Anybody know of an I2C RPM Sensor?

Hi,

   I'm new to the hobby (of drones, not R/C Aircraft).  I love computers and programming, so I thought I'd take on an educational project of making an autopilot out of a $35 Raspberry Pi computer. So far I have a functioning Mini Maestro servo con

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Thoughts on Hall Effect Sensor RPM sensing code

I have a hall effect sensor for sensing gas/glow engine RPM.  No electric motor for easy computing of RPM unfortunately.  The trouble I'm facing is polling of RPM.  Granted, I haven't started the project yet, just thought about it, but I'd like to av

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