A Plan9 / 9Front file system for the scd40 co2 sensor
Writen to work with this sensor sold by adafruit https://www.adafruit.com/product/5187 manufactures website https://sensirion.com/products/catalog/SCD40/
Usage; scd40fs -m mountpoint -s srvname
if no arguments are given, the default mount point is /mnt and the default srv name, and name of the directory, is scd40
the mounted directory will contain 4 files "all" lists the CO₂, temperature in celcius, and relative humidity, in a readable format. "CO₂", "tempC", and "RH" each output their respective data as just a number.