ESP32 QR Code Reader

This library provides a interface to read QR Codes using an ESP32 with a camera.

Internally this lib uses a slight modified version of the Quirc library and some code from OpenMV port on the MaixPy project.

Demos

EN-US - See demo video at https://twitter.com/alvaroviebrantz/status/1290116219199279104?s=20
PT-BR - Veja video de demo em https://twitter.com/alvaroviebrantz/status/1290116405824806912?s=20

Usage

Is recommended to use PlatformIO to install this lib. Add ESP32QRCodeReader to your platformio.ini file.

From PlatformIO library:

lib_deps=
  ESP32QRCodeReader

Directly from Github:

lib_deps =
  alvarowolfx/ESP32QRCodeReader

Examples

This library comes with a number of example sketches. See File > Examples > ESP32QRCodeReader within the Arduino application. You can see them on the examples folder on this repository.

Basic example:

#include <ESP32QRCodeReader.h>

// See available models on README.md or ESP32CameraPins.h
ESP32QRCodeReader reader(CAMERA_MODEL_AI_THINKER);

void onQrCodeTask(void *pvParameters)
{
  struct QRCodeData qrCodeData;

  while (true)
  {
    if (reader.receiveQrCode(&qrCodeData, 100))
    {
      Serial.println("Found QRCode");
      if (qrCodeData.valid)
      {
        Serial.print("Payload: ");
        Serial.println((const char *)qrCodeData.payload);
      }
      else
      {
        Serial.print("Invalid: ");
        Serial.println((const char *)qrCodeData.payload);
      }
    }
    vTaskDelay(100 / portTICK_PERIOD_MS);
  }
}

void setup()
{
  Serial.begin(115200);
  Serial.println();

  reader.setup();
  reader.beginOnCore(1);
  xTaskCreate(onQrCodeTask, "onQrCode", 4 * 1024, NULL, 4, NULL);
}

Limitations

Need an ESP32 module with PSRAM - See below.

Compatible Hardware

The QR Code recognition lib required a lot of memory, so I was only able to get this to work with an ESP32 that has PSRRAM available and also the Quirc library is modified to use that directly.

ESP32 module
PSRAM Available
Camera module - Tested with OV2640

ESP32 modules with camera that have PSRAM and should work:

CAMERA_MODEL_WROVER_KIT
CAMERA_MODEL_ESP_EYE
CAMERA_MODEL_M5STACK_PSRAM
CAMERA_MODEL_M5STACK_V2_PSRAM
CAMERA_MODEL_M5STACK_WIDE
CAMERA_MODEL_AI_THINKER

ESP32 modules without PSRAM that will not work:

CAMERA_MODEL_M5STACK_ESP32CAM
CAMERA_MODEL_TTGO_T_JOURNAL

License

This code is released under the MIT License.

jhrendon/ESP32QRCodeReader