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Controlling a 4-wired fan PWM Signal using Arduino allows only two settings - Electrical Engineering Stack Exchange
![Adafruit EMC2101 I2C PC Fan Controller and Temperature Sensor [STEMMA QT / Qwiic] : ID 4808 : $5.50 : Adafruit Industries, Unique & fun DIY electronics and kits Adafruit EMC2101 I2C PC Fan Controller and Temperature Sensor [STEMMA QT / Qwiic] : ID 4808 : $5.50 : Adafruit Industries, Unique & fun DIY electronics and kits](https://cdn-shop.adafruit.com/product-videos/1024x768/4808-05.jpg)
Adafruit EMC2101 I2C PC Fan Controller and Temperature Sensor [STEMMA QT / Qwiic] : ID 4808 : $5.50 : Adafruit Industries, Unique & fun DIY electronics and kits
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