Using Processing to send data to Arduino

Question

 import processing.serial.*; import java.io.*; Serial myPort; int mySwitch; String transmitter[] = new String[1280000]; //initialize array void setup(){ mySwitch=1; //Open the serial port for communication with the Arduino //Make sure the COM port is correct myPort = new Serial(this, "COM6", 9600); myPort.bufferUntil('\n'); } void draw() { if(mySwitch == 1) { readData("input.txt"); int index = 0; while(index < 128000) { myPort.write(transmitter[index++]); if(index%128 == 0) delay(100); } } mySwitch = 0; } void readData(String myFileName){ File file=new File(myFileName); BufferedReader br=null; try{ br=new BufferedReader(new FileReader(file)); String transmit=null; int i = 0; /* keep reading each line until you get to the end of the file */ while((transmit = br.readLine()) != null) transmitter[i++] = transmit; }catch(FileNotFoundException e){ e.printStackTrace(); } catch(IOException e){ e.printStackTrace(); } finally{ try { if (br != null) br.close(); } catch (IOException e) { e.printStackTrace(); } } }

In the above code, I have an String array and I'm reading lines from a file and saving them as strings. How would I save them as byte/char inside an array of byte/char?

Basically, I have a file of integers on each line, each integer in the range [0, 255]. And I want to read this integer and send it to the Arduino. The Arduino serial.read() function reads a byte at a time. This is the issue I am trying to solve.

Hi, please could you give us an idea of what you have tried or written and what your results have been so far. — RSM
– RSM, Commented Apr 13, 2016 at 11:25
Well I am writing each index in my transmitter array and each index holds a "String" value. Thus, serial.write() will write a string to the serial port. However, I want it to write it as an integer for the purposes of speed and efficiency. — Jonathan
– Jonathan, Commented Apr 13, 2016 at 16:19
just a number in the range of [0, 255] on each line. No other splits such as comma, etc. — Jonathan
– Jonathan, Commented Apr 14, 2016 at 0:25

Jonathan · Accepted Answer · 2016-04-13 16:42:00Z

I believe I have actually found a very efficient solution to this problem by re-writing the code the following way by using the "Scanner" class and not the "BufferedReader" class. Any input on making this more efficient is welcome!

import processing.serial.*; import java.io.*; import java.util.*; Serial myPort; int mySwitch; Scanner file; byte transmitter[] = new byte[1280000]; //initialize array void setup(){ mySwitch=1; //Open the serial port for communication with the Arduino //Make sure the COM port is correct myPort = new Serial(this, "COM6", 9600); myPort.bufferUntil('\n'); } void draw() { if(mySwitch == 1) { readData("input.txt"); int index = 0; while(index < 128000) { myPort.write(transmitter[index++]); if(index%128 == 0) delay(100); } } mySwitch = 0; } void readData(String myFileName){ try{ file = new Scanner(new File(myFileName)); } catch(Exception e){System.out.println("NOT FOUND!");} int i = 0; while(file.hasNextByte()) transmitter[i++] = file.nextByte(); file.close(); }

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