# 3-wires fan and speed measurements

**URL:** <https://community.advfirmwares.com/t/3-wires-fan-and-speed-measurements/1420>\
**Category:** General\
**Created:** [April 11, 2020, 1:40pm UTC](https://community.advfirmwares.com/t/3-wires-fan-and-speed-measurements/1420 "2020-04-11T13:40:56Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![andrivet](https://community.advfirmwares.com/user_avatar/community.advfirmwares.com/andrivet/32/993_2.png) [@andrivet](https://community.advfirmwares.com/u/andrivet)\
**Post date:** [April 11, 2020, 1:40pm UTC](https://community.advfirmwares.com/t/3-wires-fan-and-speed-measurements/1420/1 "2020-04-11T13:40:56Z")

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I publish a video about 3-wires fans, how they work, how to measure their speed and some notions like open collector and pull-up resistors.

It is more generic that purely for 3D printers, but it may interest you:

https://www.youtube.com/embed/kkDaP_ZDM74?feature=oembed&wmode=opaque