How do I manage voltage regulation for variable input

Thread Starter


Joined Mar 20, 2017
Hey all!

I'm trying to build an LED frequency counter. My input signal is an LED I'm using as a detector recieving from an output LED on my signal generator. I'm using square wave output to emulate pwm and my circuitry is going to process the signal to output a 5v logic output that can be read my my microprocessor.

An inherent problem with this is the voltage variance from the LED as I move the source close and further from the detector.

Is there any way I can regulate this voltage while still being able to read the duty cycle? Like a gain stage limiter or something?

Please help,