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• #Two dc motors arduino reverse code#

#Two dc motors arduino reverse code#

I used this code that works but sometimes the motor changes direction without pressing the switch include a fairly good tutorial which covers the basic principles:

You will need some additional circuitry which is able to reverse the polarity of the connections to the motor (meaning your PWM value just controls speed, and doesn't care about direction).Īn H-bridge is the usual approach for this. To address your original motor control question, there's no sensible way to change the motor's direction using the PWM value. PWM is also useful for controlling the brightness of LEDs, which don't respond so well to changes in current/voltage. The constant pulses still make the motor turn at an adjustable speed, but without losing torque.

When you're controlling a DC motor, this approach is actually better than varying the voltage. The thing you change is how long the signal is HIGH for on each pulse. You don't actually change the output voltage at all - it's only ever HIGH or LOW (+5v or +0v). It's actually a digital signal which is constantly pulsing on and off very quickly (several hundred times per second).