Arduino Uno 与 18B20温度传感器实验详录

DS18B20 单线数字温度传感器，即“一线器件”，其具有独特的优点：

（ 1 ）采用单总线的接口方式与微处理器连接时仅需要一条口线即可实现微处理器与 DS18B20 的双向通讯。单总线具有经济性好，抗干扰能力强，适合于恶劣环境的现场温度测量，使用方便等优点，使用户可轻松地组建传感器网络，为测量系统的构建引入全新概念。

（ 2 ）测量温度范围宽，测量精度高 DS18B20 的测量范围为 -55 ℃ ~+ 125 ℃ ；在 -10~+ 85°C 范围内，精度为 ± 0.5°C 。

（ 3 ）持多点组网功能多个 DS18B20 可以并联在惟一的单线上，实现多点测温。

（ 4）供电方式灵活 DS18B20 可以通过内部寄生电路从数据线上获取电源。因此，当数据线上的时序满足一定的要求时，可以不接外部电源，从而使系统结构更趋简单，可靠性更高。

（ 5 ）测量参数可配置 DS18B20 的测量分辨率可通过程序设定 9~12 位。

DS18B20 具有体积更小、适用电压更宽、更经济、可选更小的封装方式，更宽的电压适用范围，适合于构建自己的经济的测温系统，因此也就被设计者们所青睐。

产品封装
DS18B20产品封装
时序图
DS18B20时序图
典型应用电路

典型电路
寄生供电方式

支持命令集

复位时序

读写时序

扫描二维码关注公众号，回复： 3277401 查看本文章

具体操作：

1、打开IDE，项目-加载库-管理库，搜索下载安装相应的库，不然程序写好了，编译时会报错；

搜索 18B20 ，看到18B20相关的库，点击安装好，

打开文件-示例，第三方库刚安装好的库，找到第一个例子Alarm；

看到除了DallasTemperature.h，还需要另一个库OneWire.h，再按之前步骤，搜索 OneWire 安装即可；ONE_WIRE_BUS 2 意思是数据口连接开发版引脚pin 2；

2、Arduino 开发版用USB连接电脑，选择对应的开发版和端口，编译上传烧录，

3、接线，必须加电阻，不加电阻检测不到设备；

管脚定义：面朝印字面，左为GND，右为VCC，中间为数字输出引脚（须接上4.7K—10K的上拉电阻）本例4.7K电阻；

BOM表

Arduino Uno *1

18B20温度传感器 *1

4.7K电阻*1

接线

Arduino Uno <------> 18B20温度传感器颜色

Pin 2 <------> DO 白色

5V <------> VCC 红色

GND <------> GND 黄色

Arduino接线图

Arduino接线图.png

4、接好线后，再用USB连接电脑，打开串口监视器查看结果；

Alarm案例代码，可根据需要自行修改：

#include <OneWire.h>
#include <DallasTemperature.h>

// Data wire is plugged into port 2 on the Arduino
#define ONE_WIRE_BUS 2

// Setup a oneWire instance to communicate with any OneWire devices (not just Maxim/Dallas temperature ICs)
OneWire oneWire(ONE_WIRE_BUS);

// Pass our oneWire reference to Dallas Temperature. 
DallasTemperature sensors(&oneWire);

// arrays to hold device addresses
DeviceAddress insideThermometer, outsideThermometer;

void setup(void)
{
  // start serial port
  Serial.begin(9600);
  Serial.println("Dallas Temperature IC Control Library Demo");

  // Start up the library
  sensors.begin();
  
  // locate devices on the bus
  Serial.print("Found ");
  Serial.print(sensors.getDeviceCount(), DEC);
  Serial.println(" devices.");

  // search for devices on the bus and assign based on an index.
  if (!sensors.getAddress(insideThermometer, 0)) Serial.println("Unable to find address for Device 0"); 
  if (!sensors.getAddress(outsideThermometer, 1)) Serial.println("Unable to find address for Device 1"); 

  // show the addresses we found on the bus
  Serial.print("Device 0 Address: ");
  printAddress(insideThermometer);
  Serial.println();

  Serial.print("Device 0 Alarms: ");
  printAlarms(insideThermometer);
  Serial.println();
  
