Stamp-C3U

SKU:C122-B

Description

Stamp-C3U is a cost-effective RISC-V minimal core board. It uses the Espressif ESP32-C3 as the main control chip, which features a RISC-V 32-bit single-core processor with a clock speed of up to 160 MHz. It comes with 400 KB SRAM + 4MB FLASH and integrates 2.4 GHz Wi-Fi. The core board supports security mechanisms such as secure boot, flash encryption, and digital signatures. Despite its compact size, it is highly functional and can meet diverse IoT application needs.

Tutorial

Arduino IDE

This tutorial will introduce how to control the Stamp-C3U device through programming with the Arduino IDE.

Features

Supports multiple application forms (SMT, DIP, flying leads)
Equipped with high-temperature plastic armor, supports SMT reflow temperature (230°C)
Includes 5V->3.3V DC/DC circuit, GPIOx14
Type-C interface
Programmable RGB LED x1, reset button x1, button x1
High-performance 3D antenna, providing stable and reliable wireless communication quality
ESP32 minimal system board
Development Platform
- Arduino IDE
- ESP-IDF
- PlatformIO

Includes

5 x Stamp-C3U
5 x High-temperature resistant stickers

Applications

DIY, prototyping
Industrial automation
Smart home

Specifications

Specification	Parameter
SoC	ESP32-C3@32-bit RISC-V single-core processor, up to 160MHz
Flash	4MB
SRAM	400KB
ROM	384KB
RTC SRAM	8KB
Wi-Fi	2.4 GHz Wi-Fi (supports 20/40MHz bandwidth, 802.11 b/g/n, up to 150Mbps)
Input Voltage	5V@500mA
Human Interaction	Programmable physical button x 1, reset/debug button x 1, programmable RGB LED (SK6812) x 1
USB Interface	USB Type-C x1
Antenna Type	2.4G 3D antenna
Module Peripheral Interface Resources	ADC, GPIO, SPI, UART, I2C, I2S, PWM, RMT, DMA, USB serial, TWAI
IO Interface x14	G0, G1, G3, G4, G5, G6, G7, G8, G9, G10, G18, G19, G21, G22
IO Interface Pitch	2.54mm
Mounting Screw Spec	M2 x 4 countersunk hex key machine screw
Product Size	34.0 x 20.0 x 4.6mm
Product Weight	4.1g
Package Size	138.0 x 93.0 x 7.0mm
Gross Weight	22.8g

Learn

Entering Program Download Mode:
1. Press and hold the center button (G9) on Stamp-C3U while power is off.
2. Connect to a computer, and after successfully identifying the port, proceed with program burning.
USB CDC Enable:
By default, USB CDC is disabled, and the serial output of C3U will be through UART0. If you need to output via USB, please enable the USB CDC option in the IDE before downloading the program. (Arduino users can enable it via Tools->USB CDC on Boot-Enabled, IDF users please refer to the ESP IDF official documentation.)

Shell Supports Reflow Soldering Temperature Curve

Schematics

PinMap

SK6812, Button

ESP32-C3	G2	G9
SK6812	DI	/
Button	/	SW

Model Size

PCB

LCEDA Stamp-C3U Component

Datasheets

ESP32-C3

Softwares

Arduino

Stamp-C3U Arduino Quick Start

ESP-IDF

Stamp-C3U RGB LED Example

Video

Product Comparison

The difference between C3U and C3 is that Stamp-C3U has removed the USB download chip and instead uses the built-in USB Serial of ESP32-C3 for program downloading.

Model	Main Control	IO Count	Button IO	USB Download Chip	USB Interface Function
Stamp-C3	ESP32-C3	13	G3	CH9102	Download / Serial
Stamp-C3U	ESP32-C3	14	G9	/	Download / JTAG / CDC Serial

To compare information on the Stamp series products, you can visit the Product Selection Table, check the target products, and get the comparison results. The selection table covers key information such as core parameters and functional features, and supports comparison of multiple products simultaneously.