sainsmart 8 channel relay control

relay_control.cpp

volatile byte relayState = LOW;
long lastDebounceTime = 0;
long debounceDelay = 1000;
void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
pinMode(2,OUTPUT);
pinMode(3,OUTPUT);
pinMode(4,OUTPUT);
pinMode(5,OUTPUT);
pinMode(6,OUTPUT);
pinMode(7,OUTPUT);
pinMode(8,OUTPUT);
pinMode(9,OUTPUT);


digitalWrite(2,HIGH);
digitalWrite(3,HIGH);
digitalWrite(4,HIGH);
digitalWrite(5,HIGH);
digitalWrite(6,HIGH);
digitalWrite(7,HIGH);
digitalWrite(8,HIGH);
digitalWrite(9,HIGH);

}

void loop() {
  // put your main code here, to run repeatedly
String readString;
String Q;


 while (Serial.available()){
  delay(1);
  if(Serial.available()>0){
  char c = Serial.read();
   if (isControl(c)){
  break;
  }
  readString += c;
  }
 }
if((millis() - lastDebounceTime) > debounceDelay && relayState == HIGH){
  Q = readString;
  if (Q=="off1"){
    digitalWrite(2,HIGH);
    relayState = LOW;
    Serial.println("OFF1");
   }
  delay(50);
}
if((millis() - lastDebounceTime) > debounceDelay && relayState == LOW){
  Q = readString;
  if (Q=="on1"){
    digitalWrite(2,LOW);
    relayState = HIGH;
    Serial.println("ON1");
   }
  delay(50);
}
if (Q=="read1"){
  Serial.println (digitalRead(2), DEC);
}
if((millis() - lastDebounceTime) > debounceDelay && relayState == HIGH){
  Q = readString;
  if (Q=="off2"){
    digitalWrite(3,HIGH);
    relayState = LOW;
    Serial.println("OFF2");
   }
  delay(50);
}
if((millis() - lastDebounceTime) > debounceDelay && relayState == LOW){
  Q = readString;
  if (Q=="on2"){
    digitalWrite(3,LOW);
    relayState = HIGH;
    Serial.println("ON2");
   }
  delay(50);
}
if (Q=="read2"){
  Serial.println (digitalRead(3), DEC);
}
if((millis() - lastDebounceTime) > debounceDelay && relayState == HIGH){
  Q = readString;
  if (Q=="off3"){
    digitalWrite(4,HIGH);
    relayState = LOW;
    Serial.println("OFF3");
   }
  delay(50);
}
if((millis() - lastDebounceTime) > debounceDelay && relayState == LOW){
  Q = readString;
  if (Q=="on3"){
    digitalWrite(4,LOW);
    relayState = HIGH;
    Serial.println("ON3");
   }
  delay(50);
}
if (Q=="read3"){
  Serial.println (digitalRead(4), DEC);
}
if((millis() - lastDebounceTime) > debounceDelay && relayState == HIGH){
  Q = readString;
  if (Q=="off4"){
    digitalWrite(5,HIGH);
    relayState = LOW;
    Serial.println("OFF4");
   }
  delay(50);
}
if((millis() - lastDebounceTime) > debounceDelay && relayState == LOW){
  Q = readString;
  if (Q=="on4"){
    digitalWrite(5,LOW);
    relayState = HIGH;
    Serial.println("ON4");
   }
  delay(50);
}
if (Q=="read4"){
  Serial.println (digitalRead(5), DEC);
}
if((millis() - lastDebounceTime) > debounceDelay && relayState == HIGH){
  Q = readString;
  if (Q=="off5"){
    digitalWrite(6,HIGH);
    relayState = LOW;
    Serial.println("OFF5");
   }
  delay(50);
}
if((millis() - lastDebounceTime) > debounceDelay && relayState == LOW){
  Q = readString;
  if (Q=="on5"){
    digitalWrite(6,LOW);
    relayState = HIGH;
    Serial.println("ON5");
   }
  delay(50);
}
if (Q=="read5"){
  Serial.println (digitalRead(6), DEC);
}
if((millis() - lastDebounceTime) > debounceDelay && relayState == HIGH){
  Q = readString;
  if (Q=="off6"){
    digitalWrite(7,HIGH);
    relayState = LOW;
    Serial.println("OFF6");
   }
  delay(50);
}
if((millis() - lastDebounceTime) > debounceDelay && relayState == LOW){
  Q = readString;
  if (Q=="on6"){
    digitalWrite(7,LOW);
    relayState = HIGH;
    Serial.println("ON6");
   }
  delay(50);
}
if (Q=="read6"){
  Serial.println (digitalRead(7), DEC);
}
if((millis() - lastDebounceTime) > debounceDelay && relayState == HIGH){
  Q = readString;
  if (Q=="off7"){
    digitalWrite(8,HIGH);
    relayState = LOW;
    Serial.println("OFF7");
   }
  delay(50);
}
if((millis() - lastDebounceTime) > debounceDelay && relayState == LOW){
  Q = readString;
  if (Q=="on7"){
    digitalWrite(8,LOW);
    relayState = HIGH;
    Serial.println("ON7");
   }
  delay(50);
}
if (Q=="read7"){
  Serial.println (digitalRead(8), DEC);
}
if((millis() - lastDebounceTime) > debounceDelay && relayState == HIGH){
  Q = readString;
  if (Q=="off8"){
    digitalWrite(9,HIGH);
    relayState = LOW;
    Serial.println("OFF8");
   }
  delay(50);
}
if((millis() - lastDebounceTime) > debounceDelay && relayState == LOW){
  Q = readString;
  if (Q=="on8"){
    digitalWrite(9,LOW);
    relayState = HIGH;
    Serial.println("ON8");
   }
  delay(50);
}
if (Q=="read8"){
  Serial.println (digitalRead(9), DEC);
}
}