PICO RTC DS3231 User manual

Pico RTC DS3231
(https://www.waveshare.com/pico-
rtc-ds3231.htm)
Precision RTC Module for Raspberry Pi
Pico, Onboard DS3231 Chip
Pico RTC DS3231
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Overview
The Pico-RTC-DS3231 is an RTC expansion module
specialized for Raspberry Pi Pico. It incorporates high
precision RTC chip DS3231 and uses an I2C bus for
communication. More external sensors are allowed to be
connected thanks to the stackable design.
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.
2 x programable alarm clock.
Provide online documentation (Raspberry Pi Pico C/C++ and MicroPython example
demos).
Specification
Operating voltage: 3.3V
Backup battery voltage: 2.3V~5.5V
Operating temperature: -40°C ~ 85°C

Power consumption: 100nA (sustains data and clock information)
Pinout

(/wiki/File:Pico-RTC-DS3231-details-inter.jpg)
Dimensions
(/wiki/File:Pico-RTC-DS3231-details-dimension.jpg)
User Guide
Setup environment
1. For an application development environment for Pico on Raspberry Pi, please refer to

the Raspberry Pi Chapter (https://datasheets.raspberrypi.com/pico/getting-started-with
-pico.pdf).
2. For the Windows environment setting, you can refer to link (https://files.waveshare.com/
upload/6/65/Getting-started-with-pico.pdf).
This tutorial uses the VScode IDE for development in a Windows environment.
Raspberry Pi
1. Log in Raspberry Pi With SSH (https://www.waveshare.com/wiki/Log_in_Raspberry_Pi_ter
minal_by_SSH) or press Ctrl+Alt+T at the same time while using the screen to open the
terminal.
2. Download and unzip the demo codes to the directory Pico C/C++ SDK. Reference
tutorial (https://www.waveshare.com/wiki/Raspberry_Pi_Pico) for users who have not yet
installed the SDK.

#Note that the directory of SDK may be different for different users, you need to check
the actual directory. Generally, it should be ~/pico/.
wget -P ~/pico https://files.waveshare.com/upload/2/26/Pico-rtc-ds3231_code.zip
cd ~/pico
unzip Pico-rtc-ds3231_code.zip
c
1. Hold the BOOTSEL button of Pico, and connect the USB interface of Pico to Raspberry Pi
then release the button.
2. Compile and run the pico-rtc-ds3231 examples:
cd ~/pico/pico-rtc-ds3231_code/c/build/
cmake ..
make
sudo mount /dev/sda1 /mnt/pico && sudo cp rtc.uf2 /mnt/pico/ && sudo sync && sudo umount
/mnt/pico && sleep 2 && sudo minicom -b 115200 -o -D /dev/ttyACM0

3. Open a terminal and use minicom to check the sensor's information.
(/wiki/File:Pico-RTC-DS3231004.jpg)
python
1. Refer to Raspberry Pi's guides to setup Micropython firmware for Pico.
2. Open the Thonny IDE, drag the demo to IDE, and run on Pico as below.

(/wiki/File:Pico-10DOF-IMU005.jpg)

(/wiki/File:Pico-RTC-DS3231005.jpg)
3. Click the "run" icon to run the MicroPython demo codes.

(/wiki/File:Pico-RTC-DS3231006.jpg)