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finitespace / BME280

Provides an Arduino library for reading and interpreting Bosch BME280 data over I2C, SPI or Sw SPI.
GNU General Public License v3.0
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BME280 or BMP280 #93

Closed Delivator closed 6 years ago

Delivator commented 6 years ago

Expected behavior

See a humidity value

Actual behavior

Sensor gets detected as BMP280 and it show 0.00% RH

I bought this sensor from ebay (https://www.ebay.de/itm/Blue-Digital-Barometric-Pressure-Sensor-Board-BME280-I2C-SPI-BMP280-3-3V-AIP/142636813700) and thought that I bought a BME280 sensor, but now im not sure. How can I see if this is a BME280 or a BMP280? On the board and in the product title it says both.

gartfr commented 6 years ago

You probalbly bough a BMP280 by error. The basic example program provided with this lib is able to differentiate the BMP from BME using the ChipModel_ function from the lib like this :

switch(bme.chipModel()) { case BME280::ChipModel_BME280: Serial.println("Found BME280 sensor! Success."); break; case BME280::ChipModel_BMP280: Serial.println("Found BMP280 sensor! No Humidity available."); break; default: Serial.println("Found UNKNOWN sensor! Error!");

So, try to run this example (BME_280_I2C_Test or BME_280_SPI_Test depending your sketch) and check the first line of the serial output and you'll be fixed.

From my experience I ran BMP280 with this lib and I have this behaviour. RH=0.00%.

Delivator commented 6 years ago

Yeah that's exactly what happened! I contacted the seller and he confirmed that it was a BMP280.