Build a Doppler Effect Speed Calculator with Arduino Uno – STEM Demo Kit

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

You've heard a siren change pitch as it passes by — now you can measure that exact effect and calculate the speed of the moving source. This Arduino-powered kit turns the classic Doppler phenomenon into a hands-on physics lab that's perfect for school science fairs and classroom demos.

What You'll Build

With all components included, you'll assemble a breadboard circuit where a passive buzzer moves (swing it by hand or mount on a toy car) while the MAX9814 microphone amplifier captures the changing pitch. The Arduino reads the audio frequency, detects the shift from the stationary frequency, and displays both the instantaneous frequency and calculated speed on the 16x2 LCD screen. It's a real-time physics experiment that makes abstract wave concepts concrete.

What You'll Learn

• How the Doppler effect changes perceived frequency when a sound source moves toward or away from an observer
• Sampling analog audio signals and extracting the dominant frequency with Arduino code
• Using an I2C LCD backpack to reduce wiring and display live sensor data
• Applying the Doppler shift formula (Δf/f = v/c) to compute speed from measured frequencies

Kit Contents

Why Buy This Kit Instead of Sourcing Parts Separately

Who This Kit Is For

This kit is designed for students in CBSE Class 8–12, ICSE, and state board physics who need a working model for science exhibitions or internal assessments. It's also a favourite in ATL Tinkering Labs and for Smart India Hackathon junior challenges where sensor-based demos are required. First-year B.Tech ECE/EEE students can use it as a quick DIY signal processing example.

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.