This is a high-precision RTC expansion module specifically designed for the Raspberry Pi Pico. The module incorporates a high-precision DS3231 RTC chip and uses the I2C bus for communication. The stackable design allows you to add other hardware whilst using the RTC board. Note: Raspberry Pi Pico not included. You'll need a Pico with male headers soldered to it. You can grab a Pico here and Pico male headers here, or buy a Pico with pre-soldered headers. Features * Standard Raspberry Pi Pico header, supports Raspberry Pi Pico series * Onboard high precision RTC chip DS3231, with backup battery holder * Real-Time Clock Counts Seconds, Minutes, Hours, Date of the Month, Month, Day of the Week, and Year with Leap-Year Compensation Valid Up to 2100 * Optional format: 24-hour OR 12-hour with an AM/PM indicator * 2x programable alarm clock * Online development resources and manual (Raspberry Pi Pico C/C++ and MicroPython examples) * Dimensions: 52mm x 21mm Note: Raspberry Pi Pico and CR1220 battery not included What's On Board * 1) DS3231 * High-precision RTC chip, I2C bus * 2) RTC backup battery * Supports CR1220 button cell * 3) Power indicator * Enabled by soldering a 0Ω resistor on the jumper, disabled by default * 4) Raspberry Pi Pico header * For attaching to Raspberry Pi Pico, stackable design Resources * Product Wiki Package Contents * 1x Pico RTC Module Raspberry Pi Pico and CR1220 battery not included Pinout Specifications Operating Voltage 3.3V Battery Backup Voltage 2.3V ~ 5.5V Operating Temperature -40°C ~ +85°C Power Consumption 100nA (sustains data and clock information) https://elecena.pl/product/22721791/precision-rtc-module-for-raspberry-pi-pico-ds3231 2023-03-07 https://elecena.pl/product/22721791/precision-rtc-module-for-raspberry-pi-pico-ds3231 2023-12-27 https://elecena.pl/product/22721791/precision-rtc-module-for-raspberry-pi-pico-ds3231 2024-09-19 https://elecena.pl/product/22721791/precision-rtc-module-for-raspberry-pi-pico-ds3231 2024-11-29 https://elecena.pl/product/22721791/precision-rtc-module-for-raspberry-pi-pico-ds3231 2024-11-30 https://elecena.pl/product/22721791/precision-rtc-module-for-raspberry-pi-pico-ds3231 2025-08-05 https://elecena.pl/product/22721791/precision-rtc-module-for-raspberry-pi-pico-ds3231 2025-11-28 https://elecena.pl/product/22721791/precision-rtc-module-for-raspberry-pi-pico-ds3231 2025-11-29