Intro: Sound Activated Lightbar
This is a quick video how the lightbar works.
I got the idea her from Instructables and similar sites.
And I can use some off the things I got laying around in my compartments.
Step 1: The Parts
I used some RGB-led’s and some plastic " diamonds ", where i drilled a 5 mm hole and glued the led's.
A sound sensor module, all will work, I tried with a small microphone but that didn’t worked for me.
The power supply is a USB Lithium Battery Charger Module and I mounted a cable so is always connected.
And at the last I used a Attiny85 on a ATtiny85 ISP! Arduino Compatible Breakout Board from
This is maybe a little bit overkill but this I got.
Step 2: Now It Is Time to Solder It Together.
The led's are common anode, I soldered them together and also the three colours.
I use one 200 ohm resistor for common anode, maybe not right. But it work.
The charger module and the Attiny85 ISP are soldered to a piece of strip-board,
her I also soldered the connection for the led's and the sound module to the pins.
Step 3: The Progamm of the Lightbar
I found a skeleton from the internet and changed it so it work with the components.
It is properly not the best programming work, I learning, but it gives the led's live.
I used the smoothing part from arduino.cc and made for each colours a value.
This make the colour change by different sound frequency, kind of.
You can tweak the sensitivity " #define sensitivity 250 "
And you can change the value some be multiple with the sensitivity
if((abs(value - average)) > 3*sensitivity)