I have a National Instruments myRIO. I was trying to use it to control a Zumo - it is a couple of years old so I assume it is using the v1.1 Zumo shield for Arduino.
To perform my test I used jumpers to connect pins 7 and 9 from an Arduino to the corresponding pins on the Zumo and I could control the right motor as expected. When I move the wires from the Arduino to the myRIO and provided the same signal, I got no response from the motor.
The only difference in the signals is that the myRIO provides a 3.3V PWM signal. I looked at the documentation for the DRV8835 motor drive and it would appear that it is expecting a 5V PWM signal becasue it has its VCC (pin 12) connected to 5V.
So two questions… Is my reasoning correct, and is there any simple workaround?