Pico-2CH-RS232

Pico-2CH-RS232 2-Channel RS232 Module for Raspberry Pi Pico, SP3232EEN Transceiver, UART To RS232

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Onboard Interfaces

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Overview

Provide Pico C demo.

Specifications

• Operating voltage: 3.3V~5V
• RS232 Transceiver: SP3232EEN
• Communication bus: UART
• Baud rate: 300 ~ 912600bps
• Dimension: 21.00（H）x 52.00（V） mm

Pinout

Controller

The SP3232E series is a solution for RS232 transceivers for portable or handheld applications such as notebooks or PDAs. the SP3222E/3232E series has a highly efficient charge pump that requires only 0.1F capacitance for operation at an operating voltage of 3.3V.

Pico User Guide

Hardware connection

When connecting PICO/PICO2, please pay attention not to connect in the opposite direction. The direction can be judged by observing the USB screen printing end of the module and the USB interface of the PICO/PICO2 (also can be judged by the pin label of the platoon master on the module and the pin label of the Pico).
You can also wire it according to the table below:

RS485	Pico	Description
VCC	VSYS	Power input
GND	GND	Ground
TXD0	GP0	UART transmit pin
RXD0	GP1	UART receive pin
TXD1	GP4	UART transmit pin
RXD1	GP5	UART receive pin

Connection

The connection of the RS485 board is the same as the Pico-2CH-RS232.

Setup environment

• 1. To setup the Pico for working, please refer to the official guide: this link.
• 2. For Windows environment setting, you can refer to this link.
  

Download example

Open a terminal and run the follow command

sudo apt-get install p7zip-full
cd ~
sudo wget https://files.waveshare.com/upload/5/5a/Pico_2CH_RS232_Code.7z
7z x Pico_2CH_RS232_Code.7z -o.
cd ~/Pico_2CH_RS232_Code
cd C/build/

Run the examples

C codes

• The following tutorials are operated on the Raspberry Pi, but as CMake has multi-platforms and is portable, it can be successfully compiled on the PC, but the operation is slightly different, and you need to judge by yourself.

To compile, make sure you are in the c directory:

cd ~/Pico_2CH_RS232_Code/c/

Create the build folder and add the SDK path to it:
By default, the ../../pico-sdk is the path of SDK.
We have created the build folder in examples, you can just enter it.
Note: If the actual path of your Pi is different, you need to write the correct path.

cd build
export PICO_SDK_PATH=../../pico-sdk

Run the cmake to generate Makefile file.

#Pico
cmake -DPICO_BOARD=pico -DPICO_PLATFORM=rp2040 ..
#Pico2
cmake -DPICO_BOARD=pico2 -DPICO_PLATFORM=rp2350 ..

Run the make command to build the codes and generate an executable file.

make -j9

After building, an uf2 file is generated. Press and hold the key on the Pico board to connect the Pico to the Raspberry Pi's USB port via the Micro USB cable, then release the key. Once connected, Raspberry will automatically recognize a removable disk (RPI-RP2). Copy the file main.uf2 in the corresponding folder to the recognized removable disk (RPI-RP2).

#Pico
cp main.uf2 /media/pi/RPI-RP2/
#Pico2
cp main.uf2 /media/pi/RP2350

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).
  
  • Pico: rp2-pico-20210418-v1.15.uf2
  • Pico 2: rp2-pcio2-20240809-v1.24.0.uf2
• 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, select Pico/Pico2 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 flashing the firmware is the same as on Windows, and you have the option of copying the .uf2 format file into the Pico/Pico2 on your PC or Raspberry Pi.
• 2. Open the Thonny IDE on the Raspberry Pi (click on the Raspberry logo -> Programming -> Thonny Python IDE) and you can view the version information at Help -> About Thonny.
• 3. Open the Thonny IDE in Raspberry Pi, update it if it doesn't support Pico
• 4. Configure the port by choosing MicroPython(Raspberry Pi and ttyACM0 port) in Tools -> Options... -> Interpreter

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

sudo apt upgrade thonny

• Choose File->Open...->python/ and select the corresponding .py file to run the codes.
  

Resource

Documentation

• Schematic
• SP3232EEN Datasheet

Demo Codes

• Demo code

Serial Port Assistant

• SSCOM5.13.1

Development Software

• Zimo221.7z
• Image2Lcd.7z
• Font Library Tutorial
• Image Extraction Tutorial
• Thonny Python IDE (Windows V3.3.3)

Pico Quick Start

Firmware Download

• MicroPython Firmware Download

• C_Blink Firmware Download

Firmware Download

• MicroPython Firmware Download

• C_Blink Firmware Download

Text Tutorial

Introduction

• Raspberry Pi Pico

MicroPython Series

• 【MicroPython】 machine.Pin Function
• 【MicroPython】 machine.PWM Function
• 【MicroPython】 machine.ADC Function
• 【MicroPython】 machine.UART Function
• 【MicroPython】 machine.I2C Function
• 【MicroPython】 machine.SPI Function
• 【MicroPython】 rp2.StateMachine

C/C++ Series

For C/C++, it is recommended to use Pico VS Code for development. This is a Microsoft Visual Studio Code extension designed to make it easier for you to create, develop, and debug projects for the Raspberry Pi Pico series development board. Whether you are a beginner or an experienced professional, this tool can help you confidently and easily develop Pico. Below we will introduce how to install and use the extension.

• Official website tutorial: https://www.raspberrypi.com/news/pico-vscode-extension/.
• This tutorial is applicable to Raspberry Pi Pico, Pico2, and our company's RP2040 and RP2350 series development boards.
• The development environment defaults to Windows as an example. For other environments, please refer to the official website tutorial for installation.

Arduino IDE Series

Install Arduino IDE

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

Install Arduino-Pico Core on Arduino IDE

1. Open Arduino IDE, click the File on the left corner and choose "Preferences".
   
2. Add the following link in "Additional boards manager URLs", then click OK.
   

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

   
   Note: If you already have the ESP32 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
   

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

Upload Demo At the First Time

1. 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).
   
   
2. Download the demo from #Resource, open the D1-LED.ino under arduino\PWM\D1-LED path.
3. 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).
   
4. 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.
   
5. Click Tools -> Board -> Raspberry Pi Pico/RP2040 -> Raspberry Pi Pico.
   
6. 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 clean, 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.

Open Source Demo

• MicroPython Demo (GitHub)
• MicroPython Firmware/Blink Demo (C)
• Official Raspberry Pi C/C++ Demo
• Official Raspberry Pi MicroPython Demo
• Arduino Official C/C++ Demo

Support

Technical Support

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