DS3231 RTC (Real Time Clock) Module 3.3V 5V Precise with Battery

DS3231 RTC Module – High-Precision Real-Time Clock for 3.3V and 5V Systems

Keep your projects running on time — always. The DS3231 RTC Module is a compact, ultra-accurate real-time clock designed for makers, developers, and engineers who need reliable timekeeping in their electronics. Whether you’re building with Raspberry Pi, Arduino, or any other microcontroller, this module makes integration effortless thanks to its intelligent design and voltage flexibility.

Unlike many RTC modules that only support 5V logic, this module smartly accommodates both 3.3V and 5V systems, making it a seamless fit for the Raspberry Pi without the need for level shifters or converters.

Despite its small size (just 14x14x12 mm), the DS3231 punches above its weight — offering clock functionality accurate to within ±5ppm and reliable up to the year 2100. Plus, it features two programmable calendar alarms, a 1Hz square wave output, and a 32.768kHz output for crystal-clear timing signals. The onboard battery backup ensures your timekeeping doesn’t miss a beat, even during power outages.

Why You’ll Love It:

• Plug-and-Play with Raspberry Pi & Arduino – No need for extra voltage converters.
• Battery-Backed Accuracy – Keeps time even when your project is off.
• Minimal Footprint, Maximum Function – Fits tight spaces while packing a full calendar and alarm set.
• Rock-Solid Timing – ±0.432 seconds of drift per day.

Key Features:

• Full calendar support: seconds, minutes, hours, day, date, month, and year
• Battery backup for uninterrupted timekeeping
• Two programmable alarms for custom alerts
• I2C interface (400kHz) for fast, stable communication
• Outputs: 1Hz and 32.768kHz signals
• Auto-adjusts for 3.3V and 5V operation
• Temperature range: -40°C to +85°C

Specifications:

• Supported Raspberry Pi and Arduino Within -40C to +85 C temperature range
• Timing accuracy is maintained at 5ppm ( 0.432 sec/day).
• operating temperature range:-40C to +85C
• Provide battery backup for continuous timing.
• Complete clock functions include seconds, minutes, hours, day, date, month and year timing, and provide valid to 2100.
• Two calendar alarm.
• 1Hz and 32.768kHz output.
• Dimension : 14x14x12 mm

Ideal For:

• DIY electronics and automation
• Battery-operated and portable devices
• Outdoor or industrial applications
• Data logging and long-term time tracking
• Custom clocks and alarm systems

What’s in the Box:

• 1 × DS3231 RTC Module (3.3V/5V compatible)