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Lesson 5 Tilt Switch

Introduction

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

Components

../_images/mega10.png

Schematic Diagram

The schematic diagram:

../_images/mega11.png

Experimental Procedures

Step 1: Build the circuit

../_images/image96.png

Step 2: Open the code file.

Step 3: Select the Board and Port.

Step 4: Upload the sketch to the board.

Now, tilt the switch, and the LED attached to pin 13 on Mega 2560 board will light up.

../_images/image97.jpeg

Code

Code Analysis

Whole Code

const int ledPin = 13; //the led attach to

void 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

    }

}

The whole code are very simple, one pin of the tilt switch is connected to pin2, another pin is connected to GND, when tilt the switch, the two pins of the switch will be connected to GND, then let the LED on the pin13 lights up.