Comments on: ESP32-CAM QR Code Reader/Scanner (Arduino IDE)

By: Neithan

Neithan — Mon, 26 Jan 2026 12:32:47 +0000

Hello! I am wondering if the library used can support the ESP32 S3 Freenove board.

By: Saim

Saim — Wed, 19 Nov 2025 06:58:58 +0000

Hello, does this work on qr codes that have circular data modules, alignment markers, timings etc?? like an artistic qr code that is completely circle

By: Sara Santos

Sara Santos — Wed, 24 Sep 2025 19:37:10 +0000

In reply to yezi.

Hi.
Our tutorials with the OV2640 camera are not compatible with other cameras.
Regards,
Sara

By: Sara Santos

Sara Santos — Wed, 24 Sep 2025 19:29:13 +0000

In reply to Jens.

Hi.
Thanks for sharing.
Probably a new update of the boards made this being required.
Thanks.
Regards,
Sara

By: yezi

yezi — Mon, 22 Sep 2025 07:56:23 +0000

hey guys, I’m currently using OV5640 cam module instead of OV2640, cuz i wanna scan smaller qr and OV5640 has 5mp camera. But it turns out it can’t read the qr even though i adjusted the lenses to clearer quality. is there any ways to solve this issue? (im using esp32 ca mb – ai thinker board). ty

By: Jens

Jens — Sun, 21 Sep 2025 23:16:27 +0000

For anyone having problems with non-functioning code (especially constant rebooting):

In the Arduino IDE under “Tools,” you need to configure the following settings:
Board: “AI Thinker ESP32-CAM”
Port: The port used by the system. Check the Device Manager if necessary.
CPU Frequency: “240MHz (WiFi/BT)”
Core Debug Level: As you like (e.g., “Debug”)
Flash Frequency: “80MHz”
Flash Mode: “DIO” (Important!!!)
Partition Scheme: “Huge App (3MB No OTA/1MB SPIFFS)” (Important!!!)

By: yezi

yezi — Thu, 28 Aug 2025 10:03:33 +0000

In reply to Selin. alright, thanks!

By: Selin

Selin — Tue, 26 Aug 2025 11:27:28 +0000

In reply to Murat Suzen. Read my latest comment, I've solved it.

By: Selin

Selin — Tue, 26 Aug 2025 10:57:54 +0000

In reply to yezi. In the Arduino IDE go to Tools > Board > Boards Manager... In the boards manager list look for esp32 by Espressif Systems (NOT the one by Arduino), then click on the drop-down menu. Install and select version 3.2.1. This will essentially downgrade the core. My assumption was proven correct, as this solved the bootloop issue completely. If you want to use the QR code reader library, do not update the core to 3.3.0 yet, as the library is still behind.

By: yezi

yezi — Sat, 23 Aug 2025 03:38:20 +0000

In reply to yezi. still i can't solve the problem, guys if anyone who fixed their qr code scanning using this library, maybe ya'll can share it here. thanks.