Lesson 7 Tilt-Switch

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Introduction

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

Components

– 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 Tutorials 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.

Code

//tilt switch
//tilt the switch, and the LED attached to pin 13 on SunFounder Uno board will light up.
//tilt switch attach to pin2
//Email: support@sunfounder.com
//Website: www.sunfounder.com
/*****************************************/
const int ledPin = 13;//the led attach tovoid setup()
{
pinMode(ledPin,OUTPUT);//initialize the ledPin as an output
pinMode(2,INPUT);//set pin2 as INPUT
digitalWrite(2, HIGH);//set pin2 as HIGH
}
/******************************************/
void loop()
{
int digitalVal = digitalRead(2);//Read the value of pin2
if(HIGH == digitalVal)//if tilt switch is not breakover
{
digitalWrite(ledPin,LOW);//turn the led off
}
else ////if tilt switch breakover
{
digitalWrite(ledPin,HIGH);//turn the led on
}
}
/**********************************************/

Video