I am using the drv8838 to control motor speed with pwm. It works perfectly with a bare dc motor. But when I use it on a dc water pump, the motor on the pump just whines but does not turn. If I eliminate the pwm code and just use the digitalWrite (enablePin, HIGH) the pump works fine. Any ideas? Are there some motors pwm just won’t work with?
Power is not an issue, running of a lab power supply. And again, the code works as expected with a plain dc motor.