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Adafruit EMC2101 I2C PC Fan Controller and Temperature Sensor - STEMMA QT / Qwiic
The Adafruit EMC2101 I2C PC Fan Controller and Temperature Sensor - STEMMA QT / Qwiic by Adafruit is a value-for-money temperature and humidity sensor designed for everyday users. It features Item Type: Breakout Board and Model No. / Name: Temperature Sensor, PC Fan Controller.
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About This Product
The Adafruit EMC2101 I2C PC Fan Controller and Temperature Sensor - STEMMA QT / Qwiic by Adafruit is a value-for-money temperature and humidity sensor designed for everyday users. It delivers reliable performance at an accessible price.
Key Specifications
- Item Type: Breakout Board
- Model No. / Name: Temperature Sensor, PC Fan Controller
- Operating Voltage (V): 3.3 — works with standard household power
- Shipping Weight: 0.011 kg
- Shipping Dimensions: 4 × 3 × 2 cm
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The Adafruit EMC2101 I2C PC Fan Controller and Temperature Sensor brings intelligent fan control to your projects with ease, thanks to its seamless STEMMA QT / Qwiic connector system for plug-and-play I2C integration. Built around the Microchip EMC2101 chip, this breakout board allows you to control 3- or 4-pin PC fans using a programmable PWM signal while also monitoring fan speed through its tachometer input. It features both an internal temperature sensor with ±1°C accuracy and support for an external sensing diode, giving you flexible thermal feedback options.
You can even set up a temperature-to-fan-speed curve using a built-in LUT, allowing the board to automatically adjust fan speed based on ambient or remote temperatures. Whether you're cooling a Raspberry Pi enclosure, building a quiet electronics project, or retrofitting an existing device, this board helps you manage airflow efficiently and quietly—no extra code or components needed.
Features:
- The EMC2101 is a smart fan controller for 3- and 4-pin PC fans.
- It provides a programmable PWM output to control fan speed.
- It includes a tachometer input to monitor fan speed feedback.
- Built-in internal temperature sensor with ±1°C accuracy.
- Supports external temperature sensing via a diode input.
- Allows configuration of a temperature-to-fan-speed LUT (Lookup Table).
- Automatically adjusts fan speed based on temperature readings.
- Communicates over standard I2C, easy to interface with microcontrollers.
- Helps reduce fan noise by lowering speed during light thermal loads.
- Useful for DIY electronics, PC mods, repairs, or quieting noisy fans.
- Small, efficient, and easy to integrate into compact systems.
- Eliminates the need for custom PWM generation or tach monitoring in firmware.
Package Includes:
1 x Adafruit EMC2101 I2C PC Fan Controller and Temperature Sensor
