Server Cooling Fan Controller

ESPHome-based server cooling fan controller using WT32-ETH01 (ESP32 with Ethernet).

Features

• Dual PWM outputs for fan control
• Temperature monitoring with DS18B20 sensors
• RPM monitoring with pulse meters for all 4 fans
• OLED display (SSD1306 128x64) with status and error pages
• Error detection with automatic error page switching
• Manual override button for full speed operation
• Runtime tracking with persistent storage and reset button
• Ethernet connectivity for reliable network connection

Hardware

• WT32-ETH01 development board
• 2N2222 NPN transistors for PWM control
• DS18B20 temperature sensors
• SSD1306 128x64 OLED display

Files

• serverCoolingFanController.yaml - Main ESPHome configuration
• docs/fan_pwm_2n2222.svg - Hardware wiring schematic
• docs/GPIO_PINOUT.txt - GPIO pin assignments