Power Factor Meter Kit with Arduino Uno + LED
Power Factor Meter Kit – Measure True AC Power 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.
Turn an Arduino Uno into a true power factor meter that simultaneously samples AC voltage and current, detects the phase shift between them, and displays real-time results on a crisp OLED. Whether you’re exploring energy concepts for a school project, validating load characteristics for an engineering lab, or building a portable energy audit tool, this kit gives you the exact hardware and guidance to go from unpacking to meaningful measurements in a single afternoon.
What You'll Build
You’ll assemble a compact, self-contained instrument. The ZMPT101B transformer isolates and steps down mains-level AC voltage, while the ACS712 Hall-effect sensor captures current draw. The Arduino samples both channels simultaneously, runs a zero-crossing detection algorithm, and computes the phase angle to derive true power factor. Output — power factor, RMS voltage, RMS current, and apparent power — appears instantly on the included 0.96-inch OLED. The breadboard layout keeps everything accessible, so you can easily modify the circuit or add data logging later.
What You'll Learn
- Sample two analog signals simultaneously and handle AC waveforms in code
- Implement zero-crossing detection to measure phase difference between voltage and current
- Display sensor data, calculated values, and status on an I2C OLED screen
- Calibrate the ZMPT101B and ACS712 for accurate, repeatable readings
Kit Contents
| Component | Quantity |
|---|---|
| Arduino Uno R3 | 1 |
| ZMPT101B AC Voltage Sensor | 1 |
| ACS712 20A Current Sensor | 1 |
| 0.96in OLED Display | 1 |
| 10kΩ Resistor | 5 |
| 100nF Capacitor | 5 |
| 400-pt Breadboard | 1 |
| M-M Jumper Wires | 20 |
| 9V Battery Snap | 1 |
Why Buy This Kit Instead of Sourcing Parts Separately
| Factor | Sourcing Separately | Compoden Kit |
|---|---|---|
| Compatibility checks | You verify every part | Pre-tested as a system |
| Build support | Forums and scattered tutorials | AI companion trained on this exact project |
| Time to first working build | Days of debugging | Hours, with step-by-step guidance |
| Shipping coordination | Multiple sellers, multiple delays | One shipment from Bengaluru in 3-5 days |
Who This Kit Is For
B.Tech ECE and EEE students who need a hands-on power factor measurement setup for lab work. CBSE Class 12 physics learners building investigatory projects on AC circuits. ATL Tinkering Lab mentors demonstrating reactive power concepts. Smart India Hackathon teams prototyping energy monitoring solutions. The kit assumes no prior AC electronics experience — the guided build walks you through every connection and line of code.
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.
What if I get stuck during the build?
Open the AI companion via the QR code or send a WhatsApp message to our support team. We’ll guide you step by step, from wiring checks to code verification.
Can I measure the power factor of household appliances?
The ZMPT101B can safely handle up to 250V AC in a controlled environment. For first builds, we recommend starting with a low‑power AC adapter (e.g., 12V) and a small load like a table fan. Always follow the safety notes included in the build guide.
Does the kit include an AC power source?
No, the kit does not include an AC source or load. You’ll need a 5–12V AC adapter or a step‑down transformer to provide a safe test signal. The breadboard circuit and sensors are ready for that input.
Will this work with a 3‑phase supply?
This kit measures single‑phase power factor only. For three‑phase measurements, you would need two additional ZMPT101B/ACS712 pairs and modify the code, but the core phase‑detection principle you learn here directly applies.
ZMPT101B voltage and ACS712 current sampled simultaneously. Phase difference calculates power factor.
What's in this kit
Other projects you can build
Shipping Information
- Prepaid Orders: ₹75 for orders up to ₹999, FREE shipping above ₹999
- COD Orders: ₹125 shipping + ₹50 COD fee = ₹175 total
- Delivery Timeline: Dispatch in 1-2 days, delivery in 2-7 days depending on location
Returns & Warranty
- 7-Day Return: Manufacturing defects only (approval required)
- Warranty: 7 days from delivery
- Non-Returnable: Batteries, consumables, cut wires, clearance items