RP2350 2.1inch Capacitive Touch Round Display Development Board

The Waveshare RP2350 2.1-inch Round Touch Display Development Board is a high-performance, feature-rich microcontroller platform designed to help developers, engineers, and makers rapidly prototype embedded systems and smart devices.
Combining the Raspberry Pi–designed RP2350B chip with a vivid round 2.1-inch IPS touch display, this board delivers exceptional visual clarity, computing performance, and expandability — all in a compact, elegant form factor.

Version Options

Both variants include capacitive touch support:

• RP2350-Touch-LCD-2.1: Flat touch panel version

• RP2350-Touch-LCD-2.1B: 2.5D curved touch panel version, offering enhanced visual appeal and smooth edge transitions

High-Performance Dual-Core Architecture

At its heart, the RP2350B microcontroller—developed by Raspberry Pi in the UK—introduces a unique dual-core, dual-architecture design:

• Dual ARM Cortex-M33 cores, or

• Dual Hazard3 RISC-V cores

This versatile configuration allows developers to explore both industry-standard Arm and open RISC-V architectures within one platform, running at clock speeds up to 150 MHz.

Key on-chip resources include:

• 520 KB SRAM

• 16 MB onboard Flash memory

• Optional PSRAM expansion (solder pads provided)

• On-chip temperature sensor and precision clock/timer

• 12 Programmable I/O (PIO) state machines for advanced custom peripheral control

Brilliant Round IPS Touch Display

• Display size: 2.1 inches

• Resolution: 480 × 480 pixels

• Panel type: IPS (wide viewing angle, 65K colors)

• Display driver IC: ST7701

• Touch type: Capacitive (CST820 controller, I²C interface)

• Touch points: Single-point touch

The vivid 480×480 round display offers smooth visuals, wide viewing angles, and responsive touch interaction, making it ideal for smart UI applications, portable devices, or wearable tech.

Comprehensive Peripheral Integration

The board integrates a rich set of onboard components and interfaces:

• 6-axis IMU (QMI8658): 3-axis accelerometer + 3-axis gyroscope for motion sensing

• RTC chip (PCF85063): Real-time clock with backup battery support

• TF card slot: Expandable storage for data logging and media

• USB Type-C port: Supports USB 1.1 device and host modes; enables drag-and-drop programming via mass storage

• Battery management system: Charging circuit with power and charging indicators

• Buzzer, RESET, and BOOT buttons for system control and programming

• Headers: I²C, UART, DEBUG, 12-pin multifunction GPIO header, RTC battery connector, and 3.7V lithium battery connector

Flexible I/O and Connectivity

• 9× Multi-function GPIO pins

• 2× SPI, 2× I²C, 2× UART interfaces

• 5× 12-bit ADC inputs

• 9× controllable PWM channels

This makes the RP2350 board adaptable for a wide range of projects — from sensor monitoring to human–machine interfaces (HMI) and embedded automation systems.

Software Compatibility & Development Environment

The RP2350 platform supports multiple development frameworks, ensuring maximum flexibility for creators and engineers:

• C/C++

• MicroPython

• Arduino IDE

A comprehensive SDK, documentation, and tutorials are provided to help you get started quickly and accelerate development.

Mechanical Design & Build Quality

• Display size: 2.1-inch round

• Available as flat or 2.5D curved panel

• Compact dimensions, optimized for integration in handheld and embedded devices

• High-quality construction for durability and long-term stability

Typical Application Scenarios

• Smart home control interfaces

• Portable data monitors

• Embedded HMI and UI displays

• Wearable and fitness devices

• Industrial sensors and dashboards

• Educational and experimental microcontroller projects