// Program for attiny3216 to read water level sensor and display it on 4x20 LCD liquid crystal
// created by Jans Hendry
// Universitas Gadjah Mada, Indonesia
// Kamakura Node, Japan
// fab academy MIT - 2022

// the directives/predecessor
#include <Wire.h>
#include <LiquidCrystal_I2C.h>

// create lcd as an object
// format: address, num of columns, num of rows
LiquidCrystal_I2C lcd(0x27, 20, 4);

// sensor pin
const int tp_pin = 4;

void setup() {
  // start serial
  Serial.begin(9600);

  // setting up
  lcd.init();

  // turn on backlight <- the variable resistor has been adjusted
  lcd.backlight();

  // clear screen
  lcd.clear();

  // static display
  defDisplay();

  // delay
  delay(500);
}

void loop() {
  int sensdata = analogRead(tp_pin); // read analogue data 
  //  Serial.print("Sensor reading: ");
  //  Serial.println(sensdata);

  lcd.setCursor(12, 0);
  lcd.print(sensdata); // raw value

  send_sign(sensdata); // turn light indicator
  delay(1000); // take a break every 1 second
}

void defDisplay() {
  lcd.clear(); // clear display

  // static text
  lcd.setCursor(0, 0);
  lcd.print("Read-out ");
  lcd.setCursor(11, 0);
  lcd.print(":");

  lcd.setCursor(0, 1);
  lcd.print("Status");
  lcd.setCursor(11, 1);
  lcd.print(":");
}

int send_sign(int tmp) {
  // turn light
  lcd.setCursor(12, 1);
  if (tmp >= 500) {
    lcd.print("HIGH  ");
  }
  else if (tmp >= 300) {
    lcd.print("MIDDLE");
  }
  else {
    lcd.print("LOW   ");
  }
  return 0;
}