#include <OneWire.h>





void setup() {

  Serial.begin(115200);


  setResolution(4);
  dallas(4, 1);

}

void loop() {



  unsigned long time = micros();
  float celsius = dallas(4, 0);
  time = micros() - time;

  Serial.print(celsius, 5);
  Serial.print("  ");
  Serial.print(time);
  Serial.println();

  delay(1000);
}

float dallas(int x, byte start)
{
  OneWire ds(x);

  byte data[9];
  float celsius;

  do {
    ds.reset();
    ds.write(0xCC); // 0xCC = Skip ROM — address all devices on the bus
    ds.write(0xBE); // 0xBE = Read Scratchpad command, to read data from the sensor's memory.

    for (byte  i = 0; i < 9; i++) { // we need 9 bytes
      data[i] = ds.read();
    }
    int16_t  raw = (data[1] << 8) | data[0];
    raw = raw << 3;
    if (data[7] == 0x10) {
      // "count remain" gives full 12 bit resolution
      raw = (raw & 0xFFF0) + 12 - data[6];
    }
    ds.reset();
    ds.write(0xCC); // 0xCC = Skip ROM — address all devices on the bus
    ds.write(0x44, 1); // 0x44 = Start temperature conversion, 0 = no parasite power, 1 = with parasite power
    if (start) delay(1000);

    celsius = (float)raw / 16.0;
  } while (start--);

  return celsius;
}


void setResolution(int x) {
  OneWire ds(x);
  // Resolution value (choose one of these):
  // 9-bit:  0x1F ~93.75 ms
  // 10-bit: 0x3F ~187.5 ms
  // 11-bit: 0x5F ~375 ms
  // 12-bit: 0x7F ~750 ms

  byte addr[8];

  ds.reset();
  ds.write(0xCC);     // 0xCC = Skip ROM — address all devices on the bus
  ds.write(0x4E);     // 0x4E = Write Scratchpad command
  ds.write(0);        // TH register (user-defined alarm high threshold, unused here)
  ds.write(0);        // TL register (user-defined alarm low threshold, unused here)
  ds.write(0x3F);     // Configuration register — sets resolution to 10-bit

  // Optionally: copy scratchpad to EEPROM
  ds.reset();
  ds.write(0xCC);     // 0xCC = Skip ROM — address all devices on the bus
  ds.write(0x48);     // 0x48 = Copy Scratchpad to EEPROM
}