LED Tester and Current Limiter Kit with Arduino Uno
Build Your Own Precision LED Tester and Current Limiter 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.
Stop guessing whether your LEDs are working or risk burning them out. This kit lets you build a dedicated test instrument that dials in any current from 1mA to 30mA with a knob, displays the actual current flowing through the LED via the ACS712 sensor, and shows the LED's forward voltage (Vf) on a bright 16x2 LCD. Once built, it becomes a permanent bench tool for sorting, testing, and matching LEDs in any maker’s lab.
What You'll Build
You’ll assemble a self-contained LED characterisation station: an Arduino Uno reads the ACS712 current sensor and drives a standard 16x2 LCD through an I2C backpack. A potentiometer lets you set a precise current limit, and the IRF540N MOSFET regulates current without flicker. Plug in an LED, turn the knob, and instantly know its Vf and the exact milliamps it’s drawing — no multimeter needed. It’s your personal LED sorting jig.
What You'll Learn
- How to use a potentiometer as an adjustable control for current limiting
- Reading current values from an ACS712 Hall-effect sensor and displaying them on an LCD
- Measuring forward voltage of LEDs and understanding Vf variation across colours and types
- MOSFET-based constant current control — a practical analog circuit used in power electronics
Kit Contents
| Component | Quantity |
|---|---|
| Arduino Uno R3 | 1 |
| ACS712 5A | 1 |
| IRF540N MOSFET | 1 |
| 16x2 LCD | 1 |
| I2C Backpack | 1 |
| 10kΩ Potentiometer | 1 |
| 100Ω Gate Resistors | 3 |
| 400-pt Breadboard | 1 |
| M-M 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
Perfect for CBSE Class 11–12 students exploring practical physics and electronics, B.Tech ECE/EEE freshers building their first measurement tools, and ATL tinkering lab facilitators who need a reusable demo instrument. The 5–15 age range makes it an ideal parent-child STEM project; everything runs off a 9V battery, so it’s safe and portable. Makers from IITs, NITs, and VIT will find it a handy bench companion for testing salvaged or bulk LEDs.
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?
Scan the QR code inside the box to start a conversation with the AI build companion. It understands every wire and code line for this specific kit. If you need a human, message us on WhatsApp — we reply within a few hours.
Can this tester handle high-power LEDs like 1W or 3W?
The default current range is 1–30mA, designed for standard 3mm and 5mm indicator LEDs. You can modify the circuit for higher currents, but the kit components are optimised for safe learning and everyday lab use.
How do I connect the LED to be tested?
The breadboard includes marked test points. Just insert the LED into the dedicated socket strips — the polarity is clearly labelled through the build guide. No soldering required.
Does this kit need a computer for programming?
Yes, you'll need a computer with the Arduino IDE (free) to upload the provided code. The AI companion walks you through installation and upload in under 10 minutes.
Potentiometer sets test current from 1mA to 30mA. ACS712 measures actual LED current. LCD shows Vf.
What's in this kit
- Arduino Uno R3
- ACS712 5A
- IRF540N MOSFET
- 16x2 LCD
- I2C Backpack
- 10kΩ Potentiometer
- 100Ω Gate Resistors x3
- 400-pt Breadboard
- M-M Wires x20
- 9V Battery Snap
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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