DIYables DS3231 RTC Real Time Clock Module
Click to zoom
Quick Overview
This DIYables DS3231 real time clock module set includes two high-precision RTC modules with I2C interface for accurate timekeeping in microcontroller projects. The DS3231 features a temperature-compensated crystal oscillator (TCXO) that maintains accuracy of ±2 ppm (approximately ±1 minute per year).
Each module connects via I2C (SCL, SDA) and operates on 3.3V to 5.5V, making it compatible with most microcontrollers. The onboard CR2032 battery holder (battery not included) maintains time even when main power is disconnected, perfect for data loggers, clocks, and alarm systems.
The DS3231 provides seconds, minutes, hours, day, date, month, and year information with automatic leap year compensation. Compatible with Arduino, ESP32, ESP8266, Raspberry Pi, and popular RTC libraries for easy integration.
Key Features
- Two RTC Modules Included — Complete set with 2 high-precision DS3231 modules
- High Precision Timekeeping — TCXO accuracy of ±2 ppm (±1 minute per year)
- I2C Interface — Simple 4-wire connection (VCC, GND, SCL, SDA)
- Battery Backup — CR2032 holder maintains time when power is disconnected
- Wide Voltage Range — Operates on 3.3V to 5.5V for broad compatibility
- Complete Date/Time — Tracks seconds, minutes, hours, day, date, month, year
- Automatic Leap Year — Built-in leap year compensation through 2100
- Temperature Compensation — TCXO maintains accuracy across temperature changes
- Low Power Consumption — Efficient operation suitable for battery-powered projects
- Versatile Applications — Digital clocks, data loggers, alarm systems, and automation
SPECIFICATION
| Specification | Value |
|---|---|
| Product Type | Real Time Clock Module |
| Quantity | 2 modules |
| RTC Chip | DS3231 |
| Accuracy | ±2 ppm (±1 minute per year) |
| Oscillator | Temperature-compensated crystal (TCXO) |
| Interface | I2C (SCL, SDA) |
| I2C Address | 0x68 (default) |
| Operating Voltage | 3.3V to 5.5V DC |
| Backup Battery | CR2032 (not included) |
| Timekeeping | Seconds, minutes, hours, day, date, month, year |
| Leap Year Compensation | Automatic (valid through 2100) |
| Alarm Functions | Two programmable alarms |
| Square Wave Output | 1Hz to 32kHz (configurable) |
| Temperature Sensor | Built-in (±3°C accuracy) |
Tutorials
COMPATIBLE HARDWARE
- Arduino boards (UNO, Mega, Nano, etc.) — I2C pins required
- ESP32 development boards — I2C support
- ESP8266 boards (NodeMCU, Wemos D1, etc.) — I2C pins
- Raspberry Pi (all models) — I2C interface
- Raspberry Pi Pico — I2C capability
- Any 3.3V or 5V microcontroller with I2C support