Digital Kitchen Scale & Inverse Square Law Experiment Kit with Arduino Uno

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

Construct a precision digital scale using a 1 kg load cell and HX711 amplifier, then repurpose the very same setup to measure the attractive force between an electromagnet and a ferrous object at varying distances. As you record readings and plot them, the classic inverse square law of magnetism emerges from your own data-turning an abstract physics concept into a tangible, hands-on investigation. The onboard 16x2 LCD displays real-time force values, while the relay lets you safely control the 12V electromagnet from the Arduino circuit.

What You'll Build

You will assemble a calibrated digital weighing scale with a clear LCD readout, then modify it into an experimental rig where the load cell becomes a force sensor. A movable iron piece faces a fixed electromagnet, and you systematically increase the gap while logging the pull. Finally, you will collect multiple distance-force pairs, transfer them to a spreadsheet, and generate the characteristic 1/r� curve-a complete scientific workflow from circuit to conclusion.

What You'll Learn

• Interfacing and calibrating an HX711 load cell for precise milligram-level force readings
• Controlling a high-current electromagnet safely using a 5V relay and external 12V adapter
• Displaying live sensor data on a 16x2 LCD with I2C backpack for minimal wiring
• Designing and executing a physics experiment: varying distance, logging force, and verifying the inverse square relationship

Kit Contents

Why Buy This Kit Instead of Sourcing Parts Separately

Who This Kit Is For

Designed for CBSE Class 11-12 students investigating magnetism and error analysis in their physics practicals, as well as B.Tech ECE/EEE first-year learners building instrumentation skills. The project aligns with Smart India Hackathon hardware tracks and ATL Tinkering Lab challenges where sensor-based measurement meets applied physics. Even IIT, NIT, and VIT undergraduates use it to reinforce lab techniques before advanced courses.

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.