M5Stamp C3U (5pcs) ESP32-C3 Wi-Fi IoT Modules for Smart Projects

The M5Stamp C3U (5-pack) is a compact, high performance IoT development module based on the ESPRESSIF ESP32-C3 RISC-V processor, ideal for developers working on home automation, industrial IoT, and wireless smart device integration. Designed with WiFi 5 (LE) connectivity, this module supports secure communication, fast processing, and robust functionality in a miniature form factor.

Built for flexibility, the M5Stamp C3U offers multiple soldering options, high heat resistance, and support for Arduino and ESP-IDF environments. Whether you’re a maker building smart home gadgets or an engineer deploying automation systems, this 5-pack bundle is your go-to solution for ESP32-based development in New Zealand IoT ecosystems.

Key Features & Benefits

✅ Powerful ESP32-C3 RISC-V MCU

• 32-bit core, 160 MHz max clock speed

• 400 KB internal RAM & 4MB Flash storage

• Built-in AES-128-XTS flash encryption & RSA-3072 secure boot

✅ Reliable Wireless Communication

• WiFi 5 (802.11 b/g/n) support

• 3D antenna ensures strong signal stability for connected devices

✅ Compact & High Temperature Resistant Design

• Heat-resistant plastic enclosure (up to 230°C peak)

• Ideal for solder reflow applications and industrial environments

✅ Flexible I/O & USB Connectivity

• 14 GPIO pins for custom input/output

• USB Type-C port for fast programming

• Integrated DC/DC (5V to 3.3V), RGB LED, Reset & Function buttons

✅ Versatile Soldering & Mounting Options

• Compatible with SMT, DIP, and flywire soldering methods

• Easy integration into a wide range of DIY and commercial projects

✅ Cross-Platform Development Support

• Compatible with Arduino, ESP-IDF (UIFlow support coming soon)

• Works seamlessly for IoT prototyping and smart automation in NZ

What’s in the Box?

• 5 × M5Stamp C3U modules

• 5 × Heat-resistant stickers

Perfect for developers, makers, and IoT startups in NZ building with ESP32-C3, this bundle offers unbeatable value and versatility.

Ideal Applications

• 🏡 Smart Home Automation (lighting, climate, sensors)

• 🏭 Industrial Automation (monitoring, control systems)

• 🌐 IoT Prototyping & Custom Hardware Development

• 🔐 Secure Wireless Devices for connected environments

• 🧪 Educational Use & Maker Projects

Why Choose the M5Stamp C3U (5-Pack)?

✔ Built on proven ESP32-C3 technology
✔ Secure, wireless communication in a compact form
✔ Excellent for DIY electronics, rapid prototyping, and IoT startups
✔ Supports New Zealand IoT developers with global-standard features
✔ Ideal for both individual projects and production-level designs

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, 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

Specifications