If you are in a plan to build your own speedometer for your next robotic vehicle, ofcourse you need an RPM sensor to complete the task. Today, almost all sensor modules for use with microcontrollers ...

So I just bought this nice new switch off Ebay for cheap and it has 4 very loud fans in it. I'd like to replace them with lower noise (and lower flow, I'll take my chances) fans so I can hear myself ...

I just had an Idea. Sure was neat.<P>Make a small (bay/Fan)bus like thing, right? And have another connect on there for RPM sensors, lead that wire to an LCD screen mounted in the front, and using ...