I made a simple arduino&processing project, that sends values from processing to arduino, to PWM some leds.
The problem I have is that the leds keep blinking randomly when they shouldn’t.
It seems to be in the communications side of things.
Arduino’s side looks like this
´/* Led Pixel script - www.anthonymattox.com
* recieves input from processing script */
int redPin=9;
int greenPin=10;
int bluePin=11;
int redVal=0;
int greenVal=0;
int blueVal=0;
byte buff[]= "00000000";
void setup() {
Serial.begin(9600);
pinMode(redPin,OUTPUT);
pinMode(greenPin,OUTPUT);
pinMode(bluePin,OUTPUT);
}
void loop() {
while (Serial.available()>=2) {
for (int i=0; i<10; i++) {
buff[i]=buff[i+1];
}
buff[10]=Serial.read();
if (buff[10]=='R') {
redVal=int(buff[9]);
}
if (buff[10]=='G') {
greenVal=int(buff[9]);
}
if (buff[10]=='B') {
blueVal=int(buff[9]);
}
analogWrite(redPin,redVal);
analogWrite(greenPin,greenVal);
analogWrite(bluePin,blueVal);
}
}
And Processing has:
import krister.Ess.*; // import audio library
import processing.serial.*; // serial communication library
FFT myfft; // create new FFT object (audio spectrum)
AudioInput myinput; // create input object
int audioScale; // variable to control scaing
float redvalue =0;
float greenvalue = 0;
float bluevalue = 0;
int redavag = 0;
int redavagcount = 0;
int redavagraw = 0;
int redInt = 0;
float redIntensity = 0.6;
int greenavag = 0;
int greenavagcount = 0;
int greenavagraw = 0;
int greenInt = 0;
float greenIntensity = 1;
int blueavag = 0;
int blueavagcount = 0;
int blueavagraw = 0;
int blueInt = 0;
float blueIntensity = 1.5;
int redoverload = 0;
int greenoverload = 0;
int blueoverload = 0;
float highfreq = 0;
int bufferSize=1024;
int sampleRate = bufferSize;
int sampleZoom = 3;
int sampleAverage = 256;
int sampleAverageSize = (bufferSize / sampleAverage) * sampleZoom ;
int sampleStart = 0;
int sampleFreqText = sampleAverageSize;
int sampleOffset = 30;
int speccell = 0;
slider s1; // create two slider objects
slider s2;
Serial port;
void setup() {
size(140,315);
frameRate(30);
background(255);
noStroke();
fill(0);
noSmooth();
textAlign(RIGHT);
Ess.start(this); // start audio
myinput=new AudioInput(bufferSize); // define input
myfft=new FFT(bufferSize*2); // define fft
myinput.start();
myfft.equalizer(false);
//myfft.limits(.005,.01);
myfft.limits(.02,.1);
//myfft.noLimits();
myfft.averages(sampleAverage); // controls number of averages
myfft.envelope(0);
myfft.smooth=false;
println("Available serial ports:"); // define 'port' as first
println(Serial.list()); // ...available serial port
port = new Serial(this, Serial.list()[0], 9600);
s1=new slider(25,25,255, color(200,150,80)); // define slider objects
s2=new slider(75,25,255, color(200,150,80));
s1.p=100; // default position of sliders
s2.p=190;
}
void draw() {
audioScale=s1.p*10; // adjust audio scale according to slider
myfft.damp(map(s2.p,0,255,1,.0)); // adjust dapming
redvalue = ( ( ( (myfft.averages[0] + myfft.averages[1])*audioScale) / 2 ) * redIntensity);
greenvalue = ( ( ( (myfft.averages[2] +myfft.averages[3] + myfft.averages[4])*audioScale) / 3 ) * greenIntensity );
bluevalue = (((( myfft.averages[7] + myfft.averages[8] + myfft.averages[9] + myfft.averages[10] + myfft.averages[11] + myfft.averages[12])*audioScale) / 6 ) * blueIntensity );
redInt = int(redvalue);
greenInt = int(greenvalue);
blueInt = int(bluevalue);
if (redInt > 255) { redInt = 255; redoverload++;}
else if (redInt < 2) redInt = 0;
if (greenInt > 255) { greenInt = 255; greenoverload++;}
else if (greenInt < 2) greenInt = 0;
if (blueInt > 255) { blueInt = 255; blueoverload++;}
else if (blueInt < 2) blueInt = 0;
drawGUI();
// draw led intensity bars
fill(255,0,0);
rect(100,300,10,-redInt);
fill(0,255,0);
rect(110,300,10,-greenInt);
fill(0,0,255);
rect(120,300,10,-blueInt);
fill(0,0,0) ;
text(s1.p, 35, 300);
text(s2.p, 85, 300);
sendSerial();
}
// FUNCTION CALLS
// sets up audio input
public void audioInputData(AudioInput theInput) {
myfft.getSpectrum(myinput);
}
void drawGUI() {
background(255);
fill(0,0,0);
//Render Sliders
pushStyle();
s1.render(); // render sliders
s2.render();
popStyle();
}
//SEND THE SERIAL DATA
void sendSerial() {
port.write(redInt);
port.write('R');
port.write(greenInt);
port.write('B');
port.write(blueInt);
port.write('G');
}
The weird thing is, that the problem is still there, green and blue led’s flashing every few seconds, randomly, with this code:
port.write(redInt);
port.write('R');
port.write(0);
port.write('B');
port.write(0);
port.write('G');
I’m guessing the problem is simply the way I send and read the data in the first place, but I wasn’t successful at my attempts to fiddle with buffers or bits.
[EDIT]
Here is a quick video of the problem, it isn’t very easy to see, but the green and blue leds flash occasionally, even though I should be sending “0” to them all the time.
