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How to make an input from computer using processing (like a password form) and trigger pin in arduino? If you let some link to read more that would be very helpful.

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    What part are you having problems with? Sending data to Arduino from Processing or parsing data on the Arduino? Your question is very vague. Read up on arduino.cc/en/reference/serial – sachleen May 3 '14 at 20:55
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    What exactly are you trying to accomplish in your project? Please be more specific. – Paul May 3 '14 at 22:29
  • I want to enter a pass through processing and if its correct i want to trigger a pin. – TanJay May 4 '14 at 4:08
  • Should it be the PC or the arduino which checks the password? What happens if someone uses their own pc program instead of yours? – Chris Stratton May 4 '14 at 4:38
  • Arduino should have to contain the password – TanJay May 4 '14 at 4:42
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On the processing side you need to communicate with the arduino using the Serial class. To set up use something like the following. It is a bit of guess work to find which of the serial ports to use

Serial myPort;  
void setup() {
  // List all the available serial ports:
  println(Serial.list());

  // Open the port you are using at the rate you want:
  myPort = new Serial(this, Serial.list()[6], 9600);
  myPort.buffer(2); // sets the size of the buffer, I send two bytes at a time
}

You can read a write using the Serial.read() and Serial.write() see https://processing.org/reference/libraries/serial/index.html for the processing serial references.

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You need to have a look at the Serial commands: http://arduino.cc/en/Serial/read

http://arduino.cc/en/Tutorial/ReadASCIIString

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