//const byte code[]= {0x01, 0x03, 0x00, 0x1e, 0x00, 0x03, 0x65, 0xCD};
const byte nitro[] = {0x01,0x03, 0x00, 0x1e, 0x00, 0x01, 0xe4, 0x0c};
const byte phos[] = {0x01,0x03, 0x00, 0x1f, 0x00, 0x01, 0xb5, 0xcc};
const byte pota[] = {0x01,0x03, 0x00, 0x20, 0x00, 0x01, 0x85, 0xc0};

byte values[11];
#define RXD1 33
#define TXD1 25


void setup() {
  Serial.begin(115200);
  Serial1.begin(9600, SERIAL_8N1, RXD1, TXD1);
  delay(3000);
}

void loop() {
  byte val1,val2,val3;
  val1 = nitrogen();
  delay(250);
  val2 = phosphorous();
  delay(250);
  val3 = potassium();
  delay(250);


  Serial.print("Nitrogen: ");
  Serial.print(val1);
  Serial.println(" mg/kg");
  Serial.print("Phosphorous: ");
  Serial.print(val2);
  Serial.println(" mg/kg");
  Serial.print("Potassium: ");
  Serial.print(val3);
  Serial.println(" mg/kg");
  delay(2000);

  }

byte nitrogen(){
  //digitalWrite(DE,HIGH);
  //digitalWrite(RE,HIGH);
  delay(10);
  if(Serial1.write(nitro,sizeof(nitro))==8){
    //digitalWrite(DE,LOW);
    //digitalWrite(RE,LOW);
    for(byte i=0;i<7;i++){
    //Serial.print(Serial1.read(),HEX);
    values[i] = Serial1.read();
    Serial.print(values[i],HEX);
    }
    Serial.println();
  }
  return values[4];
}

byte phosphorous(){
  //digitalWrite(DE,HIGH);
  //digitalWrite(RE,HIGH);
  delay(10);
  if(Serial1.write(phos,sizeof(phos))==8){
    //digitalWrite(DE,LOW);
    //digitalWrite(RE,LOW);
    for(byte i=0;i<7;i++){
    //Serial.print(Serial1.read(),HEX);
    values[i] = Serial1.read();
    Serial.print(values[i],HEX);
    }
    Serial.println();
  }
  return values[4];
}

byte potassium(){
  //digitalWrite(DE,HIGH);
  //digitalWrite(RE,HIGH);
  delay(10);
  if(Serial1.write(pota,sizeof(pota))==8){
    //digitalWrite(DE,LOW);
    //digitalWrite(RE,LOW);
    for(byte i=0;i<7;i++){
    //Serial.print(Serial1.read(),HEX);
    values[i] = Serial1.read();
    Serial.print(values[i],HEX);
    }
    Serial.println();
  }
  return values[4];
}