Receiving two values over serial port using servos

Question

So I have a java program that picks up the mouses x and y coords on the display and I would like to send those to my arduino and then move my two servos to those locations (I have two servos ontop of each other, one for x and one for y).

The java (processing) code i have is below

void draw(){ //same as loop in arduino
 background(52, 152, 219); // background color of window (r, g, b) or (0 to 255)
 //lets give title to our window
 fill(0, 255, 0); //text color (r, g, b)
 textFont(font);
 text("Ripple Effect Maker", 80, 30); // ("text", x coordinate, y coordinat)
 ellipse(mouseX, mouseY, 33, 33);
 int x = mouseX;
 int y = mouseY;
 port.write(x+":"+y);
 println(x+":"+y);
 //println("y="+y);
 delay(100);
}

I don't have much arduino code because I can't seem to find a way to split the data into two seperate variables and then move the servos to their corresponding variables.

Thanks for the help!

• Juraj: majenko.co.uk/blog/reading-serial-arduino

Answer 1

Your problem is that you aren't providing anything to split the data on. You just send the X and y coordinates with a : between X and y. There's nothing between the y and the next X.

By changing the line

port.write(x+":"+y);

To

port.write(x+":"+y+"\n");

You then get the linefeed character to split your data on.