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CONTENTS

STAMP-C3U

SKU:C122-B, K122

Quick-Start

ESP-IDF

Description

The newly M5Stamp C3U featuring ESPRESSIF ESP32-C3 RISC-V MCU, with Wi-Fi 5 (LE) connectivity, applicable for home appliances and Industrial Automation. By combining RSA-3072-based secure boot and the AES-128-XTS-based flash encryption. The compact size and powerful functions, make it applicable for multiple IoT scenarios.

The M5Stamp C3U is based on 32-bit RISC-V micro controller, and operates at a maximum clock frequency of 160 MHz. With 400 KB of internal RAM and 4 MB Flash, it can facilitate many different use cases, involving connected devices. The M5Stamp C3U provides, Furthermore, the exceptional heat resistance plastic enclosure is sustained at a higher operating temperature.

Note: If you need to use SPIFFS filesystem in Arduino IDE. Please install a patch package first.

Product Features

  • MULTIPLE STYLE:

    • Three types soldering options are available (SMT, DIP, fly wire);
    • High-temperature resistant plastic enclosure, Peak temperature = 230℃;

  • HIGH INTEGRATION:

    • M5Stamp C3 contains 5V->3.3V DC/DC design, GPIOx14;
    • USB Type C port;
    • Programmable RGB LED x1, Reset button x1, button x1;
    • 3D antenna, providing stable and reliable wireless communication.

  • DEVELOPMENT PLATFORM:

    • Arduino, ESP32-IDF (UIFlow support coming soon)

Application

  • DIY, Prototyping
  • Industrial Automation
  • Smart Home
  • Wearable Devices
  • Medical Devices
  • Consumer Electronics

Note: The newly updated C3U shares the same features as C3, but the difference is that M5Stamp C3U without the USB download chip and the program download method is different（(The C3U uses the ESP32-C3's built-in USB Serial for program download)）. If you are looking for a more affordable project, you can add this to your shopping list!

Program Download/Notes

Enter the program download mode operation:
1. Long press the center button (G9) of STAMP C3U under power failure condition.
2. Connect to the computer while holding the button, after the port is successfully identified, program burning.
USB CDC enabled:
By default, USB CDC is not enabled, the serial port output started by C3U will be output through UART0, if you need to output through USB, please use IDE to make it USB CDC before downloading the program option enabled. (Arduino users can enable it through Tools->USB CDC on Boot-Enabled, IDF users please refer to ESP IDF official documentation.)

product comparison

Model Master IO quantity Button IO USB chip USB interface function
STAMP-C3 ESP32-C3 13 G3 CH9102 Download / Serial
STAMP-C3U ESP32-C3 14 G9 / Download / JTAG / CDC Serial

Specifications

Specifications Parameters
ESP32-C3 32bit RISC-V single-core processor, clocked at 160 MHz
Storage 384KB ROM, 400KB SRAM, 8KB RTC SRAM, 4MB FLASH
Wi-Fi 2.4 GHz band supports 20 MHz and 40 MHz bandwidth, IEEE 802.11 b/g/n protocol, data rate up to 150 Mbps
Input voltage 5V @ 500mA
HMI Programmable physical button x 1, reset debugging button x 1, programmable RGB LED (SK6812) x 1
USB interface TypeC x1
Antenna Type 2.4G 3D Antenna
Module peripheral interface resources ADC, GPIO, SPI, UART, I2C, I2S, PWM, RMT, DMA, USB serial port, TWAI
IO interface x14 G0, G1, G3, G4, G5, G6, G7, G8, G9, G10, G18, G19, G21, G22
IO interface spacing 2.54mm
Fixing screw specifications M2*4 countersunk head hexagon socket mechanical teeth
Net weight 3.8g
Product size 34 * 20 * 4.6mm
Packing size 85*55mm sealing bag (translucent)

Include

  • Purchase link
  • M5Stamp C3U (5pcs):
    • 5 x M5Stamp C3U
    • 5 x Heat Resistant Sticker
  • Purchase link
  • M5Stamp C3U Mate:
    • 1 x M5Stamp C3U
    • 1 x Heat Resistant Sticker
    • 2 x 2.54-12P female headers
    • 2 x 2.54-10P pin headers
    • 2 x 90° HY2.0-4P terminals
    • 1 x 1.5mm hex key

PinMap

SK6812 (RGB LED) and Button

ESP32 GPIO2 GPIO9
SK6812 DI /
Button / SW

Schematic

Module size

  • C3&C3U

The shell supports Reflow Profile

Example

ESP-IDF

Video

Compare