GPS-Disciplined DS3231 Frequency Standard Kit
Build a GPS-Disciplined DS3231 Frequency Standard 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.
You are about to move beyond theory and build a laboratory-grade frequency reference on your own workbench. By harnessing the 1PPS signal from a NEO-6M GPS receiver, you will continuously discipline a DS3231 real-time clock, transforming it into a stable timebase that can measure oscillator drift down to parts per billion. This is the same principle used in national time standards, miniaturised into an Arduino-based system with real-time feedback on an OLED, ADC comparison circuitry, and data logging to MicroSD for long-term stability plots.
What You'll Build
You will assemble a complete GPS-disciplined oscillator that locks the DS3231's 32.768 kHz crystal to GPS atomic clocks. Once calibrated, the system provides a corrected 1 Hz output that can serve as a frequency standard. With the ADS1115 16-bit ADC, you can compare an external oscillator's frequency against this disciplined signal, measure phase differences, and log the results. A bright 0.96-inch OLED displays frequency offset, lock status, and stability metrics in real time.
What You'll Learn
- Interfacing a NEO-6M GPS module and extracting the 1PPS timing pulse with Arduino
- Implementing a PID-based phase-locked loop to correct the DS3231 RTC's frequency offset
- Using the ADS1115 ADC to capture phase-comparison data for oscillator stability measurements
- Logging time-stamped frequency measurements to a microSD card and plotting long-term drift
- Assembling a precision circuit on a prototype board with proper decoupling using 100 nF capacitors and pull-up resistors
Kit Contents
| Component | Quantity |
|---|---|
| Arduino Uno R3 | 1 |
| NEO-6M GPS | 1 |
| DS3231 RTC | 1 |
| ADS1115 ADC | 1 |
| MicroSD Module | 1 |
| 0.96in OLED | 1 |
| 4.7k? Resistors | 5 |
| 100nF Capacitors | 10 |
| 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
Ideal for B.Tech ECE/EEE students tackling advanced timing projects, participants of Smart India Hackathon working on precision instrumentation, and final-year engineering students building a GPS-disciplined frequency standard for their major project. Perfect for ATL Tinkering Lab mentors demonstrating high-accuracy timekeeping concepts and for hobbyists who want to understand how satellite-disciplined oscillators work at the circuit level.
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?
The AI companion walks you through each step; just scan the QR code. You can also reach us via WhatsApp for a direct guide response within hours.
Do I need an external frequency reference to compare oscillators?
No. The GPS-disciplined DS3231 provides the reference. You can connect an external oscillator to the ADC input and the system will measure its frequency offset relative to the GPS-locked timebase.
Can I use this kit to calibrate a 10 MHz reference oscillator?
Yes. The ADC-based comparison technique allows you to measure very small phase differences over time, giving you frequency accuracy directly traceable to GPS. A down-conversion circuit may be needed for high-frequency oscillators, but the measurement principle is fully supported.
Is the code open source and well-documented?
All firmware is provided as open-source Arduino sketches with inline comments. The documentation explains the PID loop, ADC averaging, and data logging format, so you can adapt it to your own timing projects.
Vehicle - GPS PPS signal disciplined DS3231 provides frequency standard for comparing oscillator stability.
What's in this kit
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