๐ ๏ธ MAKER GUIDEMay 12, 2026โขโฑ๏ธ 1 min readโข๐ณ๐ต Tested in Nepal
School & Hospital Quiet Zone Sound Level Decibel Monitor
Measure ambient acoustic noise levels in classrooms, exam halls, and hospital wards with the high-sensitivity sound sensor module and RGB LED indicator.
๐ ๏ธ BILL OF MATERIALS (BOM)
Required Hardware & Component Checklist
Curated components verified for this project. Check the items you need, adjust quantities, and add straight to cart:
Estimated Total (5/5 items):
NPRย 1,820
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All parts selected
NPRย 180
NPRย 750
NPRย 350
NPRย 500
NPRย 40
School & Hospital Quiet Zone Sound Level Decibel Monitor
Monitor room noise in libraries and exam halls using the Sound Detection Microphone Sensor Module, WS2812 RGB LED Ring, and Arduino Nano.
Hardware Bill of Materials:
- Acoustic Sensor: High Sensitivity Sound Detection Microphone Sensor Module LM393
- Microcontroller: Arduino Nano V3.0 Solderless
- Visual Indicator: WS2812 Round Modules RGB LED Ring
- Display: 0.91 inch OLED module blue OLED 128X32 GND-VCC-SCL-SDA
- Warning Alarm: Active Buzzer (5V)
Circuit Pinout & Wiring Connections:
| Module / Sensor Pin | Arduino Nano Pin | Function / Description |
|---|---|---|
| Sound Sensor VCC / GND | 5V / GND | Microphone Amplifier Power |
| Sound Sensor Analog (AO) | Pin A0 | Peak-to-Peak Acoustic Waveform |
| WS2812 Ring DIN | Pin D6 | Green/Amber/Red Decibel Level Display |
| 0.91" OLED SDA / SCL | Pin A4 / Pin A5 | I2C Decibel (dBA) Readout |
| Active Buzzer (+) | Pin D4 | Gentle Chime when Noise > 75dB |
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