Our Porter range can be used as an interface between a Raspberry Pi and a motor.
The Pi can provide a PWM output via its GPIO pins and this can be fed into the input of the Porter. However the Pi has a 0 – 3.3V output and the Porter needs a 0-4V input so to be able to achieve full power so we need to do a little jiggery pokery to shift the levels a bit. We also need to add some capacitance to the input to average out the PWM from the Pi.
A configuration that we have used is here:
We haven’t finalised the values yet but it shows the general idea.
We have tested the Porter satisfactorily between 10Hz and 10kHz.
There are a number of programs / scripts available that give control of the frequency and duty cycle of the PWM output from the Pi. We’re in the final stages of testing one and we’ll put it here when we’re happy with it.
We’ll be testing our other controllers and putting details of those in the knowledge base as soon as we can.