aliask / humidity-switch

Humidity Switch

Design for a humidity-controlled switch, originally intended to be used to run a dehumidifier on a sailboat.

The design is:

• Low power, designed to be battery operated
• Simple, using off-the shelf parts where possible
• Cheap

System Diagram

graph LR
    subgraph Tasmota ESP12F_Relay_X2
        ESP[Microcontroller<br>ESP8266] -->|Signal| Relay
    end

    BB[Boat Battery<br>12 V<sub>DC</sub>] --> Buck[DC Regulator<br>Buck SMPS]
    ESP <--->|I<sup>2</sup>C| DHT[Humidity Sensor<br>DHT22]
    BB -.-|Analog sample| ESP

    Relay -->|9 V<sub>DC</sub>| Dehumidifier
    Buck --->|9 V<sub>DC</sub>| Relay

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References

• MicroPython Reference
• ESP8266 GPIO
• Tasmota ESP12F Relay X2 - Official Page
• Tasmota ESP12F Relay X2 - PDF