MCU_serial

#include <SoftwareSerial.h>

//Variable softwareSerial (Rx, Tx)
SoftwareSerial DataSerial(D4, D3);

//Millis pengganti delay
unsigned long previousMillis = 0;
const long interval = 5000;

//variable penampung data array
String arrData[3];

void setup() {
  Serial.begin(9600);
  DataSerial.begin(9600);

}

void loop() {
  //konfig millis
  unsigned long currentMillis = millis(); //baca millis saat ini
  if(currentMillis - previousMillis >= interval)
  {
    //update previousMillis
    previousMillis = currentMillis;

    //Baca data dari UNO
    //baca data serial
    String data = "";
    while(DataSerial.available()>0)
    {
      data += char(DataSerial.read());
    }
    //buang spasi data
    data.trim();

    //uji data
    if(data != "")
    {
      //pemecahan data
      int index = 0;
      for(int i=0; i<= data.length(); i++)
      {
        char delimiter = '#';
        if(data[i] != delimiter)
          arrData[index] += data[1];
        else
          index++; //variabel index bertambah 1
      }
      //pastikan data dikirim lengkap
      //urutan index 0=ppm, 1=temp, 2=ecpump
      if (index == 2)
      {
        //tampilkan nilai ke serial
        Serial.println("ppm: " + arrData[0]);
        Serial.println("Temp: " + arrData[1]);
        Serial.println("EcPump: " + arrData[2]);
        Serial.println();
      }
      arrData[0] = "";
      arrData[1] = "";
      arrData[2] = "";
    }
    //Reques data ke uno
    DataSerial.println("Ya");
  }

}