To answer my own question - I see that there is something called a LINX toolkit, which provides LabVIEW VIs for interacting with common embedded platforms like Arduino, chipKIT and myRIO!
I tried the Arduino and used Labview LINX + the Sparkfun Motor Control Driver. The duty cycle is what controls the speed and the digital output changes direction.
However, at any duty cycle below 100%, I hear a lot of motor whining/noise. Is that your experience? Any solutions/fixes? Thank you.
It seems to me that the problem has to do with the PWM frequency using the Arduino. It is 500 Hz. I have used a functional generator and the problem disappears when the frequency is above 20 khz! So, the real issue I am finding is how to update the frequency on the Arduino PWM pin. Any reliable info on that?
What arduino are you using? You should try Arduino Due. Arduino Due can generate up to 84 MHZ stable frequency.
"Arduino Due is based on Atmel’s ATSAM3x8E 32-bit ARMCortext-M3 processor. The processor core runs at 84 MHz, which is significantly faster than its 8-bit AVR counterpart ATmega328p which runs at 16 MHz.
I am using the Arduino Uno. The issue is not about the clock frequency, but the digital PWM signal frequency. That defaults to 500 Hz on PIN 9 for example. There is a way to update/increase that apparently, but it is not quite working out for me.
