55 lines
2.7 KiB
Markdown
55 lines
2.7 KiB
Markdown
# MicroEnv v1.x
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The MicroEnv is a compact and simplistic environmental monitoring sensor,
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based on the ESP32-C3 and the Sensirion SGP41 and SHT45 sensors, using
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ESPHome for integration with HomeAssistant
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Use a MicroEnv near a source of emissions to monitor air quality, or as
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a general room environmental tracking sensor. It is, in effect, a cut
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down version of the environmental sensor package of my [Supersensor 2.x](https://github.com/joshuaboniface/supersensor2)
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project in a much smaller footprint.
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Power is provided by USB-C, though a very slim connector is required when
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using SMD soldering without a buffer.
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The Sensirion sensors are elevated with through-hole pins, to ensure
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optimal distance between the (warm) board and the sensors themselves.
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You can either directly solder the sensors to the board or, as I do,
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use 4-pin female sockets for easy changing should it be necessary.
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## Parts List
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| Qty | Component | Cost (mid-2025 CAD, ex. shipping) | Links |
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|-------|---------------------|-----------------------------------|-------|
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| 1 | GY-SGP41 | $9.58 | [AliExpress](https://www.aliexpress.com/item/1005007958589642.html) |
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| 1 | GY-SHT45 | $5.67 | [AliExpress](https://www.aliexpress.com/item/1005008175340220.html)* |
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| 1 | ESP32-C3 | $3.12 | [AliExpress](https://www.aliexpress.com/item/1005007205044247.html) |
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| 2 | Female 4-pin header | $0.37 ($14.99/40) | [Amazon](https://www.amazon.ca/dp/B08LF3S5S8) |
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| 1 | Custom PCB (JLC) | $0.50 ($5.00/10) | [GitHub](https://github.com/joshuaboniface/microenv) |
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| **TOTAL** | | **$19.24** | |
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`*` Ensure you select the correct device on the page as it shows multiple options.
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## Configurable Options
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There are several UI-configurable options with the MicroEnv to help you get
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the most out of the sensor for your particular use-case.
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### Temperature Offset (selector, -30 to +10 @ 0.1, -5 default)
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Allows calibration of the SHT45 temperature sensor with an offset from -30 to +10
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degrees C. Useful if the sensor is misreporting actual ambient tempreatures. Due
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to internal heating of the SHT45 by the ESP32, this defaults to -5; further
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calibration may be needed for your sensors and environment.
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### Humidity Offset (selector, -20 to +20 @ 0.1)
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Allows calibration of the SHT45 humidity sensor with an offset from -20 to +20
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percent relative humidity. Useful if the sensor is misreporting actual humidity.
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## Home Assistant View
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This image shows the various available sensors in Home Assistant.
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