Arduino Bluetooth Controlled 4CH Switch Tutorial

1. Circuir Diagram of Arduino Bluetooth Controlled 4C Switch

2. Code Program Arduino 

Copy code program below to arduino IDE project 

/* 
Relay IN1 connected to PinOut 2 Arduino 
Relay IN2 connected to PinOut 3 Arduino 
Relay IN3 connected to PinOut 4 Arduino 
Relay IN4 connected to PinOut 5 Arduino 
--->you can connected to relay modul 4 channel 
Serial data sending from Arduino Bluetooth Relay 4CH.apk 
data '1'-'4' to on is Ralay CH 1-4 
data 'A'-'D' to off is Ralay CH 1-4 
data '9' to on ALL CH 1-4 
data 'I' to off ALL CH 1-4 
*/ 
#include <SoftwareSerial.h> 
SoftwareSerial mySerial(10, 11); //Pin10 RX , Pin 11 TX connected to--> Bluetooth TX,RX 
#define relay1 2 
#define relay2 3 
#define relay3 4 
#define relay4 5 
char val; 
void setup() { 
 pinMode(relay1,OUTPUT); 
 pinMode(relay2,OUTPUT); 
 pinMode(relay3,OUTPUT); 
 pinMode(relay4,OUTPUT); 
 digitalWrite(relay1,HIGH); 
 digitalWrite(relay2,HIGH); 
 digitalWrite(relay3,HIGH); 
 digitalWrite(relay4,HIGH); 
 mySerial.begin(9600); 
 Serial.begin(9600); 
} 
void loop() { 
//cek data serial from bluetooth android App 
if( mySerial.available() >0 ) { 
 val = mySerial.read(); 
 Serial.println(val);  
} 
//Relay is on
 if( val == '1' ) { 
 digitalWrite(relay1,LOW); } 
 else if( val == '2' ) { 
 digitalWrite(relay2,LOW); } 
 else if( val == '3' ) { 
 digitalWrite(relay3,LOW); } 
 else if( val == '4' ) { 
 digitalWrite(relay4,LOW); } 
 //relay all on 
 else if( val == '9' ) { 
 digitalWrite(relay1,LOW); 
 digitalWrite(relay2,LOW); 
 digitalWrite(relay3,LOW); 
 digitalWrite(relay4,LOW); 
} 
//relay is off 
 else if( val == 'A' ) { 
 digitalWrite(relay1,HIGH); } 
 else if( val == 'B' ) { 
 digitalWrite(relay2,HIGH); } 
 else if( val == 'C' ) { 
 digitalWrite(relay3,HIGH); } 
 else if( val == 'D' ) { 
 digitalWrite(relay4,HIGH); } 
 //relay all off  
 else if( val == 'I' ) { 
 digitalWrite(relay1,HIGH); 
 digitalWrite(relay2,HIGH); 
 digitalWrite(relay3,HIGH); 
 digitalWrite(relay4,HIGH); 
} 
} 

3. Try APPS and Pair Bluetooth Module to Android Device

Thanks.