Calibrated Weigh Scale Kit with Arduino Uno + LED
Calibrated Weigh Scale Kit with Arduino Uno + LED – Build a 0.1g Precision Lab Balance
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 your workbench into a metrology station with a fully functional digital balance capable of resolving 0.1 grams. This project merges a traceably calibrated 5 kg load cell with an HX711 amplifier and a crisp OLED display, giving you a tool that rivals entry-level lab scales. Whether you need to weigh electronic components, measure ingredients for chemistry experiments, or simply satisfy a curiosity for precision instrumentation, this kit delivers reproducible results you can trust.
What You'll Build
You will assemble, wire, and program a complete weighing system housed on a prototype PCB. The scale reads in grams with one-decimal resolution, shows live values on the OLED, and responds to three tactile buttons for tare, calibration offset, and unit reset. The load cell has been pre-calibrated against traceable standard weights, so your first reading after soldering is already within tolerance — no guesswork, no hours lost to scaling factor trial-and-error.
What You'll Learn
- Interfacing a Wheatstone bridge sensor with the HX711 24-bit ADC and understanding noise-free bit counts
- Writing Arduino code that handles zero-offset, linear calibration, and digital filtering for stable weight output
- Building a user interface with an I2C OLED display and debounced tactile buttons for real-time control
- Hand-soldering through-hole components on prototyping board with proper flux technique and joint inspection
Kit Contents
| Component | Quantity |
|---|---|
| Arduino Uno R3 | 1 |
| HX711 + 5kg Load Cell | 1 |
| 0.96in OLED | 1 |
| Tactile Button | 3 |
| 10kΩ Resistors | 5 |
| 100nF Caps | 5 |
| 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
CBSE Class 11-12 students building physics investigatory projects on Hooke’s law or strain gauge characteristics will find a ready-to-validate experimental setup. B.Tech ECE and EEE undergraduates can directly integrate the scale into instrumentation and IoT coursework. ATL Tinkering Labs and Smart India Hackathon teams get a plug-and-play sensor module that accelerates prototyping for weighing-based automation concepts. Faculties at IIT, NIT, VIT, and BITS Pilani have used similar kits for lab demonstrations of sensor linearity and ADC resolution.
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 connect with the AI build companion that can answer wiring questions, spot code errors, or suggest calibration tweaks instantly. If you need a human touch, WhatsApp backup support from our Bengaluru team responds within a few hours.
Is the load cell already calibrated, or do I need external weights?
The load cell ships with a factory calibration certificate and a known conversion factor. You can start weighing immediately after assembly; for an absolute accuracy check, you can use any household item of known weight (like a sealed 500 g packet of salt) to verify and fine-tune the offset.
Can this scale be powered by a USB power bank instead of a 9V battery?
Yes. The Arduino Uno can be powered via its USB port, so a standard power bank works perfectly for portable operation. The 9V battery snap is provided as a low-noise, standalone option that avoids ground loops during sensitive measurements.
Does the kit include a casing or enclosure for the final scale?
The kit focuses on the electromechanical core; it does not include an enclosure. However, the two prototyping boards allow you to build a stable base and mounting frame. Many users craft enclosures from acrylic or 3D-printed parts, and the olive-friendly PCB layout makes that easy.
HX711 + 5kg load cell calibrated against traceable weights. OLED shows reading in grams to 0.1g resolution.
What's in this kit
- Arduino Uno R3
- HX711 + 5kg Load Cell
- 0.96in OLED
- Tactile Button x3
- 10kΩ Resistors x5
- 100nF Caps x5
- 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