Bipolar stepper motors typically have 4 pins, which correspond to two coils. There are a number of different types of stepper motors, but in this tutorial we will specifically be addressing bipolar stepper motors. PinMode(8, OUTPUT) //Initiates Brake Channel A pinĭigitalWrite(13, LOW) //Establishes backward direction of Channel BĭigitalWrite(8, LOW) //Disengage the Brake for Channel BĪnalogWrite(11, 123) //Spins the motor on Channel B at half speedĭigitalWrite(9, HIGH) //Engage the Brake for Channel AĭigitalWrite(9, HIGH) //Engage the Brake for Channel BĭigitalWrite(13, HIGH) //Establishes forward direction of Channel BĪnalogWrite(11, 255) //Spins the motor on Channel B at full speed PinMode(13, OUTPUT) //Initiates Motor Channel A pin The only difference code-wise is that you need to engage a second channel to control the second motor. Interfacing with two motors is pretty much the same as interfacing with one motor. PinMode(9, OUTPUT) //Initiates Brake Channel A pinĭigitalWrite(12, HIGH) //Establishes forward direction of Channel AĭigitalWrite(9, LOW) //Disengage the Brake for Channel AĪnalogWrite(3, 255) //Spins the motor on Channel A at full speedĭigitalWrite(9, HIGH) //Eengage the Brake for Channel AĭigitalWrite(12, LOW) //Establishes backward direction of Channel AĪnalogWrite(3, 123) //Spins the motor on Channel A at half speed PinMode(12, OUTPUT) //Initiates Motor Channel A pin To connect your external power supply, connect the positive (red) wire from the power supply to the 'Vin' terminal, and the ground (black) wire to the 'GND' terminal.įinally, upload the code to control the Motor Shield to the Arduino.

It is recommended that you always use one. To control a motor using the Arduino Motor Shield, first plug the motor's positive (red) wire into Channel A's + terminal on the motor shield, and the motor's ground (black) wire into Channel A's - terminal on the shield.Īn external power supply is not always necessary, but it drastically improves the motor's performance.

Hook up stepper motor arduino