Hi guys! Recently, I am working on an art project that needs Processing and Arduino. Now that I have some questions, I want to turn the following flowchart into automatic code behavior. I already have some basic code and it works. But I don’t know how to automatically get the updated QR code data and update the header file through the code in Processing. Can anybody help me?
Here’s the code in Processing :
// THIS IS NOT ARDUINO CODE! Runs in Processing IDE (www.processing.org).
// Convert image to C header file suitable for the Adafruit_Thermal library.
void setup() {
// Select and load image
selectInput("Select image file to convert:", "processImage");
}
void processImage(File image) {
String filename, basename;
PImage img;
PrintWriter output;
int pixelNum, byteNum, bytesOnLine = 99,
x, y, b, rowBytes, totalBytes, lastBit, sum;
println("Loading image...");
filename = image.getPath();
img = loadImage(image.getPath());
// Morph filename into output filename and base name for data
x = filename.lastIndexOf('.');
if(x > 0) filename = filename.substring(0, x); // Strip current extension
x = filename.lastIndexOf('/');
if(x > 0) basename = filename.substring(x + 1); // Strip path
else basename = filename;
filename += ".h"; // Append '.h' to output filename
println("Writing output to " + filename);
// Calculate output size
rowBytes = (img.width + 7) / 8;
totalBytes = rowBytes * img.height;
// Convert image to B&W, make pixels readable
img.filter(THRESHOLD);
img.loadPixels();
// Open header file for output (NOTE: WILL CLOBBER EXISTING .H FILE, if any)
output = createWriter(filename);
// Write image dimensions and beginning of array
output.println("#ifndef _" + basename + "_h_");
output.println("#define _" + basename + "_h_");
output.println();
output.println("#define " + basename + "_width " + img.width);
output.println("#define " + basename + "_height " + img.height);
output.println();
output.print("static const uint8_t PROGMEM " + basename + "_data[] = {");
// Generate body of array
for(pixelNum=byteNum=y=0; y<img.height; y++) { // Each row...
for(x=0; x<rowBytes; x++) { // Each 8-pixel block within row...
lastBit = (x < rowBytes - 1) ? 1 : (1 << (rowBytes * 8 - img.width));
sum = 0; // Clear accumulated 8 bits
for(b=128; b>=lastBit; b >>= 1) { // Each pixel within block...
if((img.pixels[pixelNum++] & 1) == 0) sum |= b; // If black pixel, set bit
}
if(++bytesOnLine >= 10) { // Wrap nicely
output.print("\n ");
bytesOnLine = 0;
}
output.format(" 0x%02X", sum); // Write accumulated bits
if(++byteNum < totalBytes) output.print(',');
}
}
// End array, close file, exit program
output.println();
output.println("};");
output.println();
output.println("#endif // _" + basename + "_h_");
output.flush();
output.close();
println("Done!");
exit();
}
Here’s the code in Arduino:
#include "Adafruit_Thermal.h"
#include "QRCODE.h"
#include "SoftwareSerial.h"
#define TX_PIN 6 // Arduino transmit YELLOW WIRE labeled RX on printer
#define RX_PIN 5 // Arduino receive GREEN WIRE labeled TX on printer
SoftwareSerial mySerial(RX_PIN, TX_PIN); // Declare SoftwareSerial obj first
Adafruit_Thermal printer(&mySerial); // Pass addr to printer constructor
const int Pushbutton = 3;
int value = 0;
int debounce_delay = 300; //Debounce delay
void setup() {
pinMode (Pushbutton, INPUT);
pinMode (7, OUTPUT);
mySerial.begin(19200);
}
void loop() {
value = digitalRead(Pushbutton);
if (value == HIGH){
delay(debounce_delay);
digitalWrite(7, HIGH);
printer.begin();
printer.setSize('M');
printer.println(F("Royal College of Art"));
printer.setSize('S');
printer.println(F("Information Experience Design"));
printer.setLineHeight(50);
printer.printBitmap(QRCODE_width, QRCODE_height, QRCODE_data);
printer.setLineHeight(50);
printer.println(F("Enjoy your memory ghost!"));
printer.setLineHeight(150);
printer.println(F(" "));
printer.sleep(); // Tell printer to sleep
delay(3000L); // Sleep for 3 seconds
printer.wake(); // MUST wake() before printing again, even if reset
printer.setDefault(); // Restore printer to defaults
}
}
