics / RCX / 1303	1302 \| 1304

Subject:	Maximum sample rate (turn rate) for rotation sensor
Newsgroups:	lugnet.robotics.rcx
Date:	Fri, 20 Jul 2001 13:51:53 GMT
Viewed:	1286 times

Does anyone know the correct maximum sampling rate for the Lego rotation sensor? This morning I noticed that Dave Baum gives a value of 1250 RPM in his "Definitive Guide" (page 29), but looking at http://guide.lugnet.com/set/9756 I see a value of 500 RPM. Which is correct? Thanks. gary

Message has 2 Replies:

		Re: Maximum sample rate (turn rate) for rotation sensor
The hardware can actually do (in my testing) up to ~3000 rpm with good accuracy. The problem is with the standard software, which cannot do more than some low number (which may or may not be 500, I don't recall) because of how it samples the HW. (...) (23 years ago, 20-Jul-01, to lugnet.robotics.rcx)

		Re: Maximum sample rate (turn rate) for rotation sensor
When using the standard firmware, sensors are sampled every 3 ms. The rotation sensor uses a quadrature encoder with a 1:4 gearing between the axle and the encoder, so there are 16 "ticks" per revolution of the axle. The decoding routine in the (...) (23 years ago, 21-Jul-01, to lugnet.robotics.rcx)

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