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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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PWM Regulated Fan Based on CPU Temperature for Raspberry Pi : 4 Steps (with Pictures) - Instructables
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PWM Regulated Fan Based on CPU Temperature for Raspberry Pi : 4 Steps (with Pictures) - Instructables
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