General • Re: Pico W with GYBMEP BME/BMP280

Last year I bought some of these: https://www.amazon.co.uk/gp/product/B08ZMNR1J5/ and finally got to play with them
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What's your thinking?

Since the web page says 5V in multiple places, I would believe that to be true. I have the Adafruit modules for BME280 and BMP280 that I connect to VSYS 5V.

What's not clear to me is if your device already has pullups for SDA and SCL; probably not, but you should trace the signals to see if there are any resistors on SDA and SCL to Vcc on the board. If not, you need to add them in your circuit. Some people say 10K, others say 4.7K; I go with the 10K and haven't had any issues.

Now, I have 4 connected simultaneously to a pico; they are positioned side by side, and yet do not read out the exact same values, especially pressure. The readings are all within +/- specs, but that doesn't mean that they all will read exactly the same. Not an issue for most applications, but it is for my application, and I haven't yet come up with a calibration strategy. If it's for a weather station, then does it really matter if it's fractionally off from the local weather report?

I don't know ( you didn't say ) what software you're using... C SDK or Micro-Python. If C, then I hope you've downloaded the Bosch drivers that read and use the factory calibration values.

Statistics: Posted by picoforge — Tue Feb 20, 2024 1:48 pm