Pico-8SEG-LED

4-Digit 8-Segment Display Module For Raspberry Pi Pico, SPI-Compatible

Features

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.

Specification

Operating voltage: 5V
Working current: 30mA
Digits: 4
Display size: 0.4inch
LED color: red
Driver: 74HC595
Display part No.: FJ4401AH
Dimensions: 21（H）x 52.00（V） mm

Pinout

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.
Digits：4
LED color: red
Circuit connection type: Negative
Display size: 0.4inch

Timing

Pico User Guide

Hardware connection

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.

LCD	Pico	Description
VCC	VSYS	Power input
GND	GND	GND
DIN	GP11	Serial data input
CLK	GP10	Data input clock pin
RCLK	GP9	Output latch register clock pin

Connection

Setup environment

Please refer to Raspberry Pi's guide: https://www.raspberrypi.org/documentation/pico/getting-started/

Download example

1. Open a terminal of Raspberry Pi

sudo apt-get install p7zip-full
cd ~
sudo wget  https://files.waveshare.com/upload/2/28/Pico_code.7z
7z x Pico-8SEG-LED-Code.7z -o./Pico-8SEG-LED-Code
cd ~/Pico-8SEG-LED-Code
cd c/build/

Raspberry Pi

Open a terminal and go to the C directory:

cd ~/Pico-8SEG-LED-Code/c/

Create a build folder and add the 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.

Python codes

Use in Windows

1. Press and hold the BOOTSET button on the Pico board, connect the Pico to the USB port of the computer through the Micro USB cable, and release the button after the computer recognizes a removable hard disk (RPI-RP2).
2. Copy the rp2-pico-20210418-v1.15.uf2 file in the python directory to the recognized removable disk (RPI-RP2).
3. Open Thonny IDE (Note: Use the latest version of Thonny, otherwise there is no Pico support package, the latest version under Windows is v3.3.3).
4. Click Tools -> Settings -> Interpreter, and select Pico and the corresponding port as shown in the figure.

5. File -> Open -> the corresponding .py file, click to run, as shown in the following figure:

This demo provides a simple program...

Run in Raspberry Pi

1. The process of firmware flashing is the same as on Windows, you can choose to copy the pico_micropython_20210121.uf2 file into pico on a PC or Raspberry Pi.
2. Open the Thonny IDE on the Raspberry Pi (click Raspberry logo -> Programming -> Thonny Python IDE), you can check the version information in Help -> About Thonny.
To make sure your version has the Pico support package, also you can click on Tools -> Options... -> Interpreter to select MicroPico. -> Interpreter to select MicroPython (Raspberry Pi Pico and ttyACM0 port).

As shown in the image:

If your Thonny doesn't support Pico, you can update it with the following command:

sudo apt upgrade thonny

Choose File -> Open...-> python/Pico-8SEG-LED/Pico-8SEG-LED.py, and select the corresponding .py file to run the codes.

Codes Description

C

Buttom interface

In DEV_Config.c(.h) file (...\c\lib\Config)

Data type：

#define UBYTE   uint8_t
#define UWORD   uint16_t
#define UDOUBLE uint32_t

Mpdule initializes and exit:

void DEV_Module_Init(void);
void DEV_Module_Exit(void);
Note：
1. These are functions that are used to 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);

Resource

Document

Demo codes

Demo codes

Development Software

Pico Quick Start

Download Firmware

MicroPython Firmware Download

C_Blink Firmware Download

Video Tutorial

Pico Tutorial I - Basic Introduction

Pico Tutorial II - GPIO

Pico Tutorial III - PWM

Pico Tutorial IV - ADC

Pico Tutorial V - UART

Pico Tutorial VI - To be continued...

MicroPython Series

C/C++ Series

Arduino IDE Series

Install Arduino IDE

Download the Arduino IDE installation package from Arduino website.
Just click on "JUST DOWNLOAD".
Click to install after downloading.
Note: You will be prompted to install the driver during the installation process, we can click Install.

Install Arduino-Pico Core on Arduino IDE

Open Arduino IDE, click the File on the left corner and choose "Preferences".

Add the following link in the additional development board manager URL, then click OK.

https://github.com/earlephilhower/arduino-pico/releases/download/global/package_rp2040_index.json

Note: If you already have the ESP8266 board URL, you can separate the URLs with commas like this:

https://dl.espressif.com/dl/package_esp32_index.json,https://github.com/earlephilhower/arduino-pico/releases/download/global/package_rp2040_index.json

Click on Tools -> Dev Board -> Dev Board Manager -> Search for pico, it shows installed since my computer has already installed it.

Upload Demo At the First Time

Press and hold the BOOTSET button on the Pico board, connect the Pico to the USB port of the computer via the Micro USB cable, and release the button when the computer recognizes a removable hard drive (RPI-RP2).
Download the demo, open arduino\PWM\D1-LED path under the D1-LED.ino.
Click Tools -> Port, remember the existing COM, do not need to click this COM (different computers show different COM, remember the existing COM on your computer).
Connect the driver board to the computer with a USB cable, then click Tools -> Ports, select uf2 Board for the first connection, and after the upload is complete, connecting again will result in an additional COM port.
Click Tool -> Dev Board -> Raspberry Pi Pico/RP2040 -> Raspberry Pi Pico.
After setting, click the right arrow to upload.
- If you encounter problems during the period, you need to reinstall or replace the Arduino IDE version, uninstall the Arduino IDE needs to be uninstalled cleanly, after uninstalling the software you need to manually delete all the contents of the folder C:\Users\[name]\AppData\Local\Arduino15 (you need to show the hidden files in order to see it) and then reinstall.

Pico-W Series Tutorial (To be continued...)

Open Source Demo

Support

If you require technical support, please go to the Support page and open a ticket.

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