Build a Real-Time Energy Cost Monitor with Arduino Uno & ACS712 Sensor

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

Plug this Arduino-based energy monitor into your home and see every appliance’s live power draw translated into rupees. The ACS712 current sensor non‑invasively tracks the current flowing to any 230V device, while the OLED displays power in watts, accumulated watt‑hours, and an estimated electricity cost — updated every second. No more guessing whether your AC or geyser is the real culprit; you’ll have hard numbers to make smarter energy choices.

What You'll Build

You’ll assemble a compact energy monitor that you can move from appliance to appliance. The OLED shows real‑time current, active power, total energy consumed since you pressed “reset,” and an estimated running cost based on your local electricity tariff. When your parents ask why the bill spiked, you’ll be able to point to the exact appliance and its hourly cost in rupees.

What You'll Learn

• How to interface an ACS712 hall‑effect current sensor with Arduino and read AC current
• Calculating RMS current, instantaneous power, and cumulative energy (watt‑hours) from raw sensor readings
• Driving a 0.96‑inch OLED to show multiple parameters on a single small screen
• Using tactile buttons to navigate between live cost, total watt‑hours, and reset functions

Kit Contents

Why Buy This Kit Instead of Sourcing Parts Separately

Who This Kit Is For

This kit is a natural fit for CBSE Class 11–12 students tackling a physics or computer science investigatory project that involves real‑world data logging. B.Tech ECE/EEE second‑year learners will love the sensor‑to‑display pipeline, while ATL Tinkering Lab mentors can use it to spark conversations about energy literacy. Smart India Hackathon teams prototyping smart‑home dashboards will also find it a fast, ready‑to‑deploy building block.

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.