Tutorial 4: Arduino Knight Rider

In this tutorial, eight LEDs are interfaced to the Arduino Uno board. This is not complicated – it is just like interfacing a single LED to the Arduino as done in tutorial 3, but eight times over. A program is then loaded to the Arduino that will turn the eight LEDs into a “Knight rider” display.

The following video shows what you will achieve:


You will need to have completed tutorial 3 and its prerequisites before attempting this tutorial.Tutorial 4 Arduino Knight Rider


Besides a breadboard, Arduino Uno and USB cable, you will need:

8470 ohm resistor (yellow – violet – brown)R11/4W, 5% or betterResistors
85mm red LEDD1Other coloured and sized LEDs could also be used, e.g. 3mm green LEDSemiconductors
9Wire linksWire links that will reach from the breadboard to the ArduinoWire

Circuit Diagram

The circuit diagram is shown below. It is simply eight LEDs interfaced to the Arduino pins 2 to 9.

Building the Circuit

Place the LEDs next to each other in the breadboard so that the anode (longer lead) is at the left and the cathode is on the right.

Insert the 470 ohm resistors connecting one lead to the LED’s cathode and the other to the top rail.Tutorial 4 Arduino Knight Rider SchematicJoin the anodes of the LEDs to pins 2 to 9 of the Arduino from left to right using single-core wire. Join the top rail to one of the GND pins of the Arduino.

When finished building the circuit, connect the Arduino to the PC via the USB cable.

Loading the Program

The Knight Rider program listing is shown below. Copy it and pasted it into the Arduino IDE.


For more detail: Tutorial 4: Arduino Knight Rider

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