  Serial.print("Device 1 Address: ");
  printAddress(outsideThermometer);
  Serial.println();

  Serial.print("Device 1 Alarms: ");
  printAlarms(outsideThermometer);
  Serial.println();
  
  Serial.println("Setting alarm temps...");

  // alarm when temp is higher than 30C
  sensors.setHighAlarmTemp(insideThermometer, 30);
  
  // alarm when temp is lower than -10C
  sensors.setLowAlarmTemp(insideThermometer, -10);
  
  // alarm when temp is higher than 31C
  sensors.setHighAlarmTemp(outsideThermometer, 31);
  
  // alarn when temp is lower than 27C
  sensors.setLowAlarmTemp(outsideThermometer, 27);
  
  Serial.print("New Device 0 Alarms: ");
  printAlarms(insideThermometer);
  Serial.println();
  
  Serial.print("New Device 1 Alarms: ");
  printAlarms(outsideThermometer);
  Serial.println();
}

// function to print a device address
void printAddress(DeviceAddress deviceAddress)
{
  for (uint8_t i = 0; i < 8; i++)
  {
    if (deviceAddress[i] < 16) Serial.print("0");
    Serial.print(deviceAddress[i], HEX);
  }
}

// function to print the temperature for a device
void printTemperature(DeviceAddress deviceAddress)
{
  float tempC = sensors.getTempC(deviceAddress);
  Serial.print("Temp C: ");
  Serial.print(tempC);
  Serial.print(" Temp F: ");
  Serial.print(DallasTemperature::toFahrenheit(tempC));
}

void printAlarms(uint8_t deviceAddress[])
{
  char temp;
  temp = sensors.getHighAlarmTemp(deviceAddress);
  Serial.print("High Alarm: ");
  Serial.print(temp, DEC);
  Serial.print("C/");
  Serial.print(DallasTemperature::toFahrenheit(temp));
  Serial.print("F | Low Alarm: ");
  temp = sensors.getLowAlarmTemp(deviceAddress);
  Serial.print(temp, DEC);
  Serial.print("C/");
  Serial.print(DallasTemperature::toFahrenheit(temp));
  Serial.print("F");
}

// main function to print information about a device
void printData(DeviceAddress deviceAddress)
{
  Serial.print("Device Address: ");
  printAddress(deviceAddress);
  Serial.print(" ");
  printTemperature(deviceAddress);
  Serial.println();
}

void checkAlarm(DeviceAddress deviceAddress)
{
  if (sensors.hasAlarm(deviceAddress))
  {
    Serial.print("ALARM: ");
    printData(deviceAddress);
  }
}

void loop(void)
{ 
  // call sensors.requestTemperatures() to issue a global temperature 
  // request to all devices on the bus
  Serial.print("Requesting temperatures...");
  sensors.requestTemperatures();
  Serial.println("DONE");

  // Method 1:
  // check each address individually for an alarm condition
  checkAlarm(insideThermometer);
  checkAlarm(outsideThermometer);
/*
  // Alternate method:
  // Search the bus and iterate through addresses of devices with alarms
  
  // space for the alarm device's address
  DeviceAddress alarmAddr;

  Serial.println("Searching for alarms...");
  
  // resetAlarmSearch() must be called before calling alarmSearch()
  sensors.resetAlarmSearch();
  
  // alarmSearch() returns 0 when there are no devices with alarms
  while (sensors.alarmSearch(alarmAddr))
  {
    Serial.print("ALARM: ");
    printData(alarmAddr);
  }
*/

}

参考链接：

【学习笔记】Arduino 与 DS18B20 数字温度传感器联合调试

https://blog.csdn.net/qq_25915701/article/details/81591628

树莓派 GPIO学习笔记(3)--DS18B20温度传感器

https://blog.csdn.net/github_27696095/article/details/45288085

DS18B20温度传感器 - arduino

https://blog.csdn.net/chriz_w/article/details/52098165

Arduino Uno 和 DHT11/DHT22 温湿度传感器

https://blog.csdn.net/ling3ye/article/details/57075416

Arduino Uno 与 18B20温度传感器 实验详录

BOM表

接线

猜你喜欢

Arduino Uno 与 18B20温度传感器实验详录