ESP8266 Community Forum

I try to connect a BME280 sensor to my NodeMCU.
I'm using this library and example sketch: https://github.com/adafruit/Adafruit_BME280_Library

I'm not able to recieve data. The error message:

Could not find a valid BME280 sensor, check wiring!

appeares.

I try to connect by SCL and SDA.
Where do I need to connect the SCL and SDA connections? On what pins?
Or is there somewhere an example sketch to test?
I'm used to use the old BMP180. In that sketch I can define the SCL and SDA pins
by using:


The code dislayed by theBME280 connected to NodeMCU on pins GPIO4 and GPIO5:



chksum is 0x42 (no connection found)
It should be 0x77 or 0x76

By default they are on pins 4(SDA) and 5(SCL).
But you can overwrite those with Wire.begin(0, 2), for exemple, since there are already some pullups on those GPIOs.

martinayotte wrote:By default they are on pins 4(SDA) and 5(SCL).
But you can overwrite those with Wire.begin(0, 2), for exemple, since there are already some pullups on those GPIOs.

Thanks.
I connected SDA and SCL allready to pins 4 and 5.
But then the NodeMCU still not recognizing the BME 280

bme280 can be jumpered for 2 addresses (0x76/0x77). Breakout boards come in both variations.
Check with alternative address (usually defined in .h).

if you use gpio4/5 you should use pullups, not necessarily needed when using gpio0/2.