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BME280简介
BME280是一种三合一数字环境检测传感器，可以测量周围环境的温度、湿度和压力。由于压力随高度而变化，高度可以准确估计，因此无人机和导航应用非常方便。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 正极3的电源输入.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 电路板中间焊盘为传感器芯片SDO引脚是传感器IIC设备地址设置引脚，默认连接GND（1110110）0x76.如果需要连接高电平，中间焊盘和上焊盘需要连接PCB导线用小刀切断，中间焊盘和下面的焊盘用锡连接。此时，设备地址为0(111011)x77
BME280与Arduino UNO接线与程序
| BME280 |IIC接线方式 |----------------|-------------------------------|-----------------------------| |SCL|A5| |SDA|A4 | Arduino IDE安装库管理器 Adafruit_BME280 library Arduino IDE安装库管理器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。