How to Make Computer on off device at home
Circuit:
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#include <SoftwareSerial.h>
//sender phone number with country code
const String PHONE = "ENTER_YOUR_PHONE_HERE";
//GSM Module RX pin to Arduino 3
//GSM Module TX pin to Arduino 2
#define rxPin 2
#define txPin 3
SoftwareSerial sim800(rxPin,txPin);
#define PC 7
String smsStatus,senderNumber,receivedDate,msg;
boolean isReply = false;
void setup() {
digitalWrite(PC, HIGH);
delay(7000);
Serial.begin(115200);
Serial.println("Arduino serial initialize");
sim800.begin(9600);
Serial.println("SIM800L software serial initialize");
pinMode(PC, OUTPUT);
smsStatus = "";
senderNumber="";
receivedDate="";
msg="";
sim800.print("AT+CMGF=1\r"); //SMS text mode
delay(1000);
//delete all sms
sim800.println("AT+CMGD=1,4");
delay(1000);
sim800.println("AT+CMGDA= \"DEL ALL\"");
delay(1000);
}
void loop() {
//////////////////////////////////////////////////
while(sim800.available()){
parseData(sim800.readString());
}
//////////////////////////////////////////////////
while(Serial.available()) {
sim800.println(Serial.readString());
}
//////////////////////////////////////////////////
} //main loop ends
//***************************************************
void parseData(String buff){
Serial.println(buff);
unsigned int len, index;
//////////////////////////////////////////////////
//Remove sent "AT Command" from the response string.
index = buff.indexOf("\r");
buff.remove(0, index+2);
buff.trim();
//////////////////////////////////////////////////
//////////////////////////////////////////////////
if(buff != "OK"){
index = buff.indexOf(":");
String cmd = buff.substring(0, index);
cmd.trim();
buff.remove(0, index+2);
if(cmd == "+CMTI"){
//get newly arrived memory location and store it in temp
index = buff.indexOf(",");
String temp = buff.substring(index+1, buff.length());
temp = "AT+CMGR=" + temp + "\r";
//get the message stored at memory location "temp"
sim800.println(temp);
}
else if(cmd == "+CMGR"){
extractSms(buff);
if(senderNumber == PHONE){
doAction();
//delete all sms
sim800.println("AT+CMGD=1,4");
delay(1000);
sim800.println("AT+CMGDA= \"DEL ALL\"");
delay(1000);
}
}
//////////////////////////////////////////////////
}
else{
//The result of AT Command is "OK"
}
}
//************************************************************
void extractSms(String buff){
unsigned int index;
index = buff.indexOf(",");
smsStatus = buff.substring(1, index-1);
buff.remove(0, index+2);
senderNumber = buff.substring(0, 13);
buff.remove(0,19);
receivedDate = buff.substring(0, 20);
buff.remove(0,buff.indexOf("\r"));
buff.trim();
index =buff.indexOf("\n\r");
buff = buff.substring(0, index);
buff.trim();
msg = buff;
buff = "";
msg.toLowerCase();
}
void doAction(){
if(msg == "pc off"){
digitalWrite(PC, HIGH);
delay(50);
digitalWrite(PC, LOW);
delay(50);
Reply("Your PC has been OFF");
}
else if(msg == "pc on"){
digitalWrite(PC, HIGH);
delay(50);
digitalWrite(PC, LOW);
delay(50);
Reply("Your PC has been ON");
}
smsStatus = "";
senderNumber="";
receivedDate="";
msg="";
}
void Reply(String text)
{
sim800.print("AT+CMGF=1\r");
delay(1000);
sim800.print("AT+CMGS=\""+PHONE+"\"\r");
delay(1000);
sim800.print(text);
delay(100);
sim800.write(0x1A); //ascii code for ctrl-26 //sim800.println((char)26); //ascii code for ctrl-26
delay(1000);
Serial.println("SMS Sent Successfully.");
}
Demo Video: