ESP32 Environmental Sensors
esp32 board

Wifi and Bluetooth air quality monitoring sensors built with ESP32 dev boards.

These firmwares are providing both a wifi web interface and a documented BLE API to use with WatchFlower. They use standard libraries and are easy to customize.

GitHub
esp32

HiGrow

HiGrow is a plant monitoring sensor platform using ESP32 chips. They are available on a couple of Chinese brands like LilyGo or Wemos.

I would not recommend an HiGrow board for any serious plant monitoring, but only for tinkering with an ESP32 board with onboard sensors. However if you already have one, this firmware might be useful!

Documentation, firmware code and 3D printed parts on the GitHub repository
esp32 board

Capabilities:

  • Temperature
  • Humidity
  • Light intensity
  • Soil moisture
  • Soil fertility
  • Battery charging and monitoring

Dependencies:

  • Arduino IDE
  • ESP32 platform plugin
  • ESPDash (v3)
    • AsyncTCP
    • Arduino JSON
  • Button2 library
  • BH1750 library
  • DHT library (for DTH11, DTH21, DTH22)
  • DHT12 library (for DHT12)

ESP32 settings:

  • 80 MHz CPU and 40 MHz flash frequencies are fine
  • 2 MB APP and 2 MB FATFS partition scheme is requiered

Geiger Counter

esp32

ESP32 board with a "CAJOE" Geiger Counter module designed not for portable handheld measurements, but for long term ambient radiation monitoring.

The CAJOE is a popular open source module with a Geiger Müller tube used for the detection of ionizing radiation.

“3.6 Roentgen. Not great, not terrible.”
You might not be planning on going to Chernobyl, but Chernobyl might just come to you...

Documentation, firmware code and 3D printed parts on the GitHub repository
esp32 board

Capabilities:

  • Event count (detect ionising event due to a radiation particle)
  • Event count per second
  • Radiation levels (µSv/s)
  • Radiation levels (µSv/m)
  • Radiation status (OK > careful > you're gonna die)

Dependencies:

  • Arduino IDE
  • ESP32 platform plugin
  • ESPDash (v3)
    • AsyncTCP
    • Arduino JSON
  • Button2 library

ESP32 settings:

  • 80 MHz CPU and 40 MHz flash frequencies are fine
  • 2 MB APP and 2 MB FATFS partition scheme is requiered
esp32

Air Quality Monitor

ESP32 board with many, many air quality monitoring sensors.

The goal is to study our indoor air quality. This one is still a big work in progress.

Capabilities:

  • Temperature
  • Humidity
  • Barometer
  • Light sensor
  • UV light sensor
  • Ambiant sound level
  • O2 sensor
  • O3 sensor
  • CO sensor
  • CO2 sensor
  • NOX sensor
  • VOC sensor
  • Particule sensor
  • Geiger Counter

Dependencies:

  • Arduino IDE
  • ESP32 platform plugin
  • ESPDash (v3)
    • AsyncTCP
    • Arduino JSON
  • Button2 library
  • BH1750 library
  • DHT library (for DTH11, DTH21, DTH22)
  • DHT12 library (for DHT12)

ESP32 settings:

  • 160 MHz CPU and 80 MHz flash frequencies
  • 2 MB APP and 2 MB FATFS partition scheme is requiered