1. Digital Soccer Draw Serial Ports

Serial communication is a very common and standardized protocol that allows two computers or devices to talk to each other via a series of digital pulses over a few wires (in this case a USB cable). In this example, we program the Arduino to read the analog value of a potentiometer plugged into a simple circuit.

I'm attempting to create a data exchange between sensors on an Ardunio (well actually a AtMega328PU based clone built on a breadboard, but I don't believe that that's the source of my problem) and a Processing script, and I'm getting some unexpected results. I was following the method of serial communication detailed here, but I get stuck with what appears to be no data actually traveling over the serial connection.

The Arduino code:

And the relevant parts of the Processing code:

And in Processing I get an output of:

Note: I know I have the correct port selected from the list, so that is not the issue.

I've tried debugging the issue and searching the internet for similar problems, both to no avail. Any help on this issue is greatly appreciated, Thanks!

1 Answer

I would first check if simply sending a simple message from Arduino to Processing works. Try something like this in Arduino:

and this in Processing:

If this simple setup works, you should be fine to move on to the next step and have two way communication. If the above doesn't work then there's something else causing issues with serial communication (in which case please report what errors you're receiving, if any or what behaviour you're experiencing)

In case the above works, you can try two way communication. Notice I'm making use of serialEvent() and bufferUntil. It's best to avoid blocking while loops wherever possible.

Arduino code:

Processing code:

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