ESPHome Automatic 4-Wire PWM (5-24v) Fan controller with Alarm.

Using a DALLAS temperature sensor and a threshold Slider, the speed of the Fan is automatically controlled from 0 to 100%. Making it ideal for ventilating / cooling your projects. I.E. Holiday Lights controller enclosure, Media Cabinet units and many more.

• With an on-board regulator to power the D1 Mini, this project is ready to control 5,12 or 24 Volt fans without modification
• (just make sure you power this project with the same voltage your fan uses).

ESPHome 2024.6.0/1 Update notice:

If you are having problems with board resetting or DALLAS temperature after adding the one_wire: Breaking Change. ssieb has got a fix for you. Please add this External Component to your YAML:

external_components:
  - source:
      type: git
      url: https://github.com/ssieb/esphome
      ref: onewire
    components: [ gpio ]
    refresh: 1min

• I have also added it to the Yaml Files.

• Note: This has now been "fixed" in ESPHome 2024.6.2 and therefore no longer required.

Watch the tutorials here:

Part 1 - Building the Circuit Board

Part 2 - ESPHome Flash and Breakdown

Part 3 - Custom Dashboard Button

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Problem: Temperature sensor cycles between On/NAN

Solution: Add a 4.7K Resistor

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Problem 2: Some Fans not turning off. Andrew has a solution: See Issue #2 Here