- 1 Features
- 2 Specification
- 3 Pinout
- 4 Digital tube and controller
- 5 Timing
- 6 Hardware connection
- 7 Setup environment
- 8 Download example
- 9 Raspberry Pi
- 10 Windows
- 11 Codes Description
- 12 Document
- 13 Demo codes
- SPI-compatible, easy to drive
- Onboard high precision RTC chip DS3231, with backup battery holder
- Standard Raspberry Pi Pico header, supports Raspberry Pi Pico series
- Operating voltage: 5V
- Digits: 4
- Display size:0.4inch
- LED color: red
- Driver: 74HC595
- Display part No.: FJ4401AH
- Dimensions: 52 x 21mm
Digital tube and controller
74HC595 is a high-speed CMOS 8-bit 3-state shift register/output latch chip, using CMOS silicon gate technology. The device contains an 8-bit serial input and parallel output shift register and provides an 8-bit D-type storage register with an 8-bit 3-state output. Provide independent clock signals to the shift register and storage register. The shift register has a direct clearing function, serial input and output functions, and cascade applications. (Using standard pins.) Both shift registers and storage registers use a positive Edge clock trigger, if these two clocks are connected together, the shift register is always the previous clock pulse of the storage register. All input ports are equipped with anti-static and instant overvoltage protection circuits
LED color: red
Circuit connection type: Negative
Display size: 0.4inch
Please take care of the direction when you connect Pico, an USB port is printed to indicate . You can also check the pin of Pico and the LCD board when connecting.
You can connect display according to the table.
|DIN||GP11||Serial data input|
|CLK||GP10||Data input clock pin|
|RCLK||GP9||Output latch register clock pin|
Please refer to Raspberry Pi's guide: https://www.raspberrypi.org/documentation/pico/getting-started/
1. Open a terminal of Raspberry Pi
sudo apt-get install p7zip-full cd ~ sudo wget https://www.waveshare.net/w/upload/2/28/Pico_code.7z 7z x Pico_code.7z -o./Pico_code cd ~/Pico_code cd c/build/
- Open a terminal and got to the C directory
- Create build folder and add path of SDK to it, it is ../../pico-sdk by default, however, it may be different for different users, please check the actual path of your pico.
cd build export PICO_SDK_PATH=../../pico-sdk
- run cmake to generate Makefile, and build it.
cmake .. make -j9
- A main.uf2 file is generated.
- Hold the BOOTSEL button of Pico, and connect the USB interface of Pico to Raspberry Pi then release the button.
- Copy the main.uf2 file to the RPi-RPI2 drive recognized.
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.
3. Click File -> Open... and choose the Pico-8SEG-LED.py file to run
- Download and unzip the demo codes 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.
In DEV_Config.c(.h) file (...\c\lib\Config)
- Data type：
#define UBYTE uint8_t #define UWORD uint16_t #define UDOUBLE uint32_t
- Mpdule initialize and exit:
void DEV_Module_Init(void); void DEV_Module_Exit(void); Note： 1.These are functions which are used for handle GPIO:
- GPIO Write/read：
void DEV_Digital_Write(UWORD Pin, UBYTE Value); UBYTE DEV_Digital_Read(UWORD Pin);
- SPI write byte
void DEV_SPI_WriteByte(UBYTE Value);