Arduino Battery Voltage Level Indicator Kit: Monitor Any 12V Battery with a 10-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.

Imagine a simple row of LEDs that lights up from red to green as your 12V battery charges — that's exactly what you'll build. Whether you're keeping an eye on a solar battery bank, a car battery, or just exploring how analog sensors work, this Arduino-based indicator gives you real-time visual feedback. The voltage divider scales the battery's voltage down to a safe range for the Arduino's analog input, then the code maps it to ten LEDs, creating an intuitive fuel gauge.

What You'll Build

You’ll assemble a breadboard circuit that reads the voltage of any 12V lead-acid battery and displays its level on a bright 10-LED bar graph. Each LED represents roughly 10% of the battery's capacity, so you can instantly see whether it’s full, half-empty, or in need of a recharge. The final project is a fully functional battery indicator that you can use at home, in the lab, or even mount inside an inverter enclosure.

What You'll Learn

• How a voltage divider works and how to calculate resistor values for safe ADC input
• Reading analog voltage with Arduino’s analogRead() and converting it to meaningful units
• Controlling multiple LEDs using digital pins and mapping sensor values to LED states
• Practical battery monitoring concepts like state-of-charge, voltage thresholds, and safe measurement

Kit Contents

Why Buy This Kit Instead of Sourcing Parts Separately

Who This Kit Is For

Perfect for CBSE Class 11–12 students exploring practical physics behind voltage dividers, B.Tech ECE/EEE first-years looking for a hands-on Arduino mini project, and ATL Tinkering Lab members who want a real-world sensor application. It’s also a smart choice for Smart India Hackathon teams prototyping battery monitoring ideas, and for hobbyists building backup power systems at home.

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.