# Cards not scanning? Fix Classroom Mode problems

> What to do when your phone won’t connect, cards won’t read, the camera phone drops out, or the page reloads mid-lesson.

## Cards aren’t reading

Check the distance first. **Classroom** cards read from up to about 4 m, and **Large room** cards from up to about 7 m. If students sit further back, reprint with the larger **Card size**.

Cards must be printed at 100%, with the white border kept around each black square. Glossy laminate reflects the lights into the camera, so use matte or none. Sweep the phone slowly and hold on each card until it’s captured.

## Your phone won’t connect

On your phone, open quizzy.earth/study/classroom, choose **Camera**, and type the six letters the projector shows. If the phone says “No screen is showing that code”, check the letters against the projector and type them again. If that still fails, reload the page on the projector computer.

Before the lesson starts, you can also click **New code** on the projector computer and type the new letters on your phone. If your phone says “The lesson ended on the screen”, type the new code the projector is showing.

## The camera phone dropped out

If the projector stops hearing from your phone, it shows **Camera phone lost** in the corner, with a QR code and a code. If the phone reports a low battery, the same card appears early, with its battery level. Scan the QR code with another phone. Or open quizzy.earth/study/classroom on it, choose **Camera**, and type the code. Then carry on.

## Count the room by eye

No phone to hand? On the projector computer, click **Record answers**, then **Count by eye**. Ask everyone to hold up their card, count each letter, and click **Use this count**. A counted question records class totals, not each student’s answer, and nobody is marked wrong.

## Type or tap answers instead

On the projector computer, click **Record answers**. On the **Students** tab, type a card number and letter, like 12A, then press Enter.

On your phone, tap **Tap instead** to turn the camera off and see the class list. Tap a name, then the letter at the top of the card they’re holding. Tap **Use the camera** to scan again. If the phone says camera access was refused, allow it in the browser settings.

## The page reloaded mid-lesson

Open quizzy.earth/study/classroom again in the same browser on the projector computer. The lesson picks up where it was, with the same code. If your phone’s page reloads, it joins the same screen again on its own.

With a saved class, results are saved to your account after each question. If a question says it’s “not saved yet — retrying”, Quizzy keeps trying in the background. If saving still fails, the results screen offers **Retry** and **Keep on this laptop only**.

## A read was lost on the way

If your phone lists a student as “not counted: lost on the way, please re-scan”, ask that student to hold up their card again and scan it, as long as the question is still open. If it says “closed before it arrived”, the read came after you tapped **Done**. Tap **Dismiss** to clear a line.

## The count includes students who are away

Before you click **Start the quiz**, click each missing student in the room list so they show **Absent**. Absent students aren’t counted, so the phone waits only for the students who are there.

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Updated: 2026-10-16

Source: https://quizzy.earth/help/classroom-troubleshooting