// Program for attiny1614 send sensor data to esp32 via uart
// created by Jans Hendry
// Universitas Gadjah Mada, Indonesia
// Kamakura Node, Japan
// fab academy MIT - 2022

String msg = ""; // temporaray variable that stores integer to string
const int readMag = 6;

void setup() {
  Serial.begin(9600); // serial
  pinMode(readMag, INPUT);
}

void loop() {
  int dt = digitalRead(readMag); // sensor read out
  msg = String(dt); // convert to string
  if (!dt) {
    msg = msg + " - on path";
  }
  else {
    msg = msg + " - out of path";
  }
  // Send one by one of the string to ESP32. We cannot send them altogether, as it will
  // change to different character recognized by C
  for (int i = 0; i < msg.length(); i++) {
    Serial.write(msg[i]); // send via UART
  }
  Serial.write('\0'); // special character to say that transmission is complete
  delay(100); // delay should be used, otherwise, the data received in some cases will be cutted or not completed
}