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robert-hh / BME280

Micropython driver for the BME280 sensor, target platform Pycom devices
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I2C bus error #3

Closed jhn4 closed 4 years ago

jhn4 commented 4 years ago

I'm using pycom's FiPy and got the I2C bus error when using your example code on the the combined CSS811/BME280 enviromental sensor. I fixed it however by changing the BME280 default adress from 0x76 to 0x77, i don't know if it's the combined sensor that have this changed or if the mistake is in your code. However maybe you can add a comment or somthing to make life easier for other people! Chnaged to this:

BME280 default address.

BME280_I2CADDR = 0x77

//J

robert-hh commented 4 years ago

The I2C-Address of the BME280 is 0x76 or 0x77, depending on the value of its SDO pin. That one is sometimes hardwired, sometimes available on a breakout board pin. At the breakout board I used a solder bridge is foreseen to change the address. It is common for I2C devices to have several configurable addresses.