Arduino Sketch for Fridgeye App on Nextion Display

fridgeye_nextion.ino

// Include the Nextion Arduino library
#include "Nextion.h"

long lastUpdate;
int SENSOR = A0; // Alias A0 as SENSOR

// t0 element from the Nextion GUI Editor was on
// page 0 with an id of 2.
NexText t0 = NexText(0, 2, "t0"); 

// Function to read the value of the photoresistor
// and map the value from 0-1024 to the range 0-100
// and display it on the screen in the t0 element
void checkSensor()
{
  int val = map(analogRead(SENSOR), 0, 1024, 0, 100);
  String displayText = String(val) + "%";  
  t0.setText(displayText.c_str());
}

void setup(void)
{
  lastUpdate = millis();
  pinMode(SENSOR, INPUT);
  nexInit();
}

void loop(void)
{
  nexLoop(NULL); // Service the Nextion display

  // Check the light level every 100ms
  if (millis() - lastUpdate > 100)
  {
    checkSensor();
    lastUpdate = millis();
  }
}