Kelvin Resistance Bridge Kit with Arduino Uno + LED
Kelvin Resistance Bridge Kit with Arduino Uno – Milliohm Measurement for Contact Resistance Testing
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
Connectors degrade, relay contacts wear, and battery terminals oxidize — all causing higher resistance that standard multimeters can't reliably detect. With this kit, you build a dedicated four-wire Kelvin bridge that uses the ADS1115 16‑bit ADC to resolve milliohm‑level changes, revealing the true health of electrical contacts. It's the same principle used in industrial quality testers, now on your workbench in 4 to 5 hours.
What You'll Build
A benchtop‑grade milliohm meter capable of measuring resistances as low as 0.1 mΩ with better than 0.5 % repeatability. The system reads the voltage drop across your unknown resistance and a 0.1 % precision reference resistor simultaneously, all driven by an LM334‑based constant current source. The calibrated result appears in real time on a 0.96‑inch OLED display, ready for you to evaluate contact resistance of battery points, PCB traces, switch terminals, and more.
What You'll Learn
- Implement the four‑wire Kelvin measurement technique to cancel lead‑resistance errors completely.
- Interface a high‑resolution ADS1115 16‑bit ADC with Arduino Uno over I2C for microvolt‑level readings.
- Design and calibrate a stable constant current source using the LM334 current regulator.
- Display real‑time resistance values and debug information on an OLED using Arduino libraries.
Kit Contents
| Component | Quantity |
|---|---|
| Arduino Uno R3 | 1 |
| ADS1115 ADC | 1 |
| LM334 Current Source | 1 |
| 0.96in OLED | 1 |
| 1Ω 0.1% Reference | 1 |
| 100nF Caps | 5 |
| Kelvin Probe Clips | 4 |
| PCB Prototype Board | 2 |
| 9V Battery Snap | 1 |
| Soldering Iron | 1 |
| Solder Wire | 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 building precision instruments for Smart India Hackathon or semester projects will find the Kelvin bridge an essential tool for characterizing contact materials. CBSE Class 11–12 learners exploring practical resistance measurement can turn a textbook concept into a real working device. ATL Tinkering Lab mentors and IIT/NIT/VIT/BITS project labs looking for reliable, documented hardware get a ready‑to‑build package that teaches both analog circuit design and microcontroller interfacing.
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 chat with our AI companion trained specifically for this kit. It recognises common wiring mistakes and calibration errors. If you need human help, drop us a WhatsApp message — we reply within a few hours.
Can this kit measure battery internal resistance?
Yes, the four‑wire Kelvin probes can be used to measure the AC or DC internal resistance of batteries. Just ensure the battery is disconnected from any load, and follow the calibration steps provided. The AI companion will guide you through a safe measurement procedure.
Do I need prior soldering experience?
Basic soldering skills are helpful but not mandatory. The kit includes a soldering iron and solder, and the AI companion gives video‑like pictorial guidance for all joints on the prototyping boards. Expect to level up your soldering confidence by project’s end.
What accuracy can I realistically expect?
With careful assembly and proper calibration against the included 0.1 % reference resistor, you can achieve absolute accuracy better than 1 % in the 1 mΩ to 1 Ω range. The AI companion displays live error tracking during calibration so you know exactly how precise your unit is.
Four-wire Kelvin method with ADS1115 measures milliohm resistances accurately for contact resistance testing.
What's in this kit
- Arduino Uno R3
- ADS1115 ADC
- LM334 Current Source
- 0.96in OLED
- 1Ω 0.1% Reference
- 100nF Caps x5
- Kelvin Probe Clips x4
- PCB Prototype Board x2
- 9V Battery Snap
- Soldering Iron
- Solder Wire
Choose your assembly option:
- Soldering Kit — 25W soldering iron, 60/40 solder wire, flux, and small perfboard for permanent assembly.
- Breadboard Combo — 800-point full-size breadboard with 65-piece jumper wire pack for solderless prototyping.
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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