QR Quiz Broadcast
Students receive the quiz from their seats before it starts, but nobody can open it until they get their group's code. Students who already have it can pass it on to their neighbours. Simple version · Multiplex lab
Stay in your seat. Open the camera and point it at the screen. If the QR code looks small, zoom in.
You can read up to level
Tell your teacher your level and how far you sit from the screen. A level counts when at least 80 % of its frames are read.
The quiz is on your phone and locked. Enter your group's code when your teacher starts the quiz.
Reception data for research (optional)
Each time you receive a quiz, this phone records how the reception went: time, frames read, and whether packets came from the screen or from a neighbour's phone. Nothing from the quiz itself is recorded.
No receptions recorded yet.
GitHub settings
Use the token your teacher gives you. It stays on this phone and is sent only to GitHub.
- Before class: add one file per group, then encrypt. Print the code slips or keep the codes.
- At the start of class: play the stream fullscreen on the projector. Students receive it from their seats. Those who finish can share it with their neighbours.
- When everyone shows Quiz received: hand out the slips, or show a code on screen. Everyone opens the quiz at the same moment.
Each group gets its own file and code. Use one group if everyone takes the same quiz. Every phone receives all versions, so the total size sets the time: at the default settings about 30 s per 100 KB in total, for seats within a few metres.
Broadcast settings
A smaller QR size has bigger squares, so it reads from farther away but carries less per frame. Fewer frames per second give slower phones time to read each frame. Run the distance test to find what your room needs.
The projector cycles through all 7 QR sizes, about a second each. Students open the Student page and camera; their phone shows the largest level it reads reliably. Choose the level the back row can read.
Add the files, then encrypt.
| Group | Code |
|---|
Codes are saved only on this computer. Don't show them on the projector until the quiz starts.