Raspberry Pi DIY Fan

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I haven't used my remaining Raspberry Pi 2 for a while, but dug it out recently. I had to update the operating system which now has options for over-clocking the CPU to 1GHz as long as you can cool it so there is also an option to run a fan. 

The miniature 5v fan recovered from a broken laptop super glued onto a miniature heat sink recovered from a Sky+ box.

Prototyping the control circuit using a BS170 MOSFET with the gate connected to GPIO pin 14. Using pin 14 puts the 3 connections in a row (+5v/GND/GPIO14) on the RPi GPIO connector making for easy fitting.

The circuit constructed on a piece of stripboard with a recovered 3-pin connector from some long dead piece of kit.

The completed fan on top of the RPi's Broadcom CPU with a drop of thermal paste between them.

So I enabled the fan and over-clocking and ran the Pi for 2 hours running YouTube videos and a spreadsheet. A little faster but the fan never came on! Seems the heat sink and metal fan housing are enough to sink the heat without the fan.

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