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Raspberry Pi 4 Pwm Controlled Fan Hat Speed Via I2c Bus Pca9685 Driver Temperature Monitor - Demo Board - AliExpress
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Raspberry Pi 4 Cooling Fan Intelligent Speed Control Expansion Board RGB Cooling HAT with OLED Display for Raspberry Pi 3B+/3B _ - AliExpress Mobile
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![GitHub - hamzab70/Raspberry-Pi-Fan-Script: Simple Bash script to control the fan speed using the Rapsberry Pi GPIO and a transistor. GitHub - hamzab70/Raspberry-Pi-Fan-Script: Simple Bash script to control the fan speed using the Rapsberry Pi GPIO and a transistor.](https://raw.githubusercontent.com/hamzab70/Raspberry-Pi-Fan-Script/master/Electrical-Scheme.png)