WiFi Fan Controller
Smart fan control for your Home Assistant setup
A CE-certified, ESP32-based PWM fan controller designed for home server racks, media cabinets, and smart home projects. Control up to 4 fans with temperature-based automation, remote monitoring, and seamless Home Assistant integration.
Why This Fan Controller?
Intelligent Climate Control: Automatically adjust fan speeds based on temperature and humidity readings from the integrated HDC1080 sensor. Turn fans off when equipment is idle, ramp up when things heat up.
Home Assistant Native: Built on ESPHome for seamless integration with Home Assistant. Monitor temperatures, adjust fan speeds, and create automations directly from your smart home dashboard.
Hackable & Expandable: Fully customizable ESPHome configuration with Qwiic and I2C expansion ports, NeoPixel output, user buttons, and GPIO breakouts. Add sensors, displays, or integrate with your existing projects.
Professional Quality: CE certified hardware with RGB status LEDs showing system status at a glance. Standard 12V barrel jack power input works with commonly available power supplies.
Key Features
- 4× PWM Fan Outputs with RPM monitoring
- Built-in HDC1080 temperature & humidity sensor
- RGB Status LEDs for board and fan port status (Rev 3.x)
- Qwiic & I2C Expansion for additional sensors
- USB-C Flashing - no programming adapter needed (Rev 2.0+)
- WiFi OTA Updates via ESPHome
- 3 User Buttons for custom functions
- Low Power - only 0.25W typical operation
Get Started in Minutes
Flash pre-built firmware directly from your browser. Connect your board via USB-C and click the button for your hardware revision below.
Hardware Revisions
Rev 3.1, 3.2, 3.3 - Latest Generation (Recommended)
RGB status LEDs, enhanced signal integrity, improved USB resilience, and full expansion capabilities. Revisions 3.2 and 3.3 include minor component upgrades.
| Detailed specs: Rev 3.1 | Rev 3.2 | Rev 3.3 |
Rev 3.0 - Expansion Focus
Added Qwiic I2C port, 5V NeoPixel output, and GPIO expansion header for maximum hackability.
Rev 2.0 - USB-C
Upgraded to ESP32-S2 with USB-C flashing support, eliminating the need for serial programming adapters.
Rev 1.0 - Original
First generation design with ESP32. Requires programming header or SOCbite connector for flashing.
Get Your Board
Ready to upgrade your setup? Boards and 3D-printed cases available at Elecrow for $35.
Open Source: Full documentation, hardware configurations, and ESPHome packages available on GitHub. Create custom automations and share your configurations with the community.
Need Help? Check the documentation or open an issue on GitHub.