Introduction: Clap Activated Light Switch

This simple device allows you to make any common light switch clap activated.

Step 1: Acquire the Components

The components needed can be purchased most easily from Amazon

  • 1 Arduino Uno with leads and power/sync cable
  • 1 microphone
  • 1 180 degrees hi torque micro servo
  • 6 jumper leads
  • 1 power bank
  • 1 sheet of foem core
  • 1 small sheet of thin metal or plastic
  • 1 bread board
  • A 1 inch diameter wooden dowel rod 2 inches long
  • 1 heavy duty paper clip

Step 2: Program and Connect Arduino

With Arduino installed on your computer use the following code to program your arduino:

#include Servo

lightSwitch;

int sensor = 0;

boolean state = false;

int tolerance = 1000;

int counter = 0; int count = 3;

void setup() { Serial.begin(9600);

lightSwitch.attach(5); lightSwitch.write(0);}

void loop() { int raw = analogRead(sensor);

Serial.println(raw);

if (raw > tolerance){counter++;}

else{counter = 0;}

if (counter >= count)

{ if (state == false){ lightsOn();

state = true; }

else if (state == true)

{ lightsOff(); state = false; }

delay(2000); }

}

void lightsOn(){ lightSwitch.write(180); }

void lightsOff(){ lightSwitch.write(0); }

Connect the three leads going to the servo into the ground, "Vin" and #6 pins on the Arduino.

Plug the microphone into the breadboard and connect the 3 leads into another ground, "5v", and A0 pins on the Arduino.

Plug the power bank into the Arduino.

Step 3: Light Switch Attachment

Picture of Light Switch Attachment

Mark the metal or plastic plate and cut it to size.

Use a light switch to mark where to drill the hole for the 2 screws and and where to cut the slot for the switch and cut.

Use the piece of wood to make two legs that will hold the servo off the plate. I used hot glue to attach the servo to the wood.

Cut the foam core to build a box around the Arduino-microphone set up for protection.

Drill through the plate into the 2 wooden legs to connect the servo to the plate.

Mount the device to the light switch.

Straighten the paper clip and make a loop at one end to go around the switch. At the other end bend the clip so that it attaches the the servo arm.

Step 4: Try It Out!

Picture of Try It Out!

With everything connected, clap and the switch should be flipped. In some cases you may have to clap more than once to activate it.

Comments

DIY Hacks and How Tos (author)2017-10-08

Nice design. There are probably a lot of circuits that you could control with a clapper like this.