via MAKE Magazine by Matt Mets on 7/29/10
Spotted in the MAKE Flickr pool:
Flick user Arms22 built this 7 Segment LED FAN Revolution Display to monitor the speed of a PC case fan. It's a pretty simple project, but a good introduction to sensing pulse durations and driving multiple seven segment displays. The write-up is in Japanese, or you can find a machine translated version here.
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