18B20 Arduino Code

//Here's an example code in Arduino that reads the temperature from an 18B20 sensor connected to an Arduino board:
//Note: This code assumes that the 18B20 sensor is connected to pin 2 of the Arduino board. If you're using a different pin, you'll //need to modify the ONE_WIRE_BUS definition accordingly.

#include <OneWire.h>

// Data wire is connected to pin 2
#define ONE_WIRE_BUS 2

OneWire oneWire(ONE_WIRE_BUS);

void setup() {
  Serial.begin(9600);
}

void loop() {
  byte i;
  byte present = 0;
  byte type_s;
  byte data[12];
  byte addr[8];

  // start reading from the 18B20 sensor
  if (!oneWire.search(addr)) {
    Serial.println("No more addresses.");
    oneWire.reset_search();
    delay(250);
    return;
  }

  // check the CRC of the address
  if (OneWire::crc8(addr, 7) != addr[7]) {
    Serial.println("CRC is not valid!");
    return;
  }

  // the first ROM byte indicates which chip
  switch (addr[0]) {
    case 0x10:
      type_s = 1;
      break;
    case 0x28:
      type_s = 0;
      break;
    case 0x22:
      type_s = 0;
      break;
    default:
      Serial.println("Device is not recognized!");
      return;
  }

  // start conversion
  oneWire.reset();
  oneWire.select(addr);
  oneWire.write(0x44, 1);

  // wait for conversion to complete
  delay(1000);

  // read scratchpad
  present = oneWire.reset();
  oneWire.select(addr);
  oneWire.write(0xBE);

  // read data
  for (i = 0; i < 9; i++) {
    data[i] = oneWire.read();
  }

  // convert temperature data
  int16_t raw = (data[1] << 8) | data[0];
  float celsius = (float)raw / 16.0;

  // print temperature
  Serial.print("Temperature: ");
  Serial.print(celsius);
  Serial.println(" °C");

  // delay before reading from the sensor again
  delay(1000);
}