Description M5Stack Stamp-C3U is a compact ESP32-C3 core module built for small IoT devices, embedded control, and flexible prototyping. This listing includes two related variants: the bare Stamp-C3U module and the accessory-focused Stamp-C3U Mate kit. Both are built around the ESP32-C3 with 4MB Flash, 400KB SRAM, 2.4GHz Wi-Fi, USB Type-C, and a programmable RGB LED, making them practical choices for RISC-V IoT prototyping and smart device development. For teams building compact nodes, M5Stack Stamp-C3U is a strong foundation. Features M5Stack Stamp-C3U provides a compact ESP32-C3 core module with 14 GPIO resources. The board supports SMT, DIP, and flying-lead style integration for flexible product builds. The Stamp-C3U module includes USB Type-C, a programmable RGB LED, reset button, and user button. The Stamp-C3U Mate kit adds headers, HY2.0 sockets, and installation accessories for faster breadboard or circuit integration. Both variants are well suited to RISC-V IoT prototyping, compact wireless nodes, and smart device development. For low-footprint products, M5Stack Stamp-C3U remains a practical ESP32-C3 core module choice. Specifications Specification Parameter SoC ESP32-C3@32-bit RISC-V Single-Core Processor, Main Frequency 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-Machine Interaction Programmable Physical Button x 1, Reset/Debug Button x 1, Programmable RGB LED (SK6812) x 1 USB Interface USB Type-C x 1 Antenna Type 2.4G 3D Antenna Module Peripheral Interface Resources ADC, GPIO, SPI, UART, I2C, I2S, PWM, RMT, DMA, USB Serial, TWAI IO Interfaces x14 G0, G1, G3, G4, G5, G6, G7, G8, G9, G10, G18, G19, G21, G22 IO Interface Pitch 2.54mm Mounting Screw Specification M2 x 4 Countersunk Hex Socket Machine Screw Product Size 34.0 x 20.0 x 4.6mm Product Weight 3.5g Package Size 138.0 x 93.0 x 5.6mm Gross Weight 9.8g Applications M5Stack Stamp-C3U is useful for compact wireless controllers, custom sensors, and low-footprint ESP32-C3 core module designs. The bare Stamp-C3U module is better when space and direct integration matter, while the Stamp-C3U Mate kit is better for quick assembly, breakout-style work, and RISC-V IoT prototyping that needs headers and sockets from the start. Both variants support fast smart device development for compact products and custom wireless tools, and both variants keep RISC-V IoT prototyping simple for small connected builds. Product List M5-C122-B 5 ×M5-K122 M5-K122 1 × Stamp-C3U 1 × High-temperature Sticker 2 × 2.54-12P Female Header 2 × 2.54-10P Male Header 2 × HY2.0-4P Female Socket (90°) 1 × Hex Key L-Shape 1.5 mm (For M2 Screw) Other Content The pin map, size drawing, and schematic are helpful when deciding which variant is better for direct soldering, breakout wiring, or enclosure planning. Resources Stamp-C3U Official Docs Stamp-C3U Mate Official Docs ESP32-C3 Datasheet UiFlow2 FAQ What is the difference between Stamp-C3U and Stamp-C3U Mate?The Stamp-C3U module is the bare minimum core board, while the Stamp-C3U Mate kit adds practical headers and sockets for easier prototyping. What kind of projects are they good for?Both variants are excellent for RISC-V IoT prototyping, compact wireless nodes, and smart device development built around an ESP32-C3 core module. If you need a small Wi-Fi controller, M5Stack Stamp-C3U is the more direct option, while the Stamp-C3U Mate kit is better for quick integration work.
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