esp32 sensor stuff

Read some sensors (currently only BME280 and SCD30), display some values, use MQTT to publish some other values.

Missing stuff

some sort of modularization (how does upip wörk?)
some sort of configuration
- wifi (Connect to multiple ones?)
- sensors (Detect connected ones?)
- mqtt (Server and publish config)

Name		Name	Last commit message	Last commit date
Latest commit History 7 Commits
max7219		max7219
README.md		README.md
bme280.py		bme280.py
main.py		main.py
mqtt.py		mqtt.py
scd30.py		scd30.py
timer.py		timer.py