Overview

RP2350-Plus

USB Type-C

Introduction

This product is developed based on the RP2350 development board, it is an enhanced version of the Raspberry Pi Pico 2.
Based on compatibility with the majority of Raspberry Pi Pico 2 modules, enhance or add some extra features.

Features

Adopts RP2350A microcontroller chip designed by Raspberry Pi in the United Kingdom
Adopts unique dual-core and dual-architecture design, equipped with dual-core ARM Cortex-M33 processor and dual-core Hazard3 RISC-V processor, with clock operating frequencies up to 150MHz
Built-in 520KB of SRAM and 4MB of on-chip Flash
Using Type-C interface, keeping up with the trend of the times, no need to entangle the front and back plugging
Onboard Lithium battery recharge/discharge header, which facilitates the use of this product in mobile scenarios
Onboard DC-DC chip MP28164, a high-efficiency DC-DC buck-boost chip with a load current of up to 2A
Castellated module allows soldering directly to carrier boards
USB1.1 host and device support
Supports low-power sleep and hibernation modes
Drag-and-drop downloads can be made by USB recognition as mass storage
26 × multi-functional GPIO pins
Multiple hardware peripherals
- SPI × 2
- I2C × 2
- UART × 2
- 12-bit ADC × 4
- Controllable PWM channel × 16
Accurate clock and timer on-chip
Temperature sensor
Accelerated floating-point libraries on-chip
12 × Programmable I/O (PIO) state machines for custom peripheral support

Pinout Definition

Dimensions

Pico Getting Started

Firmware download

MicroPython firmware download

C_Blink firmware download

Text tutorial

Introduction

Raspberry Pi Pico Basics

MicroPython series

Install Thonny IDE

In order to facilitate the development of Pico/Pico2 boards using MicroPython on a computer, it is recommended to download the Thonny IDE

Download Thonny IDE and follow the steps to install, the installation packages are all Windows versions, please refer to Thonny's official website for other versions
After installation, the language and motherboard environment need to be configured for the first use. Since we are using Pico/Pico2, we select the Raspberry Pi option for the motherboard environment

Configure MicroPython environment and choose Pico/Pico2 port
- Connect Pico/Pico2 to your computer first, and in the lower right corner of Thonny left-click on the configuration environment option --> select Configture interpreter
- In the pop-up window, select MicroPython (Raspberry Pi Pico), and choose the corresponding port

Click OK to return to the Thonny main interface, download the corresponding firmware library and burn it to the device, and then click the Stop button to display the current environment in the Shell window
- Pico firmware library
- Pico2 firmware library
How to download the firmware library for Pico/Pico2 in windows: After holding down the BOOT button and connecting to the computer, release the BOOT button, a removable disk will appear on the computer, copy the firmware library into it
How to download the firmware library for RP2040/RP2350 in windows: After connecting to the computer, press the BOOT key and the RESET key at the same time, release the RESET key first and then release the BOOT key, a removable disk will appear on the computer, copy the firmware library into it (you can also use the Pico/Pico2 method)

Details

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 boards. No matter if you are a beginner or an experienced professional, this tool can assist you in developing Pico with confidence and ease. Here's 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 the RP2040 and RP2350 series development boards developed by our company
The default development environment is Windows. For other environments, please refer to the official website tutorial for installation

Install VSCode

Firstly, click to download pico-vscode package, unzip and open the package, double-click to install VSCode

Note: If vscode is already installed, check if the version is v1.87.0 or higher

Install extension

Click on EXTENSIONS, select Install from VSIX
Select the package with vsix suffix, click Install
Then vscode will automatically install Raspberry Pi Pico and its dependent extensions. You can click Refresh to view the installation progress
The bottom right corner shows installation completed, close vscode

Configure extension

Open the directory C:\Users\username and copy the entire .pico-sdk to that directory
The copy is completed

Open VSCode and configure various paths in the Raspberry Pi Pico extension

The configuration is as follows:

