Published April 30, 2022 © GPL3+

Light Switch Bluetooth

Turn on your room light using your phone

IntermediateShowcase (no instructions)921

Things used in this project

Hardware components

Arduino Nano R3

Tactile Switch, Top Actuated

HC-05 Bluetooth Module

Relay Module (Generic)

Hook Up Wire Kit, 22 AWG

Software apps and online services

Arduino IDE

Hand tools and fabrication machines

Soldering iron (generic)

Wire Stripper & Cutter, 18-10 AWG / 0.75-4mm² Capacity Wires

Story

Did you ever lay in bed and wanted to turn off the light but you didn't want to stand up and go. Here is the solution for you.

In this project we will make Bluetooth light switch.

Wiring:

In each wall switch you will find two wires, once the two wires are connected the power will be sent to the light for it to turn on. we will connect the wires using a relay which is an automated switch. If the relay will get power the two wires will be connected, and if it will be off the two wires will not be connected.

Usage:

We will turn on the relay using two ways:

1. Using a button

2. Using Bluetooth

Power:

To power the entire circuit I cut a USB and took - and + wires and connected it and then after connected the USB to any USB 5v charger.

Bluetooth:

For this project I made my own Bluetooth app. If you would like to use any other app you will need to know that, to turn on the commend is "1#", and to turn off "0#".

Connecting to the wall:

Before you will put every thing in the wall you will need to do 2 things. First solder every wire to each other to avoid big size(so it can go in the wall). After you soldered everything to the Arduino nano take out the existing switch from the wall and connect the two wires to the middle plug and the NO plug in the relay. After everything is connected stick everything inside the wall (i used tape to cover everything up).

Warning:

Working with high power is very dangers and you will need to be careful. make sure you turn off the fuse first before doing everything

GitHub:

https://github.com/dzh121/BluetoothLightSwitch

Code

The code

#include <SoftwareSerial.h>
SoftwareSerial MyBlue(8,10);

String message;
char character;
int lastButtonState = 0;

int buttonPin = 3;
int relayPin = 4;

void setup() {
  Serial.begin(9600);
  MyBlue.begin(9660);
  
  pinMode(buttonPin, INPUT);
  pinMode(relayPin, OUTPUT);
}

void loop() { 
  while(MyBlue.available()){
    character = MyBlue.read();
    if(character == '#'){
      Serial.println(message);
     switch(message.toInt()){
      case 1:
      Serial.println("on bluetooth");
        digitalWrite(relayPin,HIGH);
        break;
      case 0:
      Serial.println("off bluetooth");
        digitalWrite(relayPin,LOW);
        break;
     }
     message = "";
     Serial.println();
    }else{
      Serial.println(character);
      message.concat(character);
    }
  }
  if (digitalRead(buttonPin) == HIGH) {
    if(lastButtonState == 0){
      lastButtonState = 1;
      Serial.println("on");
      digitalWrite(relayPin,HIGH);
    }else if (lastButtonState == 1){
      Serial.println("off");
      lastButtonState = 0;
      digitalWrite(relayPin,LOW);
    }
    delay(300);
  }
}

Credits

Daniel Harel

1 project • 2 followers

16 years old, Loves building, programming electronics and 3D printing.

Contact

Comments

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Light Switch Bluetooth

Things used in this project

Hardware components

Software apps and online services

Hand tools and fabrication machines

Story

Wiring:

Usage:

Power:

Bluetooth:

Connecting to the wall:

Warning:

GitHub:

Schematics

Schematic

Bluetooth app

Code

The code

Credits

Daniel Harel

Comments

Embed the widget on your own site

Light Switch Bluetooth

Light Switch Bluetooth

Things used in this project

Hardware components

Software apps and online services

Hand tools and fabrication machines

Story

Wiring:

Usage:

Power:

Bluetooth:

Connecting to the wall:

Warning:

GitHub:

Schematics

Schematic

Bluetooth app

Code

The code

Credits

Daniel Harel

Comments

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