# QR Code (/libs/qrcode)



The [QR-Code-generator library](https://github.com/nayuki/QR-Code-generator) by
[nayuki](https://github.com/nayuki) is a 3rd-party library that generates QR-Code
bitmaps.

The lv\_qrcode LVGL extension is an interface to that library which implements a custom
Widget that generates and displays QR Codes using the library.

Usage [#usage]

Enable <ApiLink name="LV_USE_QRCODE" /> in `lv_conf.h` by setting its value to `1`.

Use <ApiLink name="lv_qrcode_create" /> to create the QR-Code Widget.  Then use
<ApiLink name="lv_qrcode_update" /> to generate the QR Code on it.

If you need to re-modify the size and color, use
<ApiLink name="lv_qrcode_set_size" /> and <ApiLink name="lv_qrcode_set_dark_color" /> or
<ApiLink name="lv_qrcode_set_light_color" /> respectively, and then
call <ApiLink name="lv_qrcode_update" /> again to update the QR Code.

Notes [#notes]

* QR Codes with less data are smaller, but they are scaled by an integer
  value to best fit to the given size.

Example [#example]

Create a QR Code [#create-a-qr-code]

<LvglExample name="lv_example_qrcode_1" path="libs/qrcode/lv_example_qrcode_1" />

API [#api]