Build a Real-Time Sound Level Meter with Arduino Uno, OLED Display & LED Bar Graph

Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.

Capture every decibel of your environment with a self-contained meter that reacts instantly. Whether you’re proving the inverse square law in a physics lab, monitoring classroom noise levels, or prototyping a smart noise pollution sensor for a hackathon—this kit turns the MAX9814 microphone amplifier and Arduino Uno into a responsive, calibrated tool. The 0.96‑inch OLED shows a precise dB reading with peak hold, while eight LEDs dance in a bar graph that mirrors real‑time sound pressure, giving you both an instrument and a visual spectacle.

What You'll Build

A portable, battery-powered sound level meter that samples ambient audio 1,000 times a second through the MAX9814 mic amp. The Arduino processes the signal and displays calibrated dB SPL on a crisp OLED, with a peak-hold cursor that freezes the loudest moment. An 8‑LED bargraph lights up sequentially as sound level rises, converting raw voltage into an intuitive noise indicator that works from a whispered 30 dB to a shouted 90+ dB.

What You'll Learn

• Read analog signals from an electret microphone amplifier and convert them to meaningful SPL units
• Calibrate a sound level meter using a known reference sound pressure level
• Drive a 0.96‑inch I2C OLED display and render real‑time numeric values with peak‑hold logic
• Implement a dynamic LED bar graph by driving 8 GPIO pins based on thresholded dB levels

Kit Contents

Why Buy This Kit Instead of Sourcing Parts Separately

Who This Kit Is For

Designed for CBSE Class 11–12 students building investigatory physics projects on sound intensity, B.Tech ECE/EEE sophomores tackling embedded systems lab assignments, and ATL Tinkering Lab mentors guiding sensor‑driven prototypes. The real‑time audio visualization also fits Smart India Hackathon themes on noise pollution monitoring—giving teams a ready‑to‑deploy hardware frontend that can be extended with data logging or wireless alerts.

Built and Backed by Compoden

Every Compoden kit ships with an AI build companion trained on this exact project — accessible via a QR code on the box, with WhatsApp and email backup. We've spent 10 years building projects for makers, schools, and institutions across India. If a part fails because of a manufacturing defect, replace it free within 7 days.