Arduino Projects
Arduino projects for O Level M4, the PR-4 practical and beginners — LED, button, PWM, sensors, LCD and servo — each with the sketch, the wiring, and how it works.
Digital output
- Arduino LED Blink Code with WiringeasyThe Hello World of Arduino — and the first program in almost every PR-4 practical.
- Arduino Two LEDs Blinking AlternatelyeasyControlling two outputs at once — the step between a single blink and a traffic light.
- Arduino Traffic Light Project CodemediumThree LEDs in a fixed sequence — a classic PR-4 question that tests timing and order.