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fivdi / pigpio

Fast GPIO, PWM, servo control, state change notification and interrupt handling with Node.js on the Raspberry Pi
MIT License
948 stars 89 forks source link

Run stepper motor for a precise number of steps. #88

Closed philipp-cloudproduce closed 4 years ago

philipp-cloudproduce commented 5 years ago

Thanks for making this package. It is really great. I am unable to figure out how to do something specific that I am after though. I would like to be able to turn stepper motor for a precise number of steps. Currently the only thing I can see that I can do is to execute pwmWrite and then set a javascript timer to go off after a specified number of milliseconds and then turn off the pwm. But this seems very imprecise to me. Is there a way that I can set a pwm frequency and duty cycle and then a duration in microseconds? Or even set a number of steps as an input? If this is not currently supported, is it something that could be added to the API? It would make working with stepper motors precisely a lot easier. Thanks!

fivdi commented 5 years ago

Is it possible to achieve what you would like to achieve by doing something similar to what this Python program does in JavaScript?

Is there a way that I can set a pwm frequency and duty cycle and then a duration in microseconds? Or even set a number of steps as an input?

If the pigpio Node.js module provided bindings for the Waves functions available in the pigpio C library then this would be possible. However, the pigpio Node.js module doesn't provide bindings for the Waves functions available in the pigpio C library. See #38.

fivdi commented 4 years ago

Closing in favour of #38