I have assigned the ledPin to various different digital pins and it has not made a difference. First, I recommend to use serialEvent when receiving data.
I don't have a possibility to test your code, but I am pretty sure that you receive not the char itself, but maybe its code. Try to somehow understand what you receive on the arduino side. One of the biggest pitfalls is that I cannot use the serial monitor of the Arduino to check what data its receiving while the Processing sketch is running. Is there a way to print in Processing the data contents of the serial port myPort being sent to the mega? I have tried using println myPort ; but this just seems to print the address?
Managed to get the Arduino and Processing sending and receiving data between one another! Thanks Ater! I used a serialEvent in the Processing code and this seemed to make the difference! Once I realised that I could use serial. Howdy, Stranger! This is called our setup method. It's where we 'set up' our program.
Here, we're using it to start serial communication from the Arduino to our computer at a baud rate of For now, all you need to now about baud rate is that basically it's the rate at which we're sending data to the computer, and if we're sending and receiving data at different rates, everything goes all gobbledy-gook and one side can't understand the other.
This is bad. After our setup method, we need a method called loop , which is going to repeat over and over as long as our program is running. For our first example, we'll just send the string 'Hello, world!
Type the following in your Arduino sketch, below the code we already wrote:. That's all we need for the Arduino side of our first example.
We're setting up serial communication from the Arduino and telling it to send data every milliseconds. Your Arduino sketch should now look something like this:. Now we're ready to see if we can magically or through code detect the 'Hello, world! Our task now is to find a way to listen in on what our Arduino sketch is sending.
Luckily, Processing comes with a Serial library designed for just this kind of thing! If you don't have a version of Processing, make sure you go to Processing. Once Processing is installed, open it up. You should see something like this:. Looks a lot like Arduino, huh? The Arduino software was actually based in part off of Processing - that's the beauty of open-source projects.
Once we have an open sketch, our first step is to import the Serial library. You should now see a line like import processing. Underneath our import statement we need to declare some global variables. All this means is that these variables can used anywhere in our sketch. Add these two lines beneath the import statement:. In order to listen to any serial communication we have to get a Serial object we call it myPort but you can it whatever you like , which lets us listen in on a serial port on our computer for any incoming data.
We also need a variable to recieve the actual data coming in. In this case, since we're sending a String the sequence of characters 'Hello, World! Just like Arduino has setup and loop , Processing has setup and draw instead of loop.
For our setup method in Processing, we're going to find the serial port our Arduino is connected to and set up our Serial object to listen to that port. Remember how we set Serial. Well, if we don't want that gobbledy-gook I was talking about, we had better put as that last argument in our Serial object in Processing as well.
This way Arduino and Processing are communicating at the same rate. Happy times! In our draw loop, we're going to listen in on our Serial port and we get something, stick that something in our val variable and print it to the console that black area at the bottom of your Processing sketch.
Over and over. Like this:. We've now conquered how to send data from Arduino to Processing. Our next step is figure out how go the opposite way - sending data from Processing to Arduino. So we've sent data from Arduino to Processing, but what if we want to send data the other way - from Processing to Arduino?
Piece of cake! Let's start with the Processing side of things. It starts out much like our last sketch: we import the Serial library and declare a global Serial object variable for our port up top, and in our setup method we find our port and initialize Serial communication on that port with our Serial variable at baud.
We're also going to use the size command, to give us a little window to click in, which will trigger our sketch to send something over the Serial port to Arduino. In our draw loop, we send whatever we want over the serial port by using the write method from the Processing Serial library.
For this sketch, we will send a '1' whenever we click our mouse in the Processing window. We'll also print it out on the console, just to see that we're actually sending something. If we aren't clicking we'll send a '0' instead.
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