Cmake Path:
${HOME}/.pico-sdk/cmake/v3.28.6/bin/cmake.exe

Git Path:
${HOME}/.pico-sdk/git/cmd/git.exe    

Ninja Path:
${HOME}/.pico-sdk/ninja/v1.12.1/ninja.exe

Python3 Path:
${HOME}/.pico-sdk/python/3.12.1/python.exe

New project

Configuration is completed, then create a new project. First enter the project name, select the path, and click Create to create the project
To test the official example, you can click Example next to the project name to select
The project was created successfully
Select SDK version
Select Yes for advanced configuration
Select the cross-compilation chain, 13.2.Rel1 is for ARM cores, RISCV.13.3 is for RISCV cores, and you can choose one of them according to your needs
Selects Default (the path configured earlier) for CMake version
Select Default for Ninja version
Select development board
Click Complie to compile
The uf2 format file is successfully compiled

Import project

The Cmake file for importing the project cannot have Chinese (including comments), otherwise it may cause import failure
To import your own project, you need to add a line of code to the Cmake file to switch between pico and pico2 normally, otherwise even if pico2 is selected, the compiled firmware will still be suitable for pico
```
set(PICO_BOARD pico CACHE STRING "Board type")
```

Update extension

The extension version in the offline package is 0.15.2, and you can also choose to update to the latest version after the installation is complete

Arduino IDE series

Install Arduino IDE

First, go to Arduino official website to download the installation package of the Arduino IDE.
Here, you just need to select to download.
Once the download is complete, click Install.

Notice: During the installation process, it will prompt you to install the driver, just click Install

Arduino IDE interface

After the first installation, when you open the Arduino IDE, it will be in English. You can switch to other languages in File --> Preferences, or continue using the English interface.
In the Language field, select the language you want to switch to, and click OK.

Install Arduino-Pico Core in the Arduino IDE

Open the Arduino IDE, click on the file in the top left corner, and select Preferences

Add the following link to the attached board manager URL, and then click OK

https://github.com/earlephilhower/arduino-pico/releases/download/4.0.2/package_rp2040_index.json

Note: If you already have an ESP32 board URL, you can use a comma to separate the URLs as follows:

https://dl.espressif.com/dl/package_esp32_index.json,https://github.com/earlephilhower/arduino-pico/releases/download/4.0.2/package_rp2040_index.json

Click Tools > Development Board > Board Manager > Search pico, as my computer has already been installed, it shows that it is installed

First upload of the program

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 after the computer recognizes a removable hard disk (RPI-RP2).
Download the program and open D1-LED.ino under the arduino\PWM\D1-LED path
Click Tools --> Port, remember the existing COM, do not click this COM (the COM displayed is different on different computers, remember the COM on your own computer)
Connect the power board to the computer using a USB cable. Then, go to Tools > Port. For the first connection, select uf2 Board. After uploading, when you connect again, an additional COM port will appear
Click Tools > Development Board > Raspberry Pi Pico > Raspberry Pi Pico or Raspberry Pi Pico 2
After setting it up, click the right arrow to upload the program

If issues arise during this period, and if you need to reinstall or update the Arduino IDE version, it is necessary to uninstall the Arduino IDE completely. After uninstalling the software, you need to manually delete all contents within the C:\Users\[name]\AppData\Local\Arduino15 folder (you need to show hidden files to see this folder). Then, proceed with a fresh installation.

Open source demos

MircoPython video demo (github)
MicroPython firmware/Blink demos (C)
Raspberry Pi official C/C++ demo (github)
Raspberry Pi official micropython demo (github)
Arduino official C/C++ demo (github)

Example Experiments

Download the Demo to your computer desktop to conduct some interesting experiments.

