materials:-
- Arduino uno
- Bluetooth module
- 2 channel relay
- jumper wires
diagram:-
Connections:-
- Bluetooth module RX = Arduino TX
- Bluetooth module TX = Arduino RX
- Bluetooth GND = Arduino GND
- Bluetooth VCC/5V = arduino 3.3V
- Relay IN1 = Arduino pin 12
- Relay IN2 = Arduino pin 13
- Relay 5V = Arduino 5V
- Relay GND = Arduino GND
Code:-
//https://mrarduinoprojects.blogspot.com
char val;
void setup() {
pinMode(13, OUTPUT);
pinMode(12,OUTPUT);
Serial.begin(9600);
}
void loop() {
if (Serial.available()) {
val = Serial.read();
Serial.println();
}
if (val == '1')
{ digitalWrite(13, HIGH);
}
else if (val == '2')
{
digitalWrite(13, LOW);
}
else if (val == '3')
{
digitalWrite(12, HIGH);
}
else if (val == '4')
{
digitalWrite(12, LOW);
}
delay(100);
}