A semiconductor for detecting metal.

[spanduro]

I Know that this have be done lots of times, so I was hoping that will be easy for you guys.

I need a semiconductor for detecting metal without a magnet, it is for detecting the speed of the back wheel of my kids speedway bike. I will use a small microprocessor (STM32) for the data handling afterwards.

Any ideas.

Best regards.

 

[FvM]

I don't believe that you'll find "a semiconductor" for this purpose. Inductive proximity sensors (based on eddy currents) are the usual method.

 

[smijesh]

Photo electric sensors can be used by using Infrared transmitter and receiver.