#include <MAX31855.h>
//#include <SoftwareSerial.h>
// Pin connections to the MAX31855x8 board 
// The power requirement for the board is less than 2mA.  Most microcontrollers can source or sink a lot more
// than that one each I/O pin.  For example, the ATmega328 supports up to 20mA.  For convenience, the board
// is placed directly on top of a row of I/O pins on the microcontroller.  Power is supplied to the board by
// holding the GND pin low and the VIN pin high
#define GND  3
#define T0   4
#define T1   5
#define T2   6
#define VIN  7
#define MISO 8
#define CS   9
#define SCK  10

// Create the temperature object, defining the pins used for communication
MAX31855 temp = MAX31855(MISO, CS, SCK);

void setup() {
  // Display temperatures using the serial port
  Serial.begin(9600);
  
  // Initialize pins
  pinMode(GND, OUTPUT);
  pinMode(T0, OUTPUT);
  pinMode(T1, OUTPUT);
  pinMode(T2, OUTPUT);
  pinMode(VIN, OUTPUT);
  
  // Power up the board
  digitalWrite(GND, LOW);
  digitalWrite(VIN, HIGH);
  delay(200);
}


void loop () {
 
  // Display the junction temperature
  float temperature = temp.readJunction(CELSIUS);
  Serial.print("J=");
  printTemperature(temperature);
    
  // Display the temperatures of the 8 thermocouples
  for (int therm=0; therm<8; therm++) {
    // Select the thermocouple
    digitalWrite(T0, therm & 1? HIGH: LOW);
    digitalWrite(T1, therm & 2? HIGH: LOW);
    digitalWrite(T2, therm & 4? HIGH: LOW);
    // The MAX31855 takes 100ms to sample the thermocouple.
    // Wait a bit longer to be safe.  We'll wait 0.125 seconds
    delay(1000);
    
    temperature = temp.readThermocouple(CELSIUS);
    if (temperature == FAULT_OPEN)
        continue;
    Serial.print(" T");
    Serial.print(therm);
    Serial.print("=");
    printTemperature(temperature);
  }
  
  Serial.println();
}


// Print the temperature, or the type of fault
void printTemperature(double temperature) {
  switch ((int) temperature) {
    case FAULT_OPEN:
      Serial.print("FAULT_OPEN");
      break;
    case FAULT_SHORT_GND:
      Serial.print("FAULT_SHORT_GND");
      break;
    case FAULT_SHORT_VCC:
      Serial.print("FAULT_SHORT_VCC");
      break;
    case NO_MAX31855:
      Serial.print("NO_MAX31855");
      break;
    default:
      Serial.print(temperature);
      break;
  }
  Serial.print(" ");
}