Be quiet for a minute, guys!

There is a Noise sensor in a small room, with the sensitivity level set at nearly maximum (so it's triggered when it picks up any sound). However, it is connected to a Sensor Inverter, so it's triggered only when it registers complete silence. Additionally, it is connected to the LED Progress sensor extension that gradually fills up a LED chain when there is silence. Players need to deduce that when they don't make any noise, the LED diodes fill up. Once they are full, the electromagnet opens and they can go to the next room. This puzzle is great as players constantly make noise. Also, the door can be open before the game (because there is silence) but once they enter and start making noise, it's closed again. Electronics needed: 📣 Noise sensor, 🔀 Sensor Inverter, ⏱ LED Progress sensor extension, 🧩 Universal puzzle controller, 🧲 Electromagnet output set (180 kg)