Hello, Element 14!

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.


Arduino code: https://drive.google.com/open?id=1rQOOFIvJx4MsbnUM9IK0Y2h0UhT8-iry


This is what the LED strip looks like when on:

Links to previous blog posts:

DIY Control Any AC Appliance Using A Timer

Introduction To The Multimeter


Thanks for reading!