Reading inputs into processing

nimeta

Reading inputs into processing

in Integration and Hardware • 2 years ago

I'm trying to read several digital inputs from an Arduino with shift registers into Processing, and run some separate action for each switch.

I can't figure out why it won't read anything but A=0 :(

My Arduino sends out info like this:

if (zero) {
Serial.print("A"); // button from chip1, pin1 HIGH
Serial.print(0);
Serial.print(10, BYTE); // ASCII 10 = newline character, used to separate data strings
}
else {
Serial.print("A"); // button from chip1, pin1 LOW
Serial.print(1);
Serial.print(10, BYTE);
}

So from the Arduino serial monitor I see:

etc.

My Processing code is this:

import processing.serial.*;
String buff = "";
String temp = "";
int NEWLINE = 10; // this is the ASCII code for a newline character
int input_A = 0;
int input_B = 0;
int val = 0; // for debugging and testing
Serial myPort;
void setup() {
size(210, 480);
noStroke();
background(204);
//println(Serial.list());
// print a list of all available ports
String portName = Serial.list()[0];
myPort = new Serial(this, portName, 9600);
}
void draw() {
while (myPort.available() > 0) {
serialEvent(myPort.read());
val = myPort.read();
//call to function "serialEvent" --> see below
}
//do something with sensor A input:
switch (input_A) {
case 0:
fill(255, 255, 255);
break;
case 1:
fill(100, 127, 100);
break;
}
rect(30, 120, 60, 240);
//do something with sensor B input:
switch (input_B) {
case 0:
fill(255, 255, 255);
break;
case 1:
fill(100, 127, 100);
break;
}
rect(120, 120, 60, 240);
println(val);
delay(200);
}
void serialEvent(int serial) {
if(serial != NEWLINE) {
buff += char(serial);
}
else {
if (buff.length() > 1) {
temp = buff.substring(0, buff.length()-(buff.length()-1));
//this isolates just the first letter to identify the sensor
}
if (temp.equals("A") == true) { // identifies pin A value
temp = buff.substring(1, buff.length());
input_A = int(temp); //get pin A value;
}
if (temp.equals("B") == true) { // identifies pin B value
temp = buff.substring(1, buff.length());
input_B = int(temp); //get pin B value;
}
}
}

Replies(1)

PhiLho

Re: Reading inputs into processing

2 years ago

Arduino questions should go to Integration & Hardware section (moved): please, choose the most specific section appropriate to your question, otherwise we would have made only a Programming Questions section as nearly all questions are programming related!

That said, I know nothing about Arduino, but I feel you shouldn't call serialEvent yourself, as such methods are usually called by the system or the library when... an event occurs.
If I am wrong, I hope somebody knowledgeable will correct me.

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