Lesson 6 Tilt Switch

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The tilt switch used here is a ball one with a metal ball inside. It is used to detect small angle of inclination.


– 1 * SunFounder Uno board

– 1 * USB data cable

– 1 * Tilt switch

– Several jumper wires

Experimental Principle

The principle is very simple. When the switch is tilted in a certain angle, the ball inside rolls down and touches the two contacts connected to the pins outside, thus triggering circuits. Otherwise the ball will stay away from the contacts, thus breaking the circuits.

Experimental Procedures

Step 1: Build the circuit

The schematic diagram

Step 2: Program (Please refer to the example code in LEARN -> Get Tutorial on our website)

Step 3: Compile the code

Step 4: Upload the sketch to the SunFounder Uno board

Now, tilt the switch, and the LED attached to pin 13 on SunFounder Uno board will light up.


const int ledPin = 13;//the led attach tovoid setup()

  pinMode(ledPin,OUTPUT);//initialize the ledPin as an output
  digitalWrite(2, HIGH);

void loop() 

  int digitalVal = digitalRead(2);
  if(HIGH == digitalVal)
    digitalWrite(ledPin,LOW);//turn the led off
    digitalWrite(ledPin,HIGH);//turn the led on