External LED experiment

Connect the hardware according to the figure below, connect the Micro USB connected to the computer, open the python file in the demo Lesson-5 External LED in Thonny, and you can see that the red light is flashing when you run the demo.
Precautions for use: The longer pin of the LED is the positive pole, the shorter one is the negative pole, the negative pole should be connected to GND, the positive pole should be connected to the GPIO output port, and the resistor must be connected when using.

Code analysis

led_external = machine.Pin(15, machine.Pin.OUT) #Set GP15 to output mode
while True: 
   led_external.toggle() #Change the state of the LED light every 5 seconds
   utime.sleep(5)

Traffic Light System experiment

Connect the hardware according to the figure below, connect the Micro USB connected to the computer, open the python file in the demo Lesson-9 Traffic-Light-System in Thonny, run the demo to see the traffic lights running normally, and the buzzer will be triggered when the button is pressed.
Precautions for use: The longer pin of the LED is the positive pole, the shorter pin is the negative pole, the negative pole should be connected to GND, the positive pole should be connected to the GPIO output port, and the resistor must be connected when using. The red wire of the buzzer is connected to the GPIO port output, and the black wire is connected to GND.

Code analysis

def button_reader_thread():  #Detect if a button is pressed
   global button_pressed 
   while True:
       if button.value() == 1: 
           button_pressed = True
           
_thread.start_new_thread(button_reader_thread, ()) #Use the thread to detect keystrokes
while True:
   if button_pressed == True: #If the button is pressed, the red light lights up and the buzzer alarms
       led_red.value(1) 
       for i in range(10): 
           buzzer.value(1) 
           utime.sleep(0.2) 
           buzzer.value(0) 
           utime.sleep(0.2) 
       global button_pressed 
       button_pressed = False 
   led_red.value(1)  #In normal circumstances, when the light turns from red to green, the yellow light will be on for two seconds, then the yellow light and red light will go off, and the green light will be on
   utime.sleep(5)     #When the light turns from green to red, the green light goes off first, the yellow light is on for two seconds, and then the red light is on
   led_amber.value(1) 
   utime.sleep(2) 
   led_red.value(0) 
   led_amber.value(0) 
   led_green.value(1) 
   utime.sleep(5) 
   led_green.value(0) 
   led_amber.value(1) 
   utime.sleep(5) 
   led_amber.value(0)

Burglar Alarm LED Buzzer experiment

Connect the hardware according to the figure below, connect the Micro USB connected to the computer, open the python file in the demo Lesson-14 Burglar Alarm LED Buzzer in Thonny, run the demo and you can see that when you move in front of the Passive infrared sensor, the LED light will flash and the buzzer will sound an alarm.

Precautions for use: The middle pin of the Passive infrared sensor is the data output pin, and the pins on both sides can be connected to VCC and GND respectively.

Code analysis

def pir_handler(pin):  #Interrupt handling function, the buzzer sounds, the LED rapidly flashes
   print("ALARM! Motion detected!") 
   for i in range(50): 
       led.toggle() 
       buzzer.toggle() 
       utime.sleep_ms(100)
sensor_pir.irq(trigger=machine.Pin.IRQ_RISING, handler=pir_handler) #Turn on the interrupt, and when the human sensor detects an exception, it will enter the interrupt handling function for processing
while True:  #If there is no exception, the state of LDE will be changed every 5 seconds
   led.toggle() 
   utime.sleep(5)

Potentiometer experiment

Connect the hardware according to the figure below, connect the Micro USB connected to the computer, open the python file in the demo Lesson-16 Potentiometer in Thonny, run the demo, and rotate the potentiometer to see that the voltage value printed out in the Sheel window is also changing.

Precautions for use: The middle pin of the Potentiometer is the data output pin, and the pins on both sides can be connected to VCC and GND respectively.

