// Same pin definitions as above + PWM on EN (Pin 4) void setup() pinMode(A1, OUTPUT); pinMode(A2, OUTPUT); pinMode(EN, OUTPUT); // Set EN pin as PWM-capable (e.g., Pin 4 on Arduino Uno is not PWM? Use Pin 5 or 6 instead) // This example uses Pin 5 as EN.

delay(1000); for (int i = 100; i >= 0; i--) setSpeed(i); delay(20);

void loop() motorForward(); for (int i = 0; i <= 100; i++) setSpeed(i); delay(20);

void motorForward() digitalWrite(A1, LOW); digitalWrite(A2, HIGH);