Home Assistant-compatible ESP32 4-channel PWM fan controller is designed for server racks and NAS systems

Designed by CoolMaker Lab in China, the ESP32 4-channel PWM fan controller is an open-source, Home Assistant-compatible board for managing cooling in server racks, NAS systems, network cabinets, and other DIY enclosures. It can independently control up to four 4-pin PWM fans, supporting PWM-based speed adjustment, tachometer-based RPM monitoring, and individual fan power switching. The controller supports up to four external DS18B20 temperature sensors for automatic fan speed adjustment, along with a web interface, an HTTP REST API, and Bluetooth…

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