Code analysis

potentiometer = machine.ADC(26) #Use GP26 as the analog signal collection pin
conversion_factor = 3.3 / (65535)
while True:
   voltage = potentiometer.read_u16() * conversion_factor #Format the collected data and convert it into a voltage value
   print(voltage) #Print the voltage information, the voltage value will change as the sliding varistor rotates
   utime.sleep(2)

WS2812 experiment

Connect the hardware according to the figure below, connect the Micro USB connected to the computer, open the WS2812_RGB_LED.py file in the demo Lesson-25 WS2812 in Thonny, run the demo to see the RGB colors of blue, red, green, and white at once.

Code analysis

#This code uses the state machine mechanism, the following code is a decorator, in which we can initialize the hardware, set the level of the pins, etc.
#label("bitloop") We can define labels in the code to facilitate our execution by jumping to them.
#jmp(not_x,"do_zero") When x=0, we adjust to the label "do_zero".
#nop() .set(0) [T2 - 1] When x=0, it will jump here to execute.
@asm_pio(sideset_init=PIO.OUT_LOW, out_shiftdir=PIO.SHIFT_LEFT, autopull=True, pull_thresh=24)
def ws2812():
   T1 = 2
   T2 = 5
   T3 = 1
   label("bitloop")
   out(x, 1)               .side(0)    [T3 - 1] 
   jmp(not_x, "do_zero")   .side(1)    [T1 - 1] 
   jmp("bitloop")          .side(1)    [T2 - 1] 
   label("do_zero")
   nop()                   .side(0)    [T2 - 1]

# Create the StateMachine with the ws2812 program, outputting on Pin(22).
sm = StateMachine(0, ws2812, freq=8000000, sideset_base=Pin(0)) #Create a state machine
# Start the StateMachine, it will wait for data on its FIFO.
sm.active(1) #Start state machine
# Display a pattern on the LEDs via an array of LED RGB values.
ar = array.array("I", [0 for _ in range(NUM_LEDS)])
print(ar)
print("blue")
for j in range(0, 255): 
   for i in range(NUM_LEDS): 
       ar[i] = j 
   sm.put(ar,8)  The method of #put() is to put the data into the output FIFO of the state machine
   time.sleep_ms(5)

LCD1602 I2C experiment

Connect the hardware according to the figure below, connect the Micro USB connected to the computer, open the python file in the demo Lesson-21 LCD1602 I2C in Thonny, save the RGB1602.py file as a Raspberry Pi Pico, and run the Choose_ Color.py to see a different color switch every 5 seconds; run Discoloration.py file to see the RGB color gradient effect.

Code analysis

Choose_Color.py

#Define color
rgb9 = (0,255,0) #Green
lcd.setCursor(0, 0) #Set cursor position
# print the number of seconds since reset:
lcd.printout("Waveshare") #Write characters
lcd.setCursor(0, 1) #Set the cursor position to the second row and the zero column
lcd.printout("Hello,World!") #Write characters
lcd.setRGB(rgb1[0],rgb1[1],rgb1[2]); #Set the backlight

Discoloration.py

t=0
while True:
 
   r = int((abs(math.sin(3.14*t/180)))*255); #RGB changes over time
   g = int((abs(math.sin(3.14*(t+60)/180)))*255);
   b = int((abs(math.sin(3.14*(t+120)/180)))*255);
   t = t + 3;
   lcd.setRGB(r,g,b); #Reset the RGB value
# set the cursor to column 0, line 1
   lcd.setCursor(0, 0) #Navigate to the first row and the zero column
# print the number of seconds since reset:
   lcd.printout("Waveshare") #Write characters
   lcd.setCursor(0, 1) #Navigate to the second row and the zero column
   lcd.printout("Hello,World!") #Write characters
   time.sleep(0.3)

Resources

Supporting resources

Document

Demos

Official Resources

Pico2

User manuals

Schematic diagram and datasheets

Related books

Raspberry Pi open source demos

FAQ

Question: Is there interference with Raspberry Pi Pico 2?

Answer:

1. The pin that sets the input state must be initialized to pull up or down
2. Replace the USB cable and see if the USB cable is the one causing the problem

Support

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