Station Meteo

A multi-points, LoRa-based weather monitoring system.

Comprises:

• base station: display + Temp, humidity and CO2 sensors
• outdoor satellite: Temp, humidity and pressure sensors
• indoor satellite: Temp, humidity and CO2 sensors

Notes

• Satellites to capture sensor values every 5 min and send to base over LoRa 433MHz
• Base updates screen every 5min
• battery-operated
• base, outdoor and indoor sats all have different firmwares.
• Display: 1 line per satellite, with freshness indicator (whether measure was received over last X min)

TODO

• circuit diagrams
• breakout builds
• code
• assembly
• shells
• PCB

BOM

Type	Name	Refs
Microcontroller	Heltec CubeCell HTCC-AB02A	https://heltec.org/project/htcc-ab02a/?attribute_pa_band=433mhz
Temp & humidity sensor	AHT20	https://www.adafruit.com/product/4566
CO2 sensor	SCD40	https://www.adafruit.com/product/5187
Pressure sensor	LPS22HB	https://www.adafruit.com/product/4633
screen	eInk 2.13" monochrome 250x122 (SSD1680)	https://www.adafruit.com/product/4197

More parts

• SMA right angle connectors
• ribbon cables

Parts documentation

Name	Url
AHT20	https://asairsensors.com/wp-content/uploads/2021/09/Data-Sheet-AHT20-Humidity-and-Temperature-Sensor-ASAIR-V1.0.03.pdf
LPS22HB	https://www.mouser.fr/pdfdocs/enDM00140895.pdf
SCD40	https://sensirion.com/media/documents/48C4B7FB/64C134E7/Sensirion_SCD4x_Datasheet.pdf
Screen	https://learn.adafruit.com/adafruit-2-13-eink-display-breakouts-and-featherwings
CubeCell	https://resource.heltec.cn/download/CubeCell/HTCC-AB02A/HTCC-AB02A_PinoutDiagram.pdf https://docs.heltec.org/en/node/asr650x/htcc_ab02/index.html

Setup

• Create a symlink for each library:

ln -s ~/dev/station-meteo/sketches/libraries/aht20 ~/dev/station-meteo/sketches/libraries/lps22hb ~/Arduino/libraries/