Accurate Sound Pressure Level Meter Kit with Arduino Uno and MAX9814

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

Transform an Arduino Uno into a handheld sound pressure level meter that reads real-time dBA on a bright 16x2 LCD. The MAX9814 microphone amplifier captures audio, while the Arduino performs A‑weighted filtering and a peak‑hold function—giving you a tool accurate enough for classroom noise surveys, home studio monitoring, or science exhibition demonstrations.

What You'll Build

A compact, battery‑powered SPL meter that displays A‑weighted decibels and holds the maximum level at the press of a button. You’ll assemble the hardware on a breadboard, upload the pre‑written code, and calibrate it using simple reference tones. The finished device works straight away and teaches real‑world acoustics measurement.

What You'll Learn

• Read analog signals from the MAX9814 microphone amplifier into the Arduino ADC
• Implement a digital A‑weighting filter to match human ear sensitivity
• Drive a 16x2 LCD via I2C backpack for live dBA display
• Code a peak‑hold algorithm and store the maximum value

Kit Contents

Why Buy This Kit Instead of Sourcing Parts Separately

Who This Kit Is For

Ideal for CBSE Class 11‑12 physics practicals, ATL Tinkering Lab projects, and B.Tech ECE/EEE mini‑projects where sound measurement is required. Students from IIT, NIT, VIT, and BITS use such kits for hackathons like Smart India Hackathon. Hobbyists and school‑level science exhibitors will also find the build accessible and rewarding.

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.