Arduino UNO测试BME280温湿度气压传感器

BME280简介

BME280是一个三合一数字环境检测传感器，可以测量所处周围环境的温度、湿度、气压。由于气压随高度变化，可以非常精确地估计高度，因此对于无人机和导航应用来说非常方便。支持IIC和SPI通信接口。

敏感元件	测量范围	误差
温度	-40 to 85 ºC	+/- 1 ºC
湿度	0 to 100% RH	+/- 3 %RH
气压	300 to 1100 hPa	+/- 1 hPa

接口说明

VIN 供电输入正极3.3-5V
GND 供电负极
SCL IIC接口时钟信号输入引脚
SDA IIC接口数据输入输出引脚
电路板中间焊盘为传感器芯片SDO引脚为传感器IIC器件地址设置引脚，默认接GND（1110110）0x76，若需接高电平则需要把中间焊盘和上面焊盘的PCB导线用小刀割断，并用锡连接中间焊盘和下面焊盘，此时器件地址为（1110111）0x77

BME280与Arduino UNO接线与程序

BME280	IIC接线方式
SCL	A5
SDA	A4

Arduino IDE库管理器安装 Adafruit_BME280 library

Arduino IDE库管理器安装Adafruit Unified Sensor

打开示例代码

/***************************************************************************
  This is a library for the BME280 humidity, temperature & pressure sensor

  Designed specifically to work with the Adafruit BME280 Breakout
  ----> http://www.adafruit.com/products/2650

  These sensors use I2C or SPI to communicate, 2 or 4 pins are required
  to interface. The device's I2C address is either 0x76 or 0x77.

  Adafruit invests time and resources providing this open source code,
  please support Adafruit andopen-source hardware by purchasing products
  from Adafruit!

  Written by Limor Fried & Kevin Townsend for Adafruit Industries.
  BSD license, all text above must be included in any redistribution
  See the LICENSE file for details.
 ***************************************************************************/

#include <Wire.h>
#include <SPI.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_BME280.h>

#define BME_SCK 13
#define BME_MISO 12
#define BME_MOSI 11
#define BME_CS 10

#define SEALEVELPRESSURE_HPA (1013.25)

Adafruit_BME280 bme; // I2C
//Adafruit_BME280 bme(BME_CS); // hardware SPI
//Adafruit_BME280 bme(BME_CS, BME_MOSI, BME_MISO, BME_SCK); // software SPI

unsigned long delayTime;

void setup() {
    
    
    Serial.begin(9600);
    while(!Serial);    // time to get serial running
    Serial.println(F("BME280 test"));

    unsigned status;
    
    // default settings
    status = bme.begin();  
    // You can also pass in a Wire library object like &Wire2
    // status = bme.begin(0x76, &Wire2)
    if (!status) {
    
    
        Serial.println("Could not find a valid BME280 sensor, check wiring, address, sensor ID!");
        Serial.print("SensorID was: 0x"); Serial.println(bme.sensorID(),16);
        Serial.print("        ID of 0xFF probably means a bad address, a BMP 180 or BMP 085\n");
        Serial.print("   ID of 0x56-0x58 represents a BMP 280,\n");
        Serial.print("        ID of 0x60 represents a BME 280.\n");
        Serial.print("        ID of 0x61 represents a BME 680.\n");
        while (1) delay(10);
    }
    
    Serial.println("-- Default Test --");
    delayTime = 1000;

    Serial.println();
}


void loop() {
    
     
    printValues();
    delay(delayTime);
}


void printValues() {
    
    
    Serial.print("Temperature = ");
    Serial.print(bme.readTemperature());
    Serial.println(" °C");

    Serial.print("Pressure = ");

    Serial.print(bme.readPressure() / 100.0F);
    Serial.println(" hPa");

    Serial.print("Approx. Altitude = ");
    Serial.print(bme.readAltitude(SEALEVELPRESSURE_HPA));
    Serial.println(" m");

    Serial.print("Humidity = ");
    Serial.print(bme.readHumidity());
    Serial.println(" %");

    Serial.println();
}

打开串口监视器显示出传感器测量的数据

总结

通过本实验能快速直观的使用传感器获取所处环境的参数。