#include <OneWire.h>

#define PIN 12 // DS18B20 PIN
#define SENSORS_AMOUNT 3 

OneWire DS18B20(PIN);

byte addr[8]; // Arrary 64-bit addrress
byte array_sensors[SENSORS_AMOUNT][sizeof(addr)]; // Array of sensors
byte data[12]; // Array data from sensor
byte present = 0;

void setup() {
  

  Serial.begin(9600);
  search_sensors(DS18B20, array_sensors);

  /*
  for(uint8_t i = 0; i < SENSORS_AMOUNT; i++){
    for(uint8_t j = 0; j < 8; j++){
      Serial.print(array_sensors[i][j], HEX);
    }
    Serial.println();
  }
  */
}

// Search sensors and add to array
void search_sensors(OneWire sensor_pin, byte arr_sensors[][sizeof(byte) * 8]){
  uint8_t count = 0;
  byte addr[8];
  
  //Serial.println("Sensors addresses:");
  while(sensor_pin.search(addr)){
    for(uint8_t i = 0; i < 8; i++){
      arr_sensors[count][i] = addr[i];
    }
    count++;
  }
  
  DS18B20.reset_search();
  delay(250);
  return;  
}

void request_temp(OneWire sensor_pin, byte sensor[]){
  sensor_pin.reset();
  sensor_pin.select(sensor);
  sensor_pin.write(0x44, 1);
}

void read_temp(OneWire sensor_pin, byte sensor[], byte data[]){
  sensor_pin.reset();
  sensor_pin.select(sensor);
  sensor_pin.write(0xBE);

  for(uint8_t i = 0; i < 9; i++){
    data[i] = sensor_pin.read();
  //  Serial.print(data[i], HEX);
  }
  //Serial.println();

  int16_t raw = (data[1] << 8) | data[0];
  raw = raw << 3;
  if(data[7] == 0x10){
    raw = (raw & 0XFFF0) + 12 - data[6];
  }
  
  Serial.print(raw / 16.0);
  Serial.print(" ");
}

void loop() {
  // request data from all sensors
  for (uint8_t j = 0; j < SENSORS_AMOUNT; j++){
    request_temp(DS18B20, array_sensors[j]);
  }
  
  // delay from request to get temp about 750 ms
  delay(1000);
  
  // read temperature from all sensors
  for(int8_t i = SENSORS_AMOUNT - 1; i >= 0 ; i--){
    read_temp(DS18B20, array_sensors[i], data);
  }
  Serial.println();
  
  delay(10);
}