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ev3dev / ev3dev-lang

(deprecated) language bindings for ev3dev sensors, motors, LEDs, etc.
GNU General Public License v2.0
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Tacho motor doesn't work in position mode #88

Closed yaqwsx closed 8 years ago

yaqwsx commented 9 years ago

Hello, I tried to used the tacho motor in position (or hold) mode with the newest system image (20-5-2015). I set position_sp to 2000, and then run the run-to-pos-abs command. The motor didn't move. So I tried to set the PID constants. It is impossible to write or read from files hold_pid/k*. All operations fails with "Operation not supported". I think it is a bug. Could you look at it, please?

dlech commented 9 years ago

You must also set the duty_cycle_sp if speed_regulation is off or set the speed_sp if speed_regulation is on. The motor probably was "running", but had zero power.

hold_pid/k* are not implemented (yet) for this motor driver, so "Operation not supported" is the expected error message.

Also, these issues don't seem to have anything to do with the ev3dev-lang libraries, so the correct place to file this type of issue is at https://github.com/ev3dev/ev3dev/issues.

yaqwsx commented 9 years ago

Thanks a lot! I wasn't able to find this information in documentation of the library. It's too bad that the constants aren't implemented yet, since the accuracy of the position regulator is quite terrible...

dlech commented 9 years ago

It's too bad that the constants aren't implemented yet, since the accuracy of the position regulator is quite terrible...

Pull requests are welcome!

WasabiFan commented 8 years ago

Was this resolved/can it be closed?