下载类库
- OneWire releases -- v2.3.5
- Arduino-Temperature-Control-Library releases --v3.8.0
我的做法是将下载的压缩包解压，然后将文件放入到项目的目录下,我的ardunio 项目里的文件层级是:
- 37-temp-18b20.ino
- DallasTemperature.cpp
- DallasTemperature.h
- OneWire.cpp
- OneWire.h
- util
-- OneWire_direct_gpio.h
-- OneWire_direct_regtype.h
接线
我使用的是 37 in 1 Sensors Kit for Arduino里面的 TEMP 18B20 模块，三个引脚上面标识: GRY，
G -> 地线,R -> 电源5V,Y -> 2数据库
使用
修改DallasTemperature.h 22行的 #include <OneWire.h> 为 #include "OneWire.h"
//#include <Arduino.h>
//#include "OneWire.h"
#include "DallasTemperature.h"
//G -> GND, R -> VCC,Y -> 2
// 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);
void setup()
{
// start serial port
Serial.begin(9600);
Serial.println("Dallas Temperature IC Control Library Demo");
// Start up the library
sensors.begin();
}
void loop()
{
// call sensors.requestTemperatures() to issue a global temperature
// request to all devices on the bus
Serial.print("开始获取温度...");
sensors.requestTemperatures(); // Send the command to get temperatures
Serial.println("获取完成");
Serial.print("设备1(索引 0),温度是: ");
Serial.println(sensors.getTempCByIndex(0));
delay(1000);
}
//Steinhart-Hart Thermistor 方程的应用
#include <math.h>
double Thermister(int RawADC) {
double Temp;
Temp = log(((10240000/RawADC) - 10000));
Temp = 1 / (0.001129148 + (0.000234125 + (0.0000000876741 * Temp * Temp ))* Temp );
Temp = Temp - 273.15; // Convert Kelvin to Celcius
return Temp;
}