From b91924f79b939e8af8e58774a8da4206bb87aad9 Mon Sep 17 00:00:00 2001 From: Aminda Suomalainen Date: Sun, 16 Mar 2025 13:02:30 +0200 Subject: [PATCH] n/qr: initial commit Resolves: #427 --- n/qr.md | 109 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 109 insertions(+) create mode 100644 n/qr.md diff --git a/n/qr.md b/n/qr.md new file mode 100644 index 0000000..1a5b8d8 --- /dev/null +++ b/n/qr.md @@ -0,0 +1,109 @@ +--- +layout: mini +comments: true +title: "QR CODE MAKING: BIGGER IS SMALLER" +permalink: /n/qr.html +sitemap: true +excerpt: + WHEN YOU MAKE QR CODES, CAPITAL LETTERS MEAN SMALLER QR CODE AND OTHER NOTES + ON MAKING THEM. +--- + +# QR CODE MAKING: BIGGER IS SMALLER + +_{{ page.excerpt }}_ + +That is a neat trick +[from Terence Eden's blog where the cause is also explained](https://shkspr.mobi/blog/2025/02/why-are-qr-codes-with-capital-letters-smaller-than-qr-codes-with-lower-case-letters/). + + + + + + +Automaattinen sisällysluettelo / Automatically generated Table of Contents + +- [qrencode](#qrencode) +- [WiFi QR codes](#wifi-qr-codes) + - [iwd Device Provisioning Protocol](#iwd-device-provisioning-protocol) +- [Other methods of generating QR codes](#other-methods-of-generating-qr-codes) +- [QR code readers](#qr-code-readers) + - [See also](#see-also) + + + + + + +## qrencode + +`qrencode` is my favourite method of creating QR codes, with the above fact a +small QR pointing to my website would be: + +- `qrencode -t utf8 -i https://aminda.eu` + - `-t utf8` outputs to terminal as unicode and `-i` ignores case turning input + UPPERCASE. + +However my former goto was: + +- `qrencode -l H -t utf8 https://aminda.eu` which would feature higher error + correction allowing more damage (including art) while still working. + +Storage: + +- `qrencode -i -s 6 -l H -o aminda.eu https://aminda.eu` + - This `-s 6` doubles the pixel size, `-l H` uses highest error correction and + `-o aminda.eu` outputs the image to `aminda.eu.png`. This could be converted + through `magick aminda.eu.png aminda.eu.jpg` + +However usually I end up to +[qr.bash](https://gitea.blesmrt.net/mikaela/scripts/src/branch/master/bash/qr.bash). + +## WiFi QR codes + +For details on the specification, please refer to +[Barcode Contents on zxing wiki instead](https://github.com/zxing/zxing/wiki/Barcode-Contents#wi-fi-network-config-android-ios-11). + +- Open network with SSID `openwireless.org_nomap`: + `qrencode -t utf8 "WIFI:T:nopass;S:openwireless.org_nomap;;"` + ([wifiqr-open.bash](https://gitea.blesmrt.net/mikaela/scripts/src/branch/master/bash/wifiqr-open.bash)) +- WPAX protected network with SSID `Hollow` and key `Bastion`: + `qrencode -t utf8 "WIFI:T:WPA;S:Hollow;P:Bastion;H:false;"` + ([wifiqr.bash](https://gitea.blesmrt.net/mikaela/scripts/src/branch/master/bash/wifiqr.bash)) +- Hidden networks? Change the `H:false` to `H:true`. + +### iwd Device Provisioning Protocol + +If you are using iwd for WiFi management, forget the above and to add a new dpp +capable device onto your network, instead `iwctl dpp wlan0 start-configurator` +which requires `qrencode`. + +To stop provisioning new devices `iwctl dpp wlan0 stop`. + +Obviously don't include the dots and replace `wlan0` with your actual interface. + +## Other methods of generating QR codes + +- [DuckDuckGo search beginning with qrcode](https://start.duckduckgo.com/?q=qrcode+HELLO+WORLD) +- [Firefox add-on: Offline QR Code Generator](https://addons.mozilla.org/firefox/addon/offline-qr-code-generator/) + - This has spared me headache countless times on school computers for getting + URL stored to my browser from school computers or virtual machines without + complicated setups. +- [Chrome Web Store: QR Code](https://chromewebstore.google.com/detail/qr-code/cbimgpnbgalffiohilfglgkkhpegpjlo) +- BinaryEye & SecUSo for Android below + +## QR code readers + +- The stock Camera app. + - At least on iOS and SailfishOS. +- [BinaryEye](https://github.com/markusfisch/BinaryEye) is my go-to app for QR + codes and will tell you more than you might want to know about them. + [Google Play](https://play.google.com/store/apps/details?id=de.markusfisch.android.binaryeye) + [F-Droid](https://f-droid.org/en/packages/de.markusfisch.android.binaryeye/) +- [SecUSo: Privacy Friendly QR Code Scanner for Android ](https://github.com/SecUSo/privacy-friendly-qr-scanner) + [Google Play](https://play.google.com/store/apps/details?id=com.secuso.privacyFriendlyCodeScanner) + [F-Droid](https://f-droid.org/repository/browse/?fdid=com.secuso.privacyFriendlyCodeScanner) + +### See also + +- [Mikaela/gist directory vcard](https://gitea.blesmrt.net/mikaela/gist/src/branch/master/vcard)