Home automation is one of in demand concepts in today’s world. Home automation reduces the physical efforts and integrates the control for any number of appliances in to a single control unit. Hence, a simple home automation system is a remote control of different electrical appliances i.e. turning them on or off with the help of a remote.In this project, a simple home automation system using RF Module is designed. Okey,let's make it.
Components Required
Transmitter
| 1. | Arduino UNO | * 1 |
| 2. | 434 MHz RF Transmitter | * 1 |
| 3. | Push Buttons | * 4 |
| 4. | 1 KΩ Resistor | * 4 |
| 5. | Bread Board | * 1 |
| 6. | 9V Battery | * 1 |
| 7. | Jumper wires | * 1 |
Receiver
| 1. | Arduino UNO | * 1 |
| 2. | 434 MHz RF Receiver | * 1 |
| 3. | 2N2222 NPN Transistor | * 2 |
| 4. | 1 KΩ Resistor | * 2 |
| 5. | 1N4007 PN Junction Diode | * 2 |
| 6. | 12V Relay | * 2 |
| 7. | Bread Board | * 1 |
| 8. | Power Supply (Adapter) | * 1 |
| 9. | Jumper wires | * 1 |
Circuit Diagram
Program
Transmitter
const int RF_TX_PIN = 8;
const int load1_ON = 6;
const int load1_OFF = 5;
const int load2_ON = 4;
const int load2_OFF = 3;
char msg[6] = "";
int load1ON = 0;
int load1OFF = 0;
int load2ON = 0;
int load2OFF = 0;
void setup()
{
vw_set_ptt_inverted(true);
vw_set_tx_pin(RF_TX_PIN);
vw_setup(2000);
pinMode(load1_ON, INPUT);
pinMode(load1_OFF, INPUT);
pinMode(load2_ON, INPUT);
pinMode(load2_OFF, INPUT);
}
void loop()
{
load1ON = digitalRead(load1_ON);
load1OFF = digitalRead(load1_OFF);
load2ON = digitalRead(load2_ON);
load2OFF = digitalRead(load2_OFF);
if (load1ON == HIGH)
{
strcpy(msg, "@ABC$");
}
if (load1OFF == HIGH)
{
strcpy(msg, "@BOFF$");
}
if (load2ON == HIGH)
{
strcpy(msg, "@FON$");
}
if (load2OFF == HIGH)
{
strcpy(msg, "@FOFF$");
}
if(strlen(msg)>0)
{
sendMsg(msg);
}
strcpy(msg, "");
resetLoads();
}
void sendMsg(char msg[])
{
vw_send((uint8_t *)msg, strlen(msg));
vw_wait_tx();
delay(400);
}
void resetLoads()
{
load1ON = 0;
load1OFF = 0;
load2ON = 0;
load2OFF = 0;
}
Receiver
const int RF_RX_PIN = 11;
const int load1 = 4;
const int load2 = 5;
const int errorLED = 13;
boolean bload1 = false;
boolean bload2 = false;
void setup()
{
vw_set_ptt_inverted(true);
vw_set_rx_pin(RF_RX_PIN);
vw_setup(2000);
vw_rx_start();
pinMode(errorLED, OUTPUT);
pinMode(load1, OUTPUT);
pinMode(load2, OUTPUT);
bload1 = false;
bload2 = false;
}
void loop()
{
uint8_t buf[VW_MAX_MESSAGE_LEN];
uint8_t buflen = VW_MAX_MESSAGE_LEN;
if(vw_get_message(buf, &buflen))
{
delay(500);
messageDecode ( (char *) buf);
delay(500);
}
if(bload1 == true)
{
digitalWrite(load1, HIGH);
}
if(bload1 == false)
{
digitalWrite(load1, LOW);
}
if(bload2 == true)
{
digitalWrite(load2, HIGH);
}
if(bload2 == false)
{
digitalWrite(load2, LOW);
}
}
void messageDecode(char msg[])
{
if (strlen(msg) ==0)
{
ErrorLED();
return;
}
if ( compareMessage(msg, '@') == false || compareMessage(msg, '$') == false)
{
ErrorLED();
return;
}
char cTag[5] ="";
int index =0;
int iLoop = IndexOf(msg,'@');
if(iLoop == -1)
{
ErrorLED();
return;
}
iLoop++;
while (iLoop < strlen(msg))
{
if(msg[iLoop] == '$')
{
break;
}
else
{
cTag[index] = msg[iLoop];
index++;
}
iLoop ++;
}
String sTag = String(cTag);
if (sTag.equals("ABC"))
{
bload1 = true;
}
if (sTag.equals("BOFF"))
{
bload1 = false;
}
if (sTag.equals("FON"))
{
bload2 = true;
}
if (sTag.equals("FOFF"))
{
bload2 = false;
}
}
int IndexOf(char msg[], char tag)
{
if (strlen(msg) ==0) return false;
boolean bFlag = false;
int iIndex = -1;
for( int i=0; i<strlen(msg); i++)
{
if(msg[i]== tag)
iIndex = i;
}
return iIndex;
}
boolean compareMessage (char msg[], char tag)
{
if (strlen(msg) ==0) return false;
boolean bFlag = false;
for( int i=0; i<strlen(msg); i++)
{
if(msg[i]== tag)
bFlag = true;
}
return bFlag;
}
void ErrorLED()
{
digitalWrite(errorLED, HIGH);
delay(500);
digitalWrite(errorLED, LOW);
}