The Shower Test - can you spot PWM?

[jeff51]

So as not to hijack this thread,
I did a post about using Audio software to measure PWM Frequency:

Measure PWM Frequency Using Audio Software

Or “How to Kill Your Sound Card in 3 Easy Steps” This is a branch off these threads: Terry Oregon (Long) Various sensors for measuring PWM My post about building a sensor based on Terry’s design ToyKeeper’s post about seeing PWM in the shower (err… make that seeing PWM in shower spray photo) A quick PWM overview (thought we might need this) PWM (Pulse Wave Modulation) is a commonly used method of controlling the brightness of an LED. Basically the LED is turned on and off at a specifi…