Title: Construct the hardware.
In this week, we have to construct the hardware which is Arduino Uno interface LCD, relay and GSM Module SIM900A. All the hardware for this project were construct according from the circuit schematic above.
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| Circuit schematic diagram |
After we complete construct all component, then we continue with the important part which is write the code for upload to the Arduino Uno.
The code for this project
#include <LCD.h>
#include <LiquidCrystal_I2C.h>
#include <SoftwareSerial.h>
#define RELAY1 13
#define RELAY2 12
#define RELAY3 11
SoftwareSerial sim900a(2,3);
LiquidCrystal_I2C lcd(0x27 ,2,1,0,4,5,6,7);
String message,phone;
int data;
void setup()
{
pinMode(RELAY1,OUTPUT);
pinMode(RELAY2,OUTPUT);
pinMode(RELAY3,OUTPUT);
Serial.begin(9600);
sim900a.begin(9600);
digitalWrite(RELAY1,LOW);
digitalWrite(RELAY2,LOW);
digitalWrite(RELAY3,LOW);
/**************LCD*************************/
lcd.begin (16,2);
lcd.setBacklightPin(3,POSITIVE);
lcd.setBacklight(HIGH);
lcd.setCursor(0,0);
lcd.print("GSM Control Home");
lcd.setCursor(0,1);
lcd.print(" Automation ");
delay(2000);
lcd.clear();
lcd.print("Circuit Digest ");
delay(1000);
lcd.setCursor(0,1);
lcd.print("System Ready ");
delay(1000);
lcd.clear();
lcd.setCursor(0,0);
lcd.print(" L1 L2 FAN ");
lcd.setCursor(0,1);
if(digitalRead(RELAY1)==LOW) lcd.print("OFF ");
else lcd.print(" ON ");
if(digitalRead(RELAY2)==LOW) lcd.print(" OFF ");
else lcd.print(" ON ");
if(digitalRead(RELAY3)==LOW) lcd.print(" OFF ");
else lcd.print(" ON ");
}
void loop()
{
if(sim900a.available()>0)
{
delay(100);
message="";
while(sim900a.available())
{
message+=(char)sim900a.read();
data=Serial.read();
}
if (data=='1')
{
Serial.print("RELAY 1 ON");
digitalWrite(RELAY1,HIGH);
lcd.setCursor(0,1);
lcd.print("ON ");
delay(200);
}
if (data=='2')
{
Serial.print("RELAY 1 OFF");
digitalWrite(RELAY1,LOW);
lcd.setCursor(0,1);
lcd.print("OFF ");
delay(200);
}
if (data=='3')
{
Serial.print("RELAY 2 ON");
digitalWrite(RELAY2,HIGH);
lcd.setCursor(7,1);
lcd.print(" ON ");
delay(200);
}
if (data=='4')
{
Serial.print("RELAY 2 OFF");
digitalWrite(RELAY2,LOW);
lcd.setCursor(7,1);
lcd.print("OFF ");
delay(200);
}
if (data=='5')
{
Serial.print("RELAY 3 ON");
digitalWrite(RELAY3,HIGH);
lcd.setCursor(13,1);
lcd.print("ON ");
delay(200);
}
if(data=='6')
{
Serial.print("RELAY 3 OFF");
digitalWrite(RELAY3,LOW);
lcd.setCursor(13,1);
lcd.print("OFF ");
delay(200);
}
if(data=='7')
{digitalWrite(RELAY1,HIGH);
digitalWrite(RELAY2,HIGH);
digitalWrite(RELAY3,HIGH);
lcd.setCursor(13,1);
lcd.print("ON ");
lcd.setCursor(7,1);
lcd.print("ON ");
lcd.setCursor(0,1);
lcd.print("ON ");
delay(200);
}
if(data=='8')
{digitalWrite(RELAY1,LOW);
digitalWrite(RELAY2,LOW);
digitalWrite(RELAY3,LOW);
lcd.setCursor(0,1);
lcd.print("OFF OFF OFF");
delay(200);
}
}
if(message.indexOf("CMT")>-1)
{
message=message.substring(message.indexOf('"')+1);
phone=message.substring(0,message.indexOf('"'));
message=message.substring(message.indexOf('"')+1);
message=message.substring(message.indexOf('"')+1);
message=message.substring(message.indexOf('"')+1);
message=message.substring(message.indexOf('"')+1);
message=message.substring(message.indexOf('"')+1);
message=message.substring(message.indexOf('\n')+1);
message=message.substring(0,message.indexOf('\n')-1);
Serial.print("Message:" + message);
Serial.println(" From:" + phone);
if(phone.length()>=10)
{
if(message=="L1 ON")
{
digitalWrite(RELAY1,HIGH);
Serial.print("RELAY1 ON");//Text message
lcd.setCursor(0,1);
lcd.print("ON ");
delay(200);
}
else if(message=="L1 OFF")
{
digitalWrite(RELAY1,LOW);
Serial.print("RELAY1 OFF");//Text message
lcd.setCursor(0,1);
lcd.print("OFF ");
delay(200);
}
else if(message=="L2 ON")
{
digitalWrite(RELAY2,HIGH);
Serial.print("RELAY2 ON");//Text message
lcd.setCursor(7,1);
lcd.print(" ON ");
delay(200);
}
else if(message=="L2 OFF")
{
digitalWrite(RELAY2,LOW);
Serial.print("RELAY2 OFF");//Text message
lcd.setCursor(7,1);
lcd.print("OFF ");
delay(200);
}
else if(message=="L3 ON")
{
digitalWrite(RELAY3,HIGH);
Serial.print("RELAY3 ON");//Text message
lcd.setCursor(13,1);
lcd.print("ON ");
delay(200);
}
else if(message=="L3 OFF")
{
digitalWrite(RELAY3,LOW);
Serial.print("RELAY3 OFF");//Text message
digitalWrite(RELAY3,LOW);
lcd.setCursor(13,1);
lcd.print("OFF ");
}
else if(message=="ALL ON")
{
digitalWrite(RELAY1,HIGH);
digitalWrite(RELAY2,HIGH);
digitalWrite(RELAY3,HIGH);
Serial.print("ALL RELAY ON");//Text message
lcd.setCursor(0,1);
lcd.print(" ON ON ON");
}
else if(message=="ALL OFF")
{
digitalWrite(RELAY1,LOW);
digitalWrite(RELAY2,LOW);
digitalWrite(RELAY3,LOW);
Serial.print("ALL RELAY OFF");//Text message
lcd.setCursor(0,1);
lcd.print("OFF OFF OFF");
}
else
{
sim900a.print("AT+CMGF=1\r"); //Set text mode
delay(1000);
sim900a.print("AT+CMGS=\"" + phone + "\"\r"); //Send message
delay(1000);
sim900a.print("Arahan salah");//Text message
sim900a.println((char)0x1A); //Ctrl+Z
}
lcd.setCursor(0,1);
if(digitalRead(RELAY1)==LOW) lcd.print("OFF ");
else lcd.print(" ON ");
if(digitalRead(RELAY2)==LOW) lcd.print(" OFF ");
else lcd.print(" ON ");
if(digitalRead(RELAY3)==LOW) lcd.print(" OFF ");
else lcd.print(" ON ");
delay(5000);
}
}
else
{
Serial.println(message);
}
}
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