Simple LED VU meter from system audio

A music reactive LED array that uses Python and serial communication inputs

Jan 1, 2023

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Audio

Lights

Components and supplies

Arduino Uno Rev3

LED (generic)

74HC595 Shift Register

220 Ohm Resistor

Jumper wires (generic)

Apps and platforms

Arduino IDE

Python 3

Project description

Code

Arduino lights

Lights up LED based on RMS

1int latchPin = 11;
2int clockPin = 9;
3int dataPin = 12;
4byte LEDs =  128 ;
5int rms;
6
7void lightUp() {
8  digitalWrite(latchPin, LOW);
9  shiftOut(dataPin, clockPin, LSBFIRST, LEDs);
10  digitalWrite(latchPin, HIGH);
11}
12
13void setup() {
14  // put your setup code here, to run once:
15  Serial.begin(115200);
16  pinMode(latchPin, OUTPUT);
17  pinMode(dataPin, OUTPUT);
18  pinMode(clockPin, OUTPUT);
19}
20
21
22void loop() {
23
24rms=(Serial.readStringUntil('/r')).toInt();
25
26if(rms<50){ 
27  LEDs = 0;
28}
29else if(rms >50 && rms<100){ 
30  LEDs = 128;
31}
32else if(rms >100 && rms<150){ 
33  LEDs = 192;
34}
35else if(rms >150 && rms<200){ 
36  LEDs = 224;
37}
38else if(rms >200 && rms<250){ 
39  LEDs = 240;
40}
41else if(rms >250 && rms<300){ 
42  LEDs = 248;
43}
44else if(rms >300 && rms<350){ 
45  LEDs = 252;
46}
47else if(rms >350 && rms<400){ 
48  LEDs = 254;
49}
50else if(rms >400){ 
51  LEDs = 255;
52}
53
54else{
55  
56}
57
58lightUp();
59}

int latchPin = 11;
int clockPin = 9;
int dataPin = 12;
byte LEDs =  128 ;
int rms;

void lightUp() {
  digitalWrite(latchPin, LOW);
  shiftOut(dataPin, clockPin, LSBFIRST, LEDs);
  digitalWrite(latchPin, HIGH);
}

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(latchPin, OUTPUT);
  pinMode(dataPin, OUTPUT);
  pinMode(clockPin, OUTPUT);
}


void loop() {

rms=(Serial.readStringUntil('/r')).toInt();

if(rms<50){ 
  LEDs = 0;
}
else if(rms >50 && rms<100){ 
  LEDs = 128;
}
else if(rms >100 && rms<150){ 
  LEDs = 192;
}
else if(rms >150 && rms<200){ 
  LEDs = 224;
}
else if(rms >200 && rms<250){ 
  LEDs = 240;
}
else if(rms >250 && rms<300){ 
  LEDs = 248;
}
else if(rms >300 && rms<350){ 
  LEDs = 252;
}
else if(rms >350 && rms<400){ 
  LEDs = 254;
}
else if(rms >400){ 
  LEDs = 255;
}

else{
  
}

lightUp();
}

Audio Analysis

python

Calculates, encodes and sends rms value to Arduino

1import pyaudio
2import audioop
3import serial
4
5
6arduinoData = serial.Serial('com3',115200)
7
8CHUNK = 1024 
9FORMAT = pyaudio.paInt16
10CHANNELS = 2
11RATE = 44100 
12
13p = pyaudio.PyAudio()
14stream = p.open(format = FORMAT,
15                channels = CHANNELS,
16                rate = RATE,
17                input = True,
18                input_device_index = 2,
19                frames_per_buffer = CHUNK)
20
21
22while True:
23    data = stream.read(CHUNK)
24    rms = audioop.rms(data, 2) 
25    rmsVal = str(rms) + '/r'
26    arduinoData.write(rmsVal.encode())
27    print(rms)

import pyaudio
import audioop
import serial


arduinoData = serial.Serial('com3',115200)

CHUNK = 1024 
FORMAT = pyaudio.paInt16
CHANNELS = 2
RATE = 44100 

p = pyaudio.PyAudio()
stream = p.open(format = FORMAT,
                channels = CHANNELS,
                rate = RATE,
                input = True,
                input_device_index = 2,
                frames_per_buffer = CHUNK)


while True:
    data = stream.read(CHUNK)
    rms = audioop.rms(data, 2) 
    rmsVal = str(rms) + '/r'
    arduinoData.write(rmsVal.encode())
    print(rms)

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