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Module : Atmospheric Pressure (+Temperature and altitude sensor)

With this module you can know the atmospheric pressure, the temperature and the altitude.

We use a BMP280 sensor connected on I2C. Because we have another module for temperature with a better precision, we are going to put this one inside the weather station. So the temperature will be the "inside" temperature around the ESP core.

Good guide

See a good guide from adafruit here : https://learn.adafruit.com/adafruit-bmp280-barometric-pressure-plus-temperature-sensor-breakout/overview

Warning : if you use a clone of the "adafruit" BMP280 sensor

If like me, you use a clone (chinese) version of the BMP280 sensor, you may have a different I2C address for the component. Normally the adafruit BMP280 use the address "0x77" as you can see here in the lib : https://github.com/adafruit/Adafruit_BMP280_Library/blob/master/Adafruit_BMP280.h#L37 In my case the address is : 0x76

To find your address, use an I2C scanner on the ESP8266 : tools/i2c_scanner After this operation, I simply change the address use by the library by doing this :

#define BMP280_I2C_ADDRESS 0x76

// ....

void initBarrometricSensor() {
  if (!bmp.begin(BMP280_I2C_ADDRESS)) {  
    Serial.println("Could not find a valid BMP280 sensor, check wiring!");
  }
}

Images

Module directly wired to the ESP8266

Module

Components

  • 1 BMP280 (0.85 euro)

Schema

BMP280 connection

Required libraries

  • Search in arduino IDE the library "Adafruit Unified Sensor" And "Adafruit BMP280 Library" and install them.

Tests

Use the code Basic reading BMP280 to test the module. This code will just continuously ask the module the value of pressure, temperature and altitude.