bme 280 and nodemcu lolin v3 no readings

[Vladandrei]

Hello,

I am trying to make a weather station and air quality monitor using the bme 280 sensor and nova sds011 .After flashing the nodemcu, i proceeded in wiring the sensor.VCC to 3v,GND to G,Sda to pin d3 and Scl to pin D4.In the debug menu i get the following :

Read bmp280/bme280

Trying bmp280-bme280 sensor on 76......not found

Trying bmp280-bme280 sensor on 77......not found

Check bmp280-bme280 wiring

In other times it shows sensor found but when it comes to displaying the data it does not show the measurements.

I even reflashed the board with an older version.Still i have the same problem.

What could be the cause?

thanks in advance

[Vincent]

From the description,  you are suppose to use the I2C interface. 

In order to use I2C interface correctly,  you need connect CSB of BME280 to VDDIO and connect the SDO pin to either VDDIO (I2C address 0x 77) or GND (I2C address 0x 76). 

Also you should put proper pull up register on the I2C line.  i recommend you to use 4.3K first.

The issue for me looks like you don't put correct HW line connection.