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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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Project] Arduino-based fan controller (4 fans) with support for automatic/manual control and speed display : r/buildapc
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Dc 12v 5a Pwm Pc Fan Temperature Manumotive Speed Controller Module Cpu High-temp Alarm With Buzz Probe For Arduino Heat Sink - Instrument Parts & Accessories - AliExpress
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