This project will show how to display NIXIE tube by Arduino and Optocoupler chip only
Measure rotation speed (RPM) with Optocoupler and Encoder disk and Arduino - Quick and Easy!
Connect and use Photo Interrupter (Slotted Optocoupler) in your Arduino projects - quick and easy.
Transduce the 12 VAC to a digital switch attached to your favorite HW platform.
A quick, simple circuit only using a few basic components to flash an LED with the frequency having the capability to be changed.