In this blog post I wanted to show you this VU Meter I made using an Attiny 85, and a WS2812b LED strip.
Here is the schematic of the circuit:
This circuit basically just taps into an audio signal from a 3.5 mm jack, which gets converted to a mono signal, and then goes to an amplifier with a gain of 10 which then, goes to an analog input of the Attiny.
The potentiometer is for adjusting the input level.
Originally I was going to use an Arduino Uno but, I was only using one analog pin, and one digital pin. So, I decided to use something smaller, and Attiny 85.
I've never used one before, so I learned some new stuff while making this, which is always great!
The signal goes from the Attiny 85 to a 3 pin terminal block where the LED strip connects.
The circuit is powered by positive 5 volts for the Attiny, and led strip, and also uses negative 5 volts for the op-amp.
The whole circuit draws just under 2 amps at full brightness.