Lesson 15 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

– Several jumper wires

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 S to D2 of SunFounder Uno board. When the Tilt-switch inducts tilt signals, the LED will be on. Otherwise, it will be off.

Experimental Procedures

Step 1: Build the circuit

                                   Tilt-switch Module          SunFounder Uno

                                                S ——————————— D2

                                                –  —————————— GND

                                                 + ——————————- 5V

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

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

Code

const int buttonPin = 2; // the number of the tilt switch pin
const int ledPin = 13; // the number of the LED pin// variables will change:
int buttonState = 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(buttonPin, INPUT);
}void loop(){
// read the state of the tilt switch value:
buttonState = digitalRead(buttonPin);if (buttonState == HIGH) {
// turn LED on:
digitalWrite(ledPin, HIGH);
}
else {
// turn LED off:
digitalWrite(ledPin, LOW);
}
}