Lesson 21 Tilt Switch

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Introduction

The tilt switch sensor module is a ball tilt switch with a metal ball inside. It is used to detect inclinations of a small angle.

Components

– 1 * SunFounder Uno board

– 1 * USB data cable

– 1 * Tilt switch module

– 1 * 3-Pin anti-reverse cable

Experimental Principle

Apply the principle that the ball in the switch moves with different angles of inclination to make triggering circuits. The tilt switch module uses a ball tilt switch with bidirectional conduction. When it tilts towards either side, as long as the tilt degree and force meet the condition, the switch will be energized; thus, it will output low level signals.

In this experiment, we use a tilt switch module and an LED that has been attached to pin 13 of the SunFounder board to build a simple circuit.

With the LED attached to pin 13, connect pin SIG to digital pin 7 of the SunFounder Uno board. Then the tilt switch outputs low signals and the LED will be on. Otherwise it will be off.

Experimental Procedures

Step 1: Build the circuit

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

Step 3: Compile

Step 4: Upload the sketch to SunFounder Uno board

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

 Code

const int sigPin = 7; // the number of the tilt switch pin
const int ledPin = 13; // the number of the LED pin// variables will change:
boolean sigState = 0; // variable for reading the tilt switch statusvoid setup(){
  // initialize the LED pin as an output:
  pinMode(ledPin, OUTPUT);
  // initialize the tilt switch pin as an input:
  pinMode(sigPin, INPUT);
}void loop(){
  // read the state of the tilt switch value:
  sigState = digitalRead(sigPin);  if (sigState == HIGH)  {
    // turn LED on:
    digitalWrite(ledPin, LOW);
  }
  else  {
    // turn LED off:
    digitalWrite(ledPin, HIGH);
  }
}