DIY Analog VU meter with Arduino peak meter

The simplest and cheapest way to make a stand-alone analog quality VU meter with instruments from an old unusableaudio audio device.

Jul 5, 2024

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Audio

Monitoring

Toys

Components and supplies

LED (generic)

Operational Amplifier, Op Amp + Comparator + Reference

10kOhm potentiometer

Arduino Nano

Ammeter, AC

Tools and machines

Soldering kit

Apps and platforms

Arduino IDE

Project description

Code

Code VU

cpp

...

1#define L A0
2#define R A1
3 
4int sigL = 0;
5int sigR = 0; 
6
7void setup() {
8 pinMode(2, OUTPUT);
9 pinMode(3, OUTPUT);
10}
11 
12void led() {
13 sigL = analogRead(L)*5;
14 sigR = analogRead(R)*5;
15 if (sigL > 600)  {digitalWrite(2, HIGH);} else {digitalWrite(2, LOW);}
16 if (sigR > 650) {digitalWrite(3, HIGH);} else {digitalWrite(3, LOW);}
17 
18}
19 
20void loop() {
21 led();
22}

#define L A0
#define R A1
 
int sigL = 0;
int sigR = 0; 

void setup() {
 pinMode(2, OUTPUT);
 pinMode(3, OUTPUT);
}
 
void led() {
 sigL = analogRead(L)*5;
 sigR = analogRead(R)*5;
 if (sigL > 600)  {digitalWrite(2, HIGH);} else {digitalWrite(2, LOW);}
 if (sigR > 650) {digitalWrite(3, HIGH);} else {digitalWrite(3, LOW);}
 
}
 
void loop() {
 led();
}

Downloadable files

Schematic

Op amp

Schematic.jpg

Schematic Peak meter

arduino

Schematic Arduino.jpg

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mircemk

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