anunpanya/esp8266_qrcode

esp8266_qrcode's Issues

fatal error: OLEDDISPLAY.h No such file or directory

Hi, I am new to Arduino, I came across this issue while running the example coding provided, it says no such file or directory, OLEDDISPLAY.h exist in the qrcode.h, is it my problem? I installed the library via Arduino IDE's library manager, am I not installing it properly?

resize qr code follow display size

https://github.com/anunpanya/QRGenerate/blob/master/qrgenerate.cpp

See void render() and void createQR().

edit line 37
for (byte x = 0; x <WD; x + = 2) {.
to
for (byte x = 0; x <WD; x + = pxSize) {.

Trial sample files In order to understand
https://github.com/anunpanya/QRGenerate/blob/master/examples/example/example.ino

some suggestions

first of all, thanks for sharing your lib :)

I've noticed that encoding takes ~30ms on my ESP32 which lead to low FPS when using QRs with the SSD1306-lib UI methods

• added buffering of QR String to compare and skip encoding when unnecessary
• added direct calls to display->setPixelColor, instead of having an extra method for that
• removed display->display() call to avoid rendering twice
• removed the white background and replaced it by a 2px wide border around the QR

the QR isn't centered in my code as i want to display some text next to it, just wanted to share some ideas so you can take what you like of it.

my QRCode.h

#include "OLEDDisplay.h"

class QRcode
{
    private:
        String QRBuffer = "";

	public:
		void create(String message);
		void render(OLEDDisplay *display, int x, int y);

        void render(OLEDDisplay *display, String message, int x, int y){
            create(message);
            render(display, x, y);
        }
};

my QRCode.cpp

#include <Arduino.h>
#include "qrcode.h"
#include "qrencode.h"

void QRcode::create(String message) {
    // encoding takes ~30ms so we rather buffer the message on encoding and return if nothing changed
    if(message.equals(QRBuffer))
        return;

    QRBuffer = message;
    message.toCharArray((char *) strinbuf, 260);
    qrencode();
}

void QRcode::render(OLEDDisplay *display, int x, int y) {

    int offsetX = x + (display->height() - WD) / 2;
    int offsetY = y + (display->height() - WD) / 2;

    display->fillRect(offsetX - 2, offsetY - 2, WD + 4, WD + 4);

    // print QR Code
    for (byte x = 0; x < WD; x += 2) {
        for (byte y = 0; y < WD; y++) {
            if (QRBIT(x, y) && QRBIT((x + 1), y)) {
                // black square on top of black square
                display->setPixelColor(offsetX + x, offsetY + y, BLACK);
                display->setPixelColor(offsetX + (x + 1), offsetY + y, BLACK);
            }
            if (!QRBIT(x, y) && QRBIT((x + 1), y)) {
                // white square on top of black square
                display->setPixelColor(offsetX + x, offsetY + y, WHITE);
                display->setPixelColor(offsetX + (x + 1), offsetY + y, BLACK);
            }
            if (QRBIT(x, y) && !QRBIT((x + 1), y)) {
                // black square on top of white square
                display->setPixelColor(offsetX + x, offsetY + y, BLACK);
                display->setPixelColor(offsetX + (x + 1), offsetY + y, WHITE);
            }
            if (!QRBIT(x, y) && !QRBIT((x + 1), y)) {
                // white square on top of white square
                display->setPixelColor(offsetX + x, offsetY + y, WHITE);
                display->setPixelColor(offsetX + (x + 1), offsetY + y, WHITE);
            }
        }
    }

    //display->display(); //disabled that call within the class as it would double render frames with the UI
}

increase the size of the input data

hello,
first of all thank you for your library.
Is there a way to increase the amount of characters that can be encoded into the qr code?
Using the library with a SSD1306 screen 128x64 size, the input string is limited to 160 characters.
Is there a way to increase the input data lenght? or a larger display is needed?
Thank you

update qr code by mit app

how to code for update the qr by mit app? thanks before #11

QR doesn't render correctly without Serial.print()s in qrcode.cpp

Great library! Would be nice if I can use the serial output for something else.

Exporting the QR code generated as bitmap to be used on SPI TFT display

Hi Anunpanya,

 I am currently using your library and would like to upgrade my screen to a 128*128 TFT SPI display. These displays are capable of displaying bitmap so I was wondering if your code can be made to dump out bitmap in a certain memory location of the esp8266 and then remap it to the TFT LCD screen. Really appreciate your great work here. 

I plan to pair up your library with that of
sumotoy/TFT_ILI9163C

Warm Regards,
Terrence

would it be feasible to have a nodemcu version?

Hi, @anunpanya just see the project, very interesting. I just wonder would it be ok to have a nodemcu version written in lua?

QR code looks like a jumbled mess

Hi,

I am trying to print a QR code onto an SSD1306 128x64 display but I'm having some issues, the QR code is a jobbled mess. it doesn't look like a QR code at all. I am just using the base example code:

Code:

#include <qrcode.h>
#include <SSD1306.h>

SSD1306  display(0x3c, SDA, SCL);
QRcode qrcode (&display);

void setup() {

    Serial.begin(115200);
    Serial.println("");
    Serial.println("Starting...");

    display.init();
    display.clear();
    display.display();


    // enable debug qrcode
    // qrcode.debug();

    // Initialize QRcode display using library
    qrcode.init();
    // create qrcode
    qrcode.create("Hello world.");

}

void loop() { }

Here is the QR code:
https://imgur.com/a/WMiXy87

Thanks all!

Generate WIFI qr code

Hello,
Is it possible to generate a wifi QR cocde ?
and what string should we write in qrcode.create

thanks a lot for the librarie

Using different QR version

Hi!

Is it possible to use a lower version of QR code? With lower resolution/memory