{"title":"Adafruit EMC2101 I2C PC Fan Controller and Temperature Sensor - STEMMA QT / Qwiic","handle":"adafruit-emc2101-i2c-pc-fan-controller-and-temperature-sensor-stemma-qt-qwiic","url":"/products/adafruit-emc2101-i2c-pc-fan-controller-and-temperature-sensor-stemma-qt-qwiic","description":"The Adafruit EMC2101 breakout is an I2C fan controller and temperature sensor that makes it easy to integrate 3-pin or 4-pin PC fans into your projects. The Microchip/SMSC EMC2101 handles PWM speed control and tachometer monitoring over I2C, so you don't need to dedicate PWM outputs or counter inputs on your microcontroller.\n\nIn addition to fan control, the EMC2101 includes an internal temperature sensor and support for an external temperature-sensing diode. With the external sensor connected, you can configure a look-up table (LUT) that automatically adjusts fan speed based on temperature — fully autonomous thermal management without any code running on your microcontroller.\n\nKey Features\n\n\nPWM Fan Control – Programmable PWM output for 3-pin and 4-pin PC fans\n\nTachometer Input – Monitor fan RPM to verify the fan is running as expected\n\nInternal Temperature Sensor – Built-in temperature monitoring with ±1°C accuracy\n\nExternal Temperature Input – Connect an external sensing diode for remote temperature measurement\n\nAutomatic Fan Speed LUT – Configure temperature-to-speed mappings for autonomous thermal management\n\nI2C Interface – Simple two-wire communication for control and monitoring\n\nSTEMMA QT / Qwiic – Dual I2C connectors for solderless daisy-chaining\n\n3.3V and 5V Compatible – On-board voltage regulator and 5V-tolerant pins\n\n\nIdeal For\n\nAdding cooling fans to electronics enclosures\nAutomated thermal management for 3D printers, servers, or custom builds\nQuieting noisy equipment by reducing fan speed when cooling demand is low\nEnvironmental monitoring with temperature-triggered ventilation\n\n\nPackage Contents\n\n1× Adafruit EMC2101 I2C PC Fan Controller and Temperature Sensor – STEMMA QT\n\n\n\nNote: PC fan and external temperature diode are not included. Works with standard 3-pin and 4-pin PC fans.\n","vendor":"Adafruit","product_type":"physical","in_stock":true,"options":[],"variants":[{"id":3591,"title":"Default Title","sku":"AF-4808","price":11.82,"compare_at_price":0.0,"on_sale":false,"in_stock":true,"available_quantity":15,"option1":"Default Title"}]}