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Author Topic: Serial communication with processing [SOLVED]  (Read 718 times)
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Please help...been stumped all day...

 

I am sending data to arduino from processing in the form of "+a123"

where + just tells the arduino that data is behind it the a is a command and 123 is any integer value.

I have a GUI in processing with multiple sliders and each slider has a letter assigned (hence the "a") and the value of the slider is the integer behind the letter.

 

I am sending it out using lines like this using 9600 baud:

 

myPort.write("+a"+value);

 

on the arduino end I receive it using:

 

if (Serial.available() > 0){
   inByte = Serial.read();
    // only input if a letter, number, =,?,+ are typed!
    if ((inByte >= 65 && inByte <= 90) || (inByte >=97 && inByte <=122) || (inByte >= 48 &&     inByte <=57) || inByte == 43 || inByte == 61 || inByte == 63) {
    command.concat(inByte);
}
}// end serial.available
if (inByte == 10 || inByte == 13){
inByte = 0;
if(command.indexOf('+') == 0){

code = command.substring(1,2);
temp2 = command.substring(2);
code.toCharArray(carray,2);
temp2.toCharArray(carray,4);
value = atoi(carray);

if (code=="c"){  DO SOMETHING with value temp1}

 

The code is to control RGB LEDs with a processing GUI console.

 

I'll gladly post the whole code but I thought it would just make it harder to solve this.

 

 

 

Basically if I open up the serial monitor in arduino and type in commands such as +a123 followed by [ENTER]

My leds ramp up the red value to 123.

It works perfectly.

 

When I println the variables in processing..  the display shows good numbers...

When I connect the arduino to processing.... the sliders don't work with the leds

 

 

I am thinking the issue is in how I am sending data to arduino since its mixed letters and integer values but im not sure.  Since I cant open up the serial monitors while the arduino is connected to the com port, I am stuck and completely blind....

 

 

Any ideas?????
« Last Edit: May 01, 2013, 07:16:07 pm by fxmech » Logged

Los Angeles
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Just solved it... was missing that invisible CR...
added a myPort.write(13); and it works great now!!!
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