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Amazon.com: GeeekPi 2PCS Raspberry Pi 4 PWM Controllable Fan, Raspberry Pi PWM Speed Adjustment Fan 40x40x10mm, Raspberry Pi Speed Control Fan DC 5V 4010 Quiet Fan for Raspberry Pi 4, 3 B+,
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Amazon.com: GeeekPi Fan Hat for Raspberry Pi 4 Model B, Raspberry Pi PWM Fan GPIO Expansion Board with 0.91inch OLED Display for Raspberry Pi 4B/3B+/3B/2B : Electronics
![Raspberry Pi CPU Fan Automation - #37 by Mariusthvdb - Share your Projects! - Home Assistant Community Raspberry Pi CPU Fan Automation - #37 by Mariusthvdb - Share your Projects! - Home Assistant Community](https://community-assets.home-assistant.io/original/3X/8/4/84c2e73f6b548306ed80184ec9a33703b98a25ee.jpeg)
Raspberry Pi CPU Fan Automation - #37 by Mariusthvdb - Share your Projects! - Home Assistant Community
![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)