Let the room see its own volume
The classroom noise meter listens through your device’s microphone and turns a big traffic light green, yellow or red depending on how loud the room is. A bar shows the current level, and two sliders set where yellow and red begin – a quiet reading lesson needs different limits than group work.
Red only switches on when the noise stays above the limit for a moment, so one dropped book doesn’t count. The meter counts how often the room hit red, and an optional soft beep reminds everyone to lower their voices. The sound is analyzed live in your browser and never recorded or uploaded.
How to use
- Press Start and allow microphone access when your browser asks.
- Watch the bar for a minute of normal work, then move the yellow and red sliders to fit your room.
- Put the traffic light in fullscreen on the projector or smartboard.
- Optional: switch on the beep. Press Stop to turn the microphone off.
Ideas for using it
- Group work. a visible goal: “Let’s stay in yellow while we discuss.”
- Silent reading and tests. set low limits so even whispering shows up.
- Lunch rooms and libraries. a calm reminder without a teacher having to call out.
- Class rewards. count the red moments and reward a lesson with fewer than three.
Is this a real decibel meter?
No. Microphones and devices differ a lot, so the meter shows a relative level from 0 to 100 rather than calibrated decibels. That is exactly what a classroom needs: you set what “too loud” means in your room, and the traffic light holds everyone to it. Use the sensitivity setting if your microphone is very quiet or very sensitive.