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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 \u2192 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:\n\n                        \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510 5V   \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510  \n  12V+     \u250c\u2500\u2500\u2500\u2500\u2500\u2510      \u2502        \u251c\u2500\u2500\u2500\u2500vcc        \u2502  \n  \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2534\u2500\u2500\u2500\u2500\u2500\u2534\u2500\u2500\u2500\u2500\u252c\u2500\u2524 5V Reg \u2502      \u2502        \u2502  \n            Switch    \u2502 \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518      \u2502 esp32  \u2502  \n                      \u2502                 \u2502        \u2502  \n                      \u251c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510      \u2502 D1     \u2502  \n                      \u2502 Fan      \u2502      \u2502 Mini   \u2502  \n                      \u2502 Headers  \u2502      \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518  \n                                                    \n                    12v pin    12v pin

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