Arduino-Tutorials/Four Wheel Drive at master · SamStans/Arduino-Tutorials · GitHub

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#include <AFMotor.h> //motor sheild library
AF_DCMotor mot1 (1); //defines [back right] motor name; "(1)" is which motor slot it's in
AF_DCMotor mot2 (2); //defines [front right] motor name
AF_DCMotor mot3 (3); //defines [back left] motor name
AF_DCMotor mot4 (4); //defines [front left] motor name


void setup() {

mot1.setSpeed(255); //give external power to motors 1-4
mot2.setSpeed(255); // ^
mot3.setSpeed(255); // ^
mot4.setSpeed(255); // ^

}


void loop() {

// mot#.run(FORWARD);  |moves motor one way
// mot#.run(BACKWARD); |moves motor the other way
// mot#.run(RELEASE);  |stop moving
// delay(#);           |how long previous action is carried out (in milliseconds) (1 second = 1000 milliseconds)

// move forward
mot1.run(FORWARD);
mot2.run(FORWARD);
mot3.run(FORWARD);
mot4.run(FORWARD);
delay(2000);

// stop moving
mot1.run(RELEASE);
mot2.run(RELEASE);
mot3.run(RELEASE);
mot4.run(RELEASE);
delay(2000);

// turn right
mot1.run(FORWARD);
mot2.run(FORWARD);
mot3.run(BACKWARD);
mot4.run(BACKWARD);

// stop moving
mot1.run(RELEASE);
mot2.run(RELEASE);
mot3.run(RELEASE);
mot4.run(RELEASE);
delay(2000);

}