Milliohm Low Resistance Meter Kit with Arduino Uno + LED
Milliohm Resistance Meter Kit – Arduino Low Ohm Measurement
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
Ever needed to measure the resistance of a PCB trace or check a fuse but found your multimeter couldn’t give accurate readings below 1 ohm? This kit lets you build a precise Kelvin four-wire milliohm meter that resolves resistances down to a few milliohms, using a constant 1A current and a 16-bit ADS1115 ADC. Perfect for debugging power supply traces, testing motor windings, or evaluating cable losses.
What You'll Build
You’ll assemble a standalone, Arduino Uno-powered instrument with a clear OLED display that shows resistance in milliohms. The Kelvin clip arrangement eliminates lead resistance errors, giving you lab-grade accuracy in a portable, battery-operated package. Just connect the four crocodile clips to any low-resistance component and read the value instantly.
What You'll Learn
- How to implement the Kelvin four-wire measurement technique to overcome lead resistance.
- Reading and interpreting analog signals with a high-resolution ADC (ADS1115).
- Building a constant current source using a MOSFET and op-amp for precise excitation.
- Integrating an OLED display with Arduino for real-time data visualization.
Kit Contents
| Component | Quantity |
|---|---|
| Arduino Uno R3 | 1 |
| ADS1115 ADC | 1 |
| IRF540N MOSFET | 1 |
| 1Ω 1W Resistor | 2 |
| 0.96in OLED | 1 |
| 100Ω Gate Resistors | 3 |
| 10kΩ Resistors | 5 |
| Crocodile Clips | 4 |
| 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
This kit is ideal for CBSE Class 11-12 students exploring practical electronics in physics labs, B.Tech ECE/EEE students needing a low-cost precision measurement tool for projects, and ATL Tinkering Lab mentors guiding young innovators. It also suits hobbyists building test equipment for their home labs and participants of the Smart India Hackathon working on power electronics or embedded systems projects.
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 to access the AI companion, which can answer questions specific to this milliohm meter circuit. If you need human support, our WhatsApp helpline is also available during business hours.
Can I use this meter to measure internal resistance of batteries?
Yes, with caution. The constant 1A current may be too high for small cells. Measure for a very short duration or use a lower current if you modify the source resistor. The Kelvin method gives reliable internal resistance readings for most cylindrical and pouch cells.
How accurate is the milliohm measurement compared to a commercial meter?
The 16-bit ADS1115 ADC and Karlsson four-wire technique deliver accuracy within a few milliohms. Regular calibration with a known shunt resistor can tighten it further; the AI companion includes a calibration routine you can run anytime.
Can I adapt the circuit for higher resistance ranges?
Absolutely. Changing the 1Ω sense resistor to a 10Ω value alters the constant current, letting you measure up to a few hundred milliohms. The AI companion will guide you through the modifications and code adjustments needed.
Kelvin four-wire measurement of milliohm-range resistances. ADS1115 precision ADC and 1A constant current.
What's in this kit
- Arduino Uno R3
- ADS1115 ADC
- IRF540N MOSFET
- 1Ω 1W Resistor x2
- 0.96in OLED
- 100Ω Gate Resistors x3
- 10kΩ Resistors x5
- Crocodile Clips x4
- 400-pt Breadboard
- M-M Wires x20
- 9V Battery Snap
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