Arduino fan emulator

Part list

Arduino Nano ( or any other based on 328p)

• 1 * 10K resistor
• 1 * 1K resistor
• 1 * npn 2n222* transistor
• wires, connectors

Upload code to arduino via Arduino IDE

Arduino is powered from fan terminal directly from antminer

Black is GND, Red is +12V, Yellow wire (usualy 3rd is fan output that we are going to emulate).

You need to connect +12V to VIN pin ou arduino, and GND to GND pin.

2n222 base should be connected to D9 through 1K resistor 2n222 collector should be connected to +12V through 10K resistor 2n222 emitter should be connected to GND

Output signal will be generated between 10R resistor and collector.