Simple and safe: int answer 42 Serial.print ('The answer is ') Serial. The processing program would need to look for the : as the marker for the start of the 1st temperature, the as the marker for the end of the first temperature and the start of the second temperature, and the ! as the marker for the end of the second temperature. However, it is always better to avoid using String objects if at all possible, because they use dynamic memory allocation, which carries some risk of memory fragmentation. The processing program would then receive the characters: If you put some delimiter between the values you send, like this: The Serial.print on the arduino is converting the byte to a string, and sending the string one character at a time. When I upload the code to the arduino, and start the processing program, I get this output: If (byteCount > 5) // don't do anything until you get 3 characters (header plus the two data bytes The processing code looks like this: //import Serial communication libraryįont24 = createFont(PFont.list(), 12) ĬommPort = new Serial(this, "COM4", 9600) TempC = 54 //convert the analog data to temperature The arduino code looks like this: int tempC If(commPort.read() = 255) // only proceed if you get your header If (commPort.available() > 2) // don't do anything until you get 3 characters (header plus the two data bytes setup fonts for use throughout the applicationĬommPort = new Serial(this, "COM7", 9600) Serial.print((int)tempC) //send the int data to the computer- does not workĪnd here if the Processing code //import Serial communication library Serial.print((byte)tempC) //send the byte data to the computer- works TempC = 254 //convert the analog data to temperature Serial.print((byte)255) //send the header Serial.begin(9600) //opens serial port, sets data rate to 9600 bps This is the arduino code //declare variables I first tried that with "byte" variables and it went fine. Serial. I am working on my first project submitting two temperatures to Processing. The Arduino programming language Reference, organized into Functions, Variable and Constant, and Structure keywords.
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