STEAM & WELLBEING PROJECTS
Monitoring Environmental Quality and Noise in the Classroom
By POWAR STEAM
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March 15, 2025
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2 min read
Excessive noise in hallways and classrooms isn't just annoying: according to neuroeducational studies, levels above 65 dB reduce reading comprehension and increase cognitive fatigue in both students and teachers.
In this hands-on project, we explain how to use the P-Bit's native microphone (Mic) and comfort sensors to build a sound traffic light and an acoustic health map of the school.
1. The Hardware: The P-Bit's Microphone and How It Works
Unlike digital sensors such as the DHT11, the P-Bit's microphone captures the wave amplitude of ambient sound and translates it into a continuous analog signal (ADC). This lets students grasp the physical concept of frequency and sound pressure intuitively.
Visualization on the TFT Screen
On the P-Bit's built-in screen, acoustic intensity is shown as an animated bar indicator or through the RGB LED changing color (Green = Comfort, Yellow = Caution, Red = Excessive Noise).
2. Classroom Activity: The Acoustic Traffic Light
Using the P-Blocks visual coding platform, students build the sound traffic light code in just 5 minutes:
READ Microphone (Analog)in a continuous loop.IF Noise < Silence_Level→ Turn on Green LED (Calm).IF Silence_Level < Noise < Alert_Level→ Turn on Yellow LED.IF Noise > Alert_Level→ Turn on Red LED + Warning buzzer.
3. Creating the School's Sound Map
Each team moves its P-Bit to different areas throughout the school day (cafeteria, library, gym, hallways during class changes) to gather real acoustic intensity readings and tabulate decibel peaks.
4. Results and Community Awareness
The project concludes with a collective analysis where students design informational posters and present noise self-regulation recommendations to the school community.