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Video of Light Organ project in action
https://www.youtube.com/watch?v=NHUzB_AjNY0
input your phone or ipod into the control board with a 1/4 stereo plug. A 1/4 inch output jack is provided to plug into your stereo system.
your analog audio is converted to illuminated bands of bright colors
.
MSGEq7 graphic equalizer IC
https://www.sparkfun.com/datasheets/Components/General/MSGEQ7.pdf
The power input is a 12V 10A power supply , the pigtails have unique plug pinouts for each light bar.
The LEDs bars stay outside 100% of the time, but the power supply and Arduino / MSGEQ7 drive board needs to come inside for the winter and bad weather.
The red pushbutton starts a test mode flashing sequence/light show.
The MSGEQ7 chips is clocked and its analog output read by an Arduno Nano. The nano outout turns on for each band that exceeds a preset analog threshold.
/*
-> added pot to analog input 1 for threshold adjust on LED trigger
-> add a PB to D6 to run a test routine that strobes the lights
control interface to MSGEQ7 IC
strobe control for equalizer bands, read in multiplexed voltage per band, drive outputs LEDs
Arduino D4 wires to MSGEQ7 pin 4 strobe
Arduino D5 wires to MSGEQ7 pin 7 reset
all ins have pull ups
Arduino D7 = 63Hz LED , LOW = ON
Arduino D8 = 160Hz LED
Arduino D9 = 400Hz LED
Arduino D10 = 1kHz LED
Arduino D11 = 2.5 kHz LED
Arduino D12 = 6kHz LED
Arduino D13 = 16kHz LED
Arduino A0 wires to MSGEQ7 pin 3 Vout
*/
int BandMagnitude[8];
int Vin =0 ;
int LEDThreshold = 500;
int strobeBit=1;
int pausetime =1000;
// the setup function runs once when you press reset or power the board
void setup()
{
Serial.begin(9600); // setup serial
// initialize digital output pins for LEDS.
pinMode(13, OUTPUT);
pinMode(12, OUTPUT);
pinMode(11, OUTPUT);
pinMode(10, OUTPUT);
pinMode(9, OUTPUT);
pinMode(8, OUTPUT);
pinMode(7, OUTPUT);
// initialize digital output pins for strobe and reset MSGEQ7
pinMode(5, OUTPUT); //reset MSGEQ7 WHEN HIGH, LOW enables STROBE
pinMode(4, OUTPUT); //strobe MSGEQ7 output, edge triggered LOW is active state for strobe
// defines and intehger array for the 7 band values, array location 0 is unused
pinMode(6, INPUT_PULLUP); //tie pin D6 to ground to run the strobe LED routine
int BandMagnitude[8];
int Vin =0 ;
}
// the loop function runs over and over again forever
void loop()
{
// initialze the strobe and reset after every scan to ensure synchronization
initializeMSGEQ7 ();
//delay (1);
delayMicroseconds(100); // minimum delay is 72 usec for strobe reset
LEDThreshold = analogRead(1) ;
for (int i=1; i <= 7; i++)
{
digitalWrite(4, LOW); // strobe is edge trigger LOW active
delayMicroseconds(30); // minimum delay is 18 usec for strobe reset
// delay (1);
Vin = analogRead(0) ;
BandMagnitude[i] = Vin ;
digitalWrite(4, HIGH); // strobe off, strobe is edge trigger LOW active
// Serial.println("BandMagnitude[i] ="); // debug value
// Serial.println(BandMagnitude[i]); // debug value
// Serial.println("[i] ="); // debug value
// Serial.println(i); // debug value
if (BandMagnitude[i]>LEDThreshold)
{ digitalWrite((6+i), LOW); }
if (BandMagnitude[i]<LEDThreshold) {digitalWrite((6+i), HIGH);}
delayMicroseconds(30); // minimum delay is 18 usec for strobe reset
// delay (90); // delay time with strobe low for the next read cycle
}
strobeBit = digitalRead(6);
if (strobeBit == LOW) { strobe();}
// Serial.println("BandMagnitude[i] ="); // debug value
Serial.println("[strobebit] ="); // debug value
Serial.println(strobeBit);
}
void initializeMSGEQ7 ()
{
digitalWrite(5, HIGH); // make RESET line HIGH
digitalWrite(4, HIGH); // turn on strobe bit
delayMicroseconds(30); // minimum delay is 18 usec for strobe width
digitalWrite(4, LOW); // turn off strobe bit
delayMicroseconds(1); // minimum delay is 100 ns
// delay(1);
digitalWrite(4, HIGH); // turn off strobe bit
// delay(1);
digitalWrite(5, LOW); // make RESET line LOW to enable the strobe line
delayMicroseconds(100); // minimum delay is 72 usec for strobe reset
// digitalWrite(5, LOW); // make RESET line LOW to enable the strobe line
// delay (1);
// digitalWrite(4, HIGH); // turn off strobe bit (low is active)
// delay(1);
}
void strobe ()
{ pausetime=500;
for (int j=1; j <= 15; j++)
{
pausetime=(pausetime/2);
if (pausetime<8){pausetime=8;}
for (int i=1; i <= 7; i++)
{ digitalWrite((6+i), LOW);
delay (pausetime);
digitalWrite((6+i), HIGH);
delay (5);
}
for (int i=0; i <= 7; i++)
{ digitalWrite((12-i), LOW);
delay (pausetime);
digitalWrite((12-i), HIGH);
delay (5);
}
}
}
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