Raspberry Pi Ds3231 Precision Rtc Module For Pico User Manual (+ PDF)

Contents hide

1 DS3231 Precision RTC Module for Pico

2 Precision RTC Module for Pico – Product Information

2.1 What’s on Board:

2.2 Pinout Definition:

2.3 Schematic:

3 Precision RTC Module for Pico – Product Usage Instructions

3.1 Raspberry Pi Code:

3.2 Python:

3.3 Windows:

3.4 Others:

3.5 Documents / Resources

3.5.1 References

DS3231 Precision RTC Module for Pico

Precision RTC Module for Pico – Product Information

The Precision RTC Module for Pico is a high precision real-time
clock module designed to be used with the Raspberry Pi Pico
microcontroller board. It incorporates the DS3231 high precision
RTC chip and supports I2C communication. The module also includes
an RTC backup battery slot that supports a CR1220 button cell for
maintaining accurate timekeeping even when the main power is
disconnected. The module features a power indicator that can be
enabled or disabled by soldering a 0 resistor on the jumper. It is
designed with a stackable header for easy attachment to the
Raspberry Pi Pico.

What’s on Board:

DS3231 high precision RTC chip
I2C bus for communication
RTC backup battery slot supporting CR1220 button cell
Power indicator (enabled by soldering a 0 resistor on the
jumper, disabled by default)
Raspberry Pi Pico header for easy attachment

Pinout Definition:

The pinout of the Precision RTC Module for Pico is as
follows:

Raspberry Pi Pico Code	Description
A	I2C0
B	I2C1
C	GP20
D	P_SDA
1	GP0
2	GP1
3	GND
4	GP2
5	GP3
6	GP4
7	GP5
8	GND
9	GP6
10	GP7
11	GP8
12	GP9
13	GND
14	GP10
15	GP11
16	GP12
17	GP13
18	GND
19	GP14
20	GP15

Schematic:

The schematic diagram of the Precision RTC Module for Pico can
be viewed by clicking here.

Precision RTC Module for Pico – Product Usage Instructions

Raspberry Pi Code:

Open a terminal of Raspberry Pi.
Download and unzip the demo codes to the directory Pico C/C++
SDK. Note that the directory of SDK may be different for different
users, so you need to check the actual directory. Generally, it
should be ~/pico/. Use the following command: wget -P ~/pico https://www.waveshare.com/w/upload/2/26/Pico-rtc-ds3231_code.zip
Navigate to the Pico C/C++ SDK directory: cd ~/pico
Unzip the downloaded code: unzip Pico-rtc-ds3231_code.zip
Hold the BOOTSEL button of Pico and connect the USB interface
of Pico to Raspberry Pi. Then release the button.

Compile and run the pico-rtc-ds3231 examples using the
following commands:

      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

Open a terminal and use minicom to check the sensor’s
information.

Python:

Refer to Raspberry Pi’s guides to set up Micropython firmware
for Pico.
Open the Thonny IDE.
Drag the demo code to the IDE and run it on Pico.
Click the run icon to execute the MicroPython demo codes.

Windows:

Instructions for using the Precision RTC Module for Pico with
Windows are not provided in the user manual. Please refer to the
product documentation or contact the manufacturer for further
assistance.

Others:

The LED lights on the module are not used by default. If you
need to use them, you can solder a 0R resistor on the R8 position.
You can view the schematic diagram for more details.

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Precision RTC Module for Pico Incorporates High Precision User Manual
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 0 resistor on the jumper, disabled by default 4- Raspberry Pi Pico header for attaching to Raspberry Pi Pico, stackable design

Pinout Definition:
Raspberry Pi Code:
1. Open a terminal of Raspberry Pi 2. Download and unzip the demo codes to directory Pico C/C++ 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://www.waveshare.com/w/upload/2/26/Pico-rtc-ds3231_code.zip cd ~/pico unzip Pico-rtc-ds3231_code.zip
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/p ico && sleep 2 && sudo minicom -b 115200 -o -D /dev/ttyACM0

3. Open a terminal and user minicom to check the sensor’s information.
Python:
1. Refer to Raspberry Pi’s guides to setup Micropython firmware for Pico 2. Open the Thonny IDE, and drag the demo to IDE and run on Pico as below.

3. Click the “run” icon to run the MicroPython demo codes.

Windows:
· Download and unzip the demo to your Windows desktop, refer to Raspberry Pi’s guides to set up the Windows software environment settings.
· Press and hold the BOOTSEL button of Pico, connect the USB of Pico to the PC with a MicroUSB cable. Import c or python program into Pico to make it run.
· Use the serial tool to view the virtual serial port of Pico’s USB enumeration to check the print information, the DTR needs to be opened, the baud rate is 115200, as shown in the picture below:
Others:
– The LED light are not used by default, if you need to use it, you can solder a 0R resistor on the R8 position. Click to view the schematic diagram.
– The INT pin of DS3231 is not used by default. if you need to use it, you can solder the 0R resistor on the R5,R6,R7 positions. Click to view the schematic diagram. o Solder the R5 resistor, connect the INT pin to the GP3 pin of Pico, to detect the output status of the DS3231 alarm clock. o Solder the R6 resistor, connect the INT pin to the 3V3_EN pin of Pico, to turn off the Pico power when the DS3231 alarm clock outputs low level. o Solder the R7 resistor, connect the INT pin to the RUN pin of the Pico, to reset Pico when DS3231 alarm clock outputs low level.

Schematic:
1 A
B
C
D 1

H2 Identification

I2C0 I2C1

GP20 P_SDA GP6

H3 H1
11 22 33

GP0 GP1 GND GP2 GP3 GP4 GP5 GND GP6 GP7 GP8 GP9 GND GP10 GP11 GP12 GP13 GND GP14 GP15

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

GPIO0

VBUS

GPIO1

VSYS

GND