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It is well known that the Raspberry Pi 4 gets quite hot and reduces its processing speed if it has to work hard. In one of my Quickies, I tested the passive FLIRC case. In the comments, viewers pointed me to two Chinese cooling solutions and Cristopher Bartlett from Explaining computers tested a few others.
Time for a new Quickie with a summary of all these coolers. And some ideas for optimizations.
I am a proud Patreon of GreatScott!, Electroboom, Electronoobs, and others.

Links:
Chinese Coolers: http://s.click.aliexpress.com/e/dTspeDEg or http://bit.ly/2V8ExY2 and http://bit.ly/2V4DYyd
60mm Fan: http://s.click.aliexpress.com/e/tiy0uCjW

Videos:
Explaining Computers: https://youtu.be/e6mWImsF9iI
Temperature controlled Fan 1: https://youtu.be/P5o0PpfzuW8
Temperature Controlled Fan 2: https://youtu.be/6Z-1A6oDFXI
Tips & Tricks: https://youtu.be/uYf7vFREV98
Crimpers: https://youtu.be/25qObkSUHng
#Raspberry Pi #Electronics

Supporting Material and Blog Page: http://www.sensorsiot.org
Github: https://www.githu…

Topics of this video:
We build a cooled Raspi without too much noise which automatically shuts down if battery is low.

A small fan is sufficient to keep the Raspi 3 cool
A simple hardware switches a fan on and off
A Python program reads the CPU temperature and switches the fan according the temperature
We are able to auto-launch applications during boot (including error logging)
We build a nice “battery fuel gauge” and
hack the gauge to provide a "battery low" signal
We learned how to use logic level N-channel FETs
A normal NPN transistor shuts our Raspi automatically down

Links:
All Material and commands: http://www.sensorsiot.org/pimp-my-raspberry-pi-3/
Assortment Transistors http://bit.ly/2puOuxN
Battery "Fuel Gauge" http://bit.ly/2nHJDbr
Raspberry 3 Kit http://bit.ly/2o6Acp3
Case/Fan/Battery Kit http://bit.ly/2p75nlz

Supporting Material and Blog Page: https://www.Sensorsiot.org
Github: https://www.github.com/sensorsiot
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