Are photos of the screen blocked?

No, nothing prevents a photo of the lecturer’s screen. In dynamic mode a photo only works for the rest of that interval plus 10 seconds.

Does each student get their own QR code?

No. Everyone in the session sees the same code in a given interval. What ties a signature to a person is the student’s account and registered phone, not the QR code.

What does a student do if they cannot scan?

They type the 8 character unique code from the lecturer’s screen. This code does not change on its own; the lecturer can generate a new one if needed, and the old one stops working.

What happens to the QR code during a pause?

While a roll call is paused the dynamic code does not refresh, and a student who scans is told it is paused. Once the lecturer resumes, the new QR code is scanned.

Static or dynamic QR code for attendance? | DAS

When starting a roll call, the lecturer sets “QR Mode” to “Dynamic” or “Static”. Both modes follow the same signing rules; the difference is how long a code stays valid.

All comparisons

Short answer

A static QR code stays the same all session, so a photo of it works until the roll call closes. A dynamic code, preselected for class roll calls, is regenerated on the server every 10 seconds by default, adjustable from 5 to 30; a shared photo works only for the rest of that interval plus 10 seconds.

Criterion	Static QR code	Dynamic QR code
When the code changes	One code is used for the whole session and never changes until the roll call closes.	The code is regenerated on the server at the interval the lecturer chose. The default is 10 seconds, and the panel allows 5 to 30.
If a photo is shared	A photo of the code stays valid as long as the roll call is open.	A photo only works for the rest of that interval and the next 10 seconds. Nothing stops someone taking a photo; the code simply goes stale quickly.
A scan that arrives late	Since the code does not change, no grace time is needed.	If a student scanned in time but the interval ended while the app waited for location and device data, the previous code is accepted for 10 more seconds.
Screen and projector	The code on screen does not change. The event module also offers a single QR layout for posters.	Each new code is sent only to the lecturer’s live screen, never to students. The screen must stay on and projected for the whole session.
If the live connection drops	The lecturer’s screen fetches the QR code again every 15 seconds.	The lecturer’s screen fetches the QR code again every 2 seconds. In both modes the student’s signature is checked online.
Signing rules	The registered phone, one signature per roll call and, if the institution turns it on, the location check all apply to a static code too.	The same rules apply. Everyone sees the same code in a given interval; there is no per-student QR code.
How it is chosen in DAS	Set “QR Mode” to “Static” under “Advanced Settings”. The event manager’s permanent session only works with a static code.	“Dynamic” comes preselected for class roll calls. The “Refresh Rate” is set when the roll call starts.

When the code changes

Static QR code

One code is used for the whole session and never changes until the roll call closes.

Dynamic QR code

The code is regenerated on the server at the interval the lecturer chose. The default is 10 seconds, and the panel allows 5 to 30.

If a photo is shared

Static QR code

A photo of the code stays valid as long as the roll call is open.

Dynamic QR code

A photo only works for the rest of that interval and the next 10 seconds. Nothing stops someone taking a photo; the code simply goes stale quickly.

A scan that arrives late

Static QR code

Since the code does not change, no grace time is needed.

Dynamic QR code

If a student scanned in time but the interval ended while the app waited for location and device data, the previous code is accepted for 10 more seconds.

Screen and projector

Static QR code

The code on screen does not change. The event module also offers a single QR layout for posters.

Dynamic QR code

Each new code is sent only to the lecturer’s live screen, never to students. The screen must stay on and projected for the whole session.

If the live connection drops

Static QR code

The lecturer’s screen fetches the QR code again every 15 seconds.

Dynamic QR code

The lecturer’s screen fetches the QR code again every 2 seconds. In both modes the student’s signature is checked online.

Signing rules

Static QR code

The registered phone, one signature per roll call and, if the institution turns it on, the location check all apply to a static code too.

Dynamic QR code

The same rules apply. Everyone sees the same code in a given interval; there is no per-student QR code.

How it is chosen in DAS

Static QR code

Set “QR Mode” to “Static” under “Advanced Settings”. The event manager’s permanent session only works with a static code.

Dynamic QR code

“Dynamic” comes preselected for class roll calls. The “Refresh Rate” is set when the roll call starts.

For class roll calls a dynamic QR code is the right fit. It is the DAS default, and a photo of the code sent outside the room goes stale quickly.

A static QR code suits events where the code must stay the same for a long time: a seminar, a permanent check-in point or a printed poster. Because a photo works for the whole session, it is not a strong safeguard on its own.

Whichever mode is chosen, the registered phone, one signature per roll call and the institution’s location rule apply in the same way.

No. In the panel the refresh rate is set between 5 and 30 seconds, with 10 seconds as the default.