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CODE
String inputs;
#define relay1 2 //Connect relay1 to pin 9 #define relay2 3 //Connect relay2 to pin 8 #define relay3 4 //Connect relay3 to pin 7 #define relay4 5 //Connect relay4 to pin 6 #define relay5 6 //Connect relay5 to pin 5 #define relay6 7 //Connect relay6 to pin 4 #define relay7 8 //Connect relay7 to pin 3 #define relay8 9 //Connect relay8 to pin 2 void setup() { Serial.begin(9600); //Set rate for communicating with phone pinMode(relay1, OUTPUT); //Set relay1 as an output pinMode(relay2, OUTPUT); //Set relay2 as an output pinMode(relay3, OUTPUT); //Set relay1 as an output pinMode(relay4, OUTPUT); //Set relay2 as an output pinMode(relay5, OUTPUT); //Set relay1 as an output pinMode(relay6, OUTPUT); //Set relay2 as an output pinMode(relay7, OUTPUT); //Set relay1 as an output pinMode(relay8, OUTPUT); //Set relay2 as an output digitalWrite(relay1, LOW); //Switch relay1 off digitalWrite(relay2, LOW); //Swtich relay2 off digitalWrite(relay3, LOW); //Switch relay1 off digitalWrite(relay4, LOW); //Swtich relay2 off digitalWrite(relay5, LOW); //Switch relay1 off digitalWrite(relay6, LOW); //Swtich relay2 off digitalWrite(relay7, LOW); //Switch relay1 off digitalWrite(relay8, LOW); //Swtich relay2 off } void loop() { while(Serial.available()) //Check if there are available bytes to read { delay(10); //Delay to make it stable char c = Serial.read(); //Conduct a serial read if (c == '#'){ break; //Stop the loop once # is detected after a word } inputs += c; //Means inputs = inputs + c } if (inputs.length() >0) { Serial.println(inputs); if(inputs == "A") { digitalWrite(relay1, LOW); } else if(inputs == "a") { digitalWrite(relay1, HIGH); } else if(inputs == "B") { digitalWrite(relay2, LOW); } else if(inputs == "b") { digitalWrite(relay2, HIGH); } else if(inputs == "C") { digitalWrite(relay3, LOW); } else if(inputs == "c") { digitalWrite(relay3, HIGH); } else if(inputs == "D") { digitalWrite(relay4, LOW); } else if(inputs == "d") { digitalWrite(relay4, HIGH); } else if(inputs == "E") { digitalWrite(relay5, LOW); } else if(inputs == "e") { digitalWrite(relay5, HIGH); } else if(inputs == "F") { digitalWrite(relay6, LOW); } else if(inputs == "f") { digitalWrite(relay6, HIGH); } else if(inputs == "G") { digitalWrite(relay7, LOW); } else if(inputs == "g") { digitalWrite(relay7, HIGH); } else if(inputs == "H") { digitalWrite(relay8, LOW); } else if(inputs == "h") { digitalWrite(relay8, HIGH); } inputs=""; } }