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Sensor box v1

Final result

Objective

Create a system capable of collecting environmental data and sending it to an MQTT broker by connecting to WiFi.

Data to collect

  • temperature (AHT20)
  • humidity (AHT20)
  • air quality (PMS7003, SGP30)
  • atmospheric pressure (BMP180)

Power supply

  • 3.3V lithium battery
  • solar panel

Operation

Every 60 seconds, the system wakes up from a sleep state, checks the WiFi connection, collects and sends data to the MQTT broker. During the interval of time between one transmission and the next, the system goes into a sleep state to consume as little energy as possible.

Topics MQTT

  • box01/temperature (float, °C)
  • box01/humidity (int, %)
  • box01/pressure (int, Pa)
  • box01/caqi (int)
  • box01/pm01 (int, ug/m3)
  • box01/pm25 (int, ug/m3)
  • box01/pm100 (int, ug/m3)
  • box01/eco2 (int, ppm)
  • box01/tvoc (int, ppb)
  • box01/h2 (int, ppm)
  • box01/ethanol (int, ppm)

Circuit Diagram

Breadboard view

Hardware used

  • Raspberry Pi Pico W (RP2040) or ESP32
  • AHT20
  • BMP180
  • PMS7003
  • SGP30
  • Step-up converter 3.3 V - 5 V
  • Solar panel
  • CN3065
  • 3.3V lithium battery

License

MIT License

Authors

Notes

  • Currently, the DORMANT state isn't used because it doesn't work correctly.