#include "LedControl.h"
#include "binary.h"

const int TEMP_SENSOR_PIN = A0;
const int LED_BAR_GRAPH_PIN = 2;

#define DIN 3
#define CS 4
#define CLK 5
#define DEV 1        //No of Devices

LedControl lc=LedControl(DIN,CLK,CS,DEV);

void setup() {

  lc.shutdown(0,false);
  lc.setIntensity(0,8);         // Set the brightness (0-15)
  lc.clearDisplay(0);  
}

void loop() { 
  int temp = analogRead(TEMP_SENSOR_PIN);
  float temp_c = (temp - 500) / 10.0;    //Assuming that temperature sensor has a nominal resistance of 10kΩ at 25°C
  
  if (temp_c >= 30.0) {
    lc.setRow(0, 0, 0b11111111);
  } else if (temp_c >= 20.0) {
    lc.setRow(0, 0, 0b11110000);
  } else if (temp_c >= 10.0) {
    lc.setRow(0, 0, 0b11000000);
  } else {
    lc.setRow(0, 0, 0b00000000);
  }
  
  // Display temperature value on MAX7219 matrix
  lc.clearDisplay(1);
  lc.setDigit(1, 3, int(temp_c) / 10, false);
  lc.setDigit(1, 2, int(temp_c) % 10, false);
  lc.setDigit(1, 1, '.', false);
  lc.setDigit(1, 0, int(temp_c * 10) % 10, false);
  
  delay(1000);
}