DC motor: speed and direction

Goal

Control a DC motor in speed (PWM) and direction (H-bridge).

Why it matters

A motor is never wired straight to a pin: it needs a power stage.

Steps

1. 01Add the DC motor and its driver.
2. 02Two direction pins (IN1/IN2) + one PWM pin (ENA).
3. 03Write a motor(speed) function that accepts negative values.
4. 04Test forward, stop, reverse.

Next tutorials

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  Breathe an LED from 0 to 255 with analogWrite().

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  Set LED brightness with the knob (10 bits to 8 bits).

• RGB LED: mixing colours

  Create any colour with three PWM channels.

• Smooth fade (sine curve)

  Make the fade look linear by using a non-linear curve.