ESPHome Dual channel fan controller
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Designed for cupboard AV/server cupboard ventilation; control intake and exhaust separately via ESPHome/HA
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- Creative Commons — Attribution — Noncommercial
Basic dual header fan controller to enable independent settings on intake and exhaust via ESPHome/Home Assistant.
NOTE: The lid is designed to be printed without top and bottom layers such that the infill pattern will create a ventilation grille.
Components:
- Wemos/Lolin ESP32 d1 mini + pins/socketed connectors
- 70x30mm protoboard
- LM2596 Adjustable Voltage Regulator - or any simple DCDC buck converter for 12V → 5V step down. (Powering ESP32)
- 2x 4pin right angle dupont connector or right angle fan headers - topside keying.
- 5.5mm barrel jack for 12v input
- Latching button with 12mm shank (optional)
- hookup wire
- 4x m6 brass inserts
- 4x m6x20mm DIN 912 - Hexagon socket Head Cap Screws
- 2x <12G countersunk screw for mounting (gauge less than 6mm)
NOTE: Some ESP32 variations don't like being powered via VCC and may require a 10uF cap between RST and GND like mine did.
See photos for wiring of 4pin pwm headers
POWER HOOKUP: ┌────────┐ 5V ┌────────┐
12V+ ┌─────┐ │ ├────vcc │
─────────┴─────┴────┬─┤ 5V Reg │ │ │
Switch │ └────────┘ │ esp32 │
│ │ │
├──────────┐ │ D1 │
│ Fan │ │ Mini │
│ Headers │ └────────┘
12v pin 12v pin </code></pre>