# RTC module Waveshare DS3231 I2C real-time clock for Raspberry Pi Pico

**URL:** https://aio.lv/en/product--waveshare-wsr-18989--11980603
**Data updated:** 2026-03-11 16:31 (EET)
**Category:** Server Parts & Components
**Manufacturer:** Waveshare
**Manufacturer code:** WSR-18989
**EAN:** 5904422371586
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 15.49 €
**Prices and availability valid until:** 2026-07-12 23:59
**Price without VAT (21%):** 12.80 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--waveshare-wsr-18989--11980603

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 03.07.2026 | free |
| Pickup points | 08.07.2026 | 1.99 EUR |
| Courier delivery to door | 08.07.2026 | 4.99 EUR |

## Summary description

Waveshare DS3231 RTC module is a real-time clock board with I2C interface designed for use with Raspberry Pi Pico. It provides accurate timekeeping using the DS3231 chip, supports battery backup for maintaining time when power is off, and connects via I2C for easy integration in embedded projects, data logging, and scheduling applications.

## Long description

The Waveshare DS3231 I2C real-time clock module for Raspberry Pi Pico is a compact board that provides accurate timekeeping for embedded projects. It integrates the DS3231 high-precision RTC chip and communicates over the I2C bus, allowing easy connection to Raspberry Pi Pico and other microcontrollers that support I2C. The module includes a battery backup input to maintain time and date information when primary power is removed, making it suitable for data logging, scheduled tasks, and systems that require persistent clock information.
Advantages
The module delivers high-accuracy timekeeping thanks to the DS3231 chip with integrated temperature-compensated crystal oscillator. Its I2C interface simplifies wiring and software integration with Raspberry Pi Pico and common microcontroller platforms. The small form factor and standard pinout enable straightforward mounting on development boards or custom prototypes. Battery backup capability ensures uninterrupted time tracking during power outages, and low power consumption makes it suitable for battery-powered applications.
Suitable for
Real-time clock for Raspberry Pi Pico projects
Data logging with timestamped sensor readings
Scheduled events and automation tasks
Clock backup in systems with intermittent power
Educational and prototyping applications
Key specifications
RTC chip: DS3231 with temperature-compensated crystal oscillator for high accuracy
Interface: I2C for communication with Raspberry Pi Pico and other microcontrollers
Backup: Battery backup input to maintain time and date during power loss
Form factor: Compact module suitable for breadboard or header connection
Power: Low power consumption optimized for long-term use in embedded systems
How to use
Connect the module to the Raspberry Pi Pico using the I2C SDA and SCL lines, along with power (VCC) and ground (GND). Install or enable an appropriate DS3231 driver or library in your development environment, then initialize the I2C bus and configure the RTC time and date as required. Insert a compatible backup battery into the module's battery holder to preserve the clock when external power is removed. After initial setup, read and write time registers via I2C to retrieve timestamps or set alarms and square-wave outputs if supported by your software.
Usage recommendations
Use stable power supply lines and proper pull-up resistors on I2C if not provided by your host board. Keep the backup battery installed for reliable time retention, and periodically verify RTC accuracy against a reference clock. When using in battery-powered projects, minimize unnecessary polling and use interrupt or alarm features to conserve energy.

## FAQ

### How much does the Waveshare DS3231 RTC module for Raspberry Pi Pico cost, and is it available for purchase?

The price is 15.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 23 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 03.07.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay. All transactions are 100% secure and encrypted.

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All Waveshare products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized Waveshare service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

## Image

https://aio.lv/img/cache/product/11980603/67432365_large.webp