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User Manual for Raspberry Pi models including: DS3231 Precision RTC Module for Pico, DS3231, Precision RTC Module for Pico, Precision RTC Module, RTC Module, Module

Maha Chahab El Dine

Precision RTC Module for Pico Incorporates High Precision ...

27 giu 2022 — User Manual. What's on Board: ... Compile and run the pico-rtc-ds3231 examples ... Refer to Raspberry Pi's guides to setup Micropython firmware for Pico.


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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

2

3

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

U1

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

GND

GPIO2

3V3_EN

GPIO3

3V3

GPIO4 ADC_VREF

GPIO5 IO28/ADC2

GND

AGND

GPIO6 IO27/ADC1

GPIO7 IO26/ADC0

GPIO8

RUN

GPIO9

GPIO22

GND

GND

GPIO10 GPIO21

GPIO11 GPIO20

GPIO12 GPIO19

GPIO13 GPIO18

GND

GND

GPIO14 GPIO17

GPIO15 GPIO16

40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21

Pi pico (40P)

VBUS VSYS GND 3V3_EN 3V3(OUT) ADC_VREF GP28 GND GP27 GP26 RUN GP22 GND GP21 GP20 GP19 GP18 GND GP17 GP16

4

5

6

GP21 P_SCL GP7

3V3(OUT)

+3.3V

GP3 3V3_EN
RUN

R5

INT

0R/NC R6

0R/NC R7

0R/NC

A +3.3V +3.3V

R3

R4

+3.3V

U2

10K/NC 10K/NC

C6 0.1uF

R2 10K
INT

1 2 3 4 5 6 7 8

32KHz VCC INT/SQW RST NC NC NC NC

SCL SDA VBAT GND
NC NC NC NC

16 P_SCL 15 P_SDA 14 13 12 11 10 9

BAT1

B

GND

DS3231

GND

I2C Address: 0x68 C

Waveshare

+3.3V

R8

R1

GND

0R/NC

1K

L_PWR1

Pico-RTC-DS3231 D

2

3

4

5

6

References

Microsoft Word 2019