ds18b20温度传感器代码

以下是ds18b20温度传感器的Arduino代码：

#include <OneWire.h>

// DS18B20 data pin
#define ONE_WIRE_BUS 2

OneWire oneWire(ONE_WIRE_BUS);

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

void loop() {
  byte data[12];
  byte addr[8];

  // Search for a device on the bus
  if (!oneWire.search(addr)) {
    // Resets the search and waits for a new device
    oneWire.reset_search();
    delay(250);
    return;
  }

  // Verify if the device is a DS18B20
  if (addr[0] != 0x28) {
    return;
  }

  // Issue a temperature conversion command
  oneWire.reset();
  oneWire.select(addr);
  oneWire.write(0x44);

  // Wait for conversion to complete (750ms for 12-bit resolution)
  delay(750);

  // Read the scratchpad data
  oneWire.reset();
  oneWire.select(addr);
  oneWire.write(0xBE);

  // Read 9 bytes (scratchpad is 8 bytes + 1 byte for CRC)
  for (int i = 0; i < 9; i++) {
    data[i] = oneWire.read();
  }

  // Verify the CRC
  if (OneWire::crc8(data, 8) != data[8]) {
    Serial.println("CRC Error");
    return;
  }

  // Convert the raw temperature data to Celsius
  int16_t rawTemp = (data[1] << 8) | data[0];
  float celsius = (float)rawTemp / 16.0;

  // Print the temperature in Celsius and Fahrenheit
  Serial.print("Temperature: ");
  Serial.print(celsius);
  Serial.print(" °C, ");
  Serial.print(celsius * 1.8 + 32.0);
  Serial.println(" °F");
}

这个代码使用了OneWire库来与DS18B20温度传感器进行通信。它通过搜索总线上的所有设备来查找DS18B20，然后发送温度转换命令并等待转换完成。接下来，它读取DS18B20的scratchpad数据并验证CRC，然后将原始温度数据转换为摄氏温度并打印输出。