Doesnt work with latest esp32 boards in Arduino IDe

[rachelbryan]

Installing latest esp32 boards in Arduino IDE breaks your great library

[SaifSabban]

On both ESP32 Pico and ESP Wroom, error comes up on compiler as "'QRCode' does not name a type"

[Invisibleman1002]

I followed someone else advice and renamed the QRCode.h and QRCode.C file.
I chose qrcoderm, as in qrcode(r)ic(m)oo. Welcome to pick your own name.

#include <qrcoderm.h>

I also renamed the libraries folder to 'qrcoderm'.
You need to change line 33 in the qrcoderm.c. to the new include name as well.

After that, the library compiled and code was uploaded to me ESP32_DevKitc_v4.

Good luck!

[stshady]

I still can not compile it for ESP32 with Arduino IDE, even after renaming. Tried on two different installations - no luck.
Any advice please? I would like to make a QR code and print it on a thermal printer.

[MYCAMEL222]

I think I figured this out. I was in the same boat as all of you above..

I tracked down the ESP32 board folder and deleted the QRCode folder in ESP32..

"C:\Users\xxxxx\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.9\tools\sdk\esp32\include\qrcode"

My code immediately compiled with no errors.

Remember to do the same if you install board updates.

[DarrellChan]

I think I figured this out. I was in the same boat as all of you above..

I tracked down the ESP32 board folder and deleted the QRCode folder in ESP32..

"C:\Users\xxxxx\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.9\tools\sdk\esp32\include\qrcode"

My code immediately compiled with no errors.

Remember to do the same if you install board updates.

This solved my compilation error. Note that if AppData folder might be Hidden.

[ricmoo]

I’m back into doing more ESP32 work now; I should consider renaming the component folder.

Thanks for the info. :)

[c9obvi]

I’m back into doing more ESP32 work now; I should consider renaming the component folder.

Thanks for the info. :)

Thank you for the library and please do come back to the ESP32 world!

[MadOrkestra]

I’m back into doing more ESP32 work now; I should consider renaming the component folder.

Thanks for the info. :)

Welcome back, renaming does the trick, can you please merge and release the pull request #36

[Alexander96f]

is there still not a good fix for this? its a pain in the ass

[noiasca]

I solved the naming conflict by renaming the library files:

go into the Arduino IDE libraries folder of this QRCode library:
rename qrcode.h to unoqrcode.h
rename qrcode.c to unoqrcode.c

open unoqrcode.c and edit line 32 to #include "unoqrcode.h"
open unoqrcode.h and add at top of the code (line 32) #pragma once

now open the example sketch
Edit in line 12 the include to #include "unoqrcode.h"

The example now compiles also on the ESP32.

You now have an adopted library and no naming conflicts to the ESP32 boards (as of 2025-05-25)
An ESP32 Core update shouldn't mess around with your user sketch.
You can still use the origin qrcode implementation of the ESP32 Core.

[cray2015]

@noiasca it works but can you state the reason what is the issue? and why this works specifically?

[ricmoo]

Just as an FYI, I do use this in one of my other projects, which is based on the ESP32-c3.

I’ll get the fixes ported from that project soon, but it will change the function names, I’ve been prefixing the names with ‘ffx_’ for my related C libraries.

[noiasca]

@noiasca it works but can you state the reason what is the issue? and why this works specifically?

because there is another file in the (ESP) Board Package with the same name like in this library. Renaming the file names and adopting the includes solves the problem with the duplicate names.

[MadOrkestra]

for everyone else landing here, https://github.com/yoprogramo/QRcodeDisplay works just fine.