michaelh/environ
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Michael Hope 487ee96243 environ: reformat the README
2024-09-21 18:50:42 +00:00
bthome.py environ: reads the SCD40 and sends over BTHome 2024-09-21 17:29:47 +00:00
m5paper.py environ: reads the SCD40 and sends over BTHome 2024-09-21 17:29:47 +00:00
main.py environ: add deep sleep 2024-09-21 18:47:39 +00:00
Makefile environ: reads the SCD40 and sends over BTHome 2024-09-21 17:29:47 +00:00
README.md environ: reformat the README 2024-09-21 18:50:42 +00:00
scd40.py environ: reads the SCD40 and sends over BTHome 2024-09-21 17:29:47 +00:00

README.md

Environ

This project uses a ESP32 to expose a SCD40 CO2, temperature, and humidity sensor to Home Assistant via the BTHome Bluetooth protocol.

Hardware

v1 uses a M5Stack M5Paper that I had spare. It's a large unit, and most of the hardware is unused, but it does come with a built-in battery and low power support.

Schematic: https://m5stack.oss-cn-shenzhen.aliyuncs.com/resource/docs/schematic/Core/m5paper/M5_PAPER_SCH.pdf

Pins:

  • I2C: SDA: G21, SCL: G22

    • GT911 touch controller
    • SHT30 humidity, temperature
    • BM8563 RTC
    • FM24C02 EEPROM

  • Port A I2C: G25, G32

    • SCD40

  • Power control:

    • PS_ON G2
    • EPD_PWR_EN G23
    • EXT_PWR_EN G5
    • VBAT_S G35 via a 3k / 11 k divider

  • Others

    • IT8951E
    • SD card
    • 3 buttons