I am sure you know those volume meters we mostly find in professional recording studios. That’s what this project is about, a simple volume meter (or decibel meter) made with Arduino, a microphone and few LEDs.
The Arduino program for this project is very optimized and shortened so you can see what a properly written program looks like.
Let’s start with a list of components we need for the project:
Basically, you can use every microphone that is compatible with Arduino just make sure that it has an analog output.
- 10 x LEDs (5 green, 3 yellow, 2 red) Color doesn’t matter so much, but it looks more awesome with different colors.
- 10 x 200-220Ω resistors
- Jumper wires
- 1 x Breadboard
Connect everything using the breadboard and make sure you are properly connecting the LEDs with resistors, it is very easy to make a mistake here.
Use male-male cables to connect everything. The microphone module can also be plugged into the breadboard.
You can use a smaller breadboard as well, no need to use a huge one as I am doing.
You will find the program to upload to the Arduino board below, as I’ve already mentioned, I have tried to reduce the whole thing in 17 lines comments excluded. That is what we called efficient programming right here! 😉
The first loop is the LEDs setup and the second is to control the LEDs. You can adjust the sensitivity by changing the value in the map function. You can change the value where you see 700: smaller for more sensitive or bigger for less sensitive.
Here we have it!
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