So got a 3.3V BME280 (https://www.amazon.co.uk/dp/B0C7KQY9Q6) and a different library (https://github.com/robert-hh/BME280/) and now getting what I would call 'sensible' values.
I should point out that the library I had before did work with the BME280 but resulted in equally daft numbers.
I did try the BMP280 with 5V and it survived, but I decided not to connect the SCL/SDA to the Pico as they were measuring 5V.
I used to be more involved in electronics when everything ran off 5V TTL levels. It's a bit of a shift
to adapt to 3V3, but as this is the kind of think I'd want to run off a battery it all makes more sense.
Onwards and upwards - thank you for your suggestions and insights.
I should point out that the library I had before did work with the BME280 but resulted in equally daft numbers.
I did try the BMP280 with 5V and it survived, but I decided not to connect the SCL/SDA to the Pico as they were measuring 5V.
I used to be more involved in electronics when everything ran off 5V TTL levels. It's a bit of a shift

Onwards and upwards - thank you for your suggestions and insights.
Statistics: Posted by picoforge — Wed Feb 21, 2024 4:26 pm