Description M5Stack Stamp-C3 is a compact ESP32-C3 development module for cost-sensitive IoT products, small controllers, and embedded wireless devices. Built around the Espressif ESP32-C3 SoC, this ESP32-C3 RISC-V module integrates a 32-bit single-core RISC-V processor running up to 160MHz, 400KB SRAM, 4MB Flash, and 2.4GHz Wi-Fi connectivity. The Stamp-C3 IoT module is delivered as a 5-piece pack, making it suitable for prototyping, pilot builds, and small production batches. M5Stack Stamp-C3 supports multiple installation methods, including SMT, DIP, and flying-lead mounting. Its high-temperature plastic enclosure is compatible with reflow at 230 degrees C, and the board provides a 5V to 3.3V DC/DC circuit, USB Type-C, 13 GPIOs, one programmable RGB LED, one reset/debug button, and one programmable physical button. For wireless IoT designs, the ESP32-C3 RISC-V module also supports security features such as secure boot, Flash encryption, and digital signature. Compared with larger ESP32 development boards, the Stamp-C3 IoT module focuses on a tiny footprint, easy mounting, and reliable 2.4GHz communication through its 3D antenna. M5Stack Stamp-C3 is a practical choice when a project needs Wi-Fi, GPIO expansion, USB serial programming, and ESP32-C3 RISC-V performance in a very small module format. For carrier boards and compact fixtures, the Stamp-C3 IoT module keeps the official 13-GPIO layout accessible on a 2.54mm pitch. Features M5Stack Stamp-C3 compact module: tiny ESP32-C3 system board for space-constrained IoT products and embedded controllers. ESP32-C3 RISC-V module: 32-bit single-core RISC-V processor with main frequency up to 160MHz. Wireless connectivity: 2.4GHz Wi-Fi with 802.11 b/g/n support and up to 150Mbps data rate. Flexible mounting: supports SMT, DIP, and flying-lead installation methods. Reflow-compatible enclosure: high-temperature plastic shield supports reflow at 230 degrees C. Onboard interfaces: USB Type-C, 13 GPIOs, programmable RGB LED, reset/debug button, and user button. Development support: the Stamp-C3 IoT module supports Arduino IDE, ESP-IDF, and PlatformIO workflows. Security features: supports secure boot, Flash encryption, digital signature, and other ESP32-C3 security functions. Specifications Product Name Stamp-C3 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 2.4GHz 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 x13 G21, G20, G9, G18, G19, G1, G0, G10, G8, G7, G6, G5, G4 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 Single Product Weight 4.1g Package Size 138.0 x 93.0 x 5.6mm Gross Weight 23.3g Applications DIY prototyping: use M5Stack Stamp-C3 as a compact Wi-Fi controller for breadboard, carrier-board, and enclosure experiments. Industrial automation: the ESP32-C3 RISC-V module is suitable for small status nodes, sensor interfaces, and control modules. Smart home devices: the Stamp-C3 IoT module can power compact Wi-Fi endpoints for switches, sensors, and appliance control. Small production batches: the 5-piece pack is useful for repeat prototypes, fixture builds, and field test devices based on the Stamp-C3 IoT module. Wireless embedded systems: use M5Stack Stamp-C3 where a tiny ESP32-C3 RISC-V board with USB-C and GPIO resources is required. Product List 5 Stamp-C3 5 High-temperature labels Other Content PinMap The ESP32-C3 RISC-V module exposes 13 IO interfaces with 2.54mm pitch. The official PinMap helps map GPIOs before designing a carrier board or wiring harness. SK6812 and Button Mapping ESP32-C3 G2 G3 SK6812 DI / Button / SW Schematic and Model Size The official schematic and mechanical size drawings are useful when integrating M5Stack Stamp-C3 into a custom PCB, fixture, or enclosure. Reflow Note The high-temperature enclosure supports reflow at 230 degrees C, helping the Stamp-C3 IoT module fit SMT production workflows. Resources M5Stack Stamp-C3 Official Documentation Stamp-C3 Arduino Quick Start Stamp-C3 Arduino Test Program Stamp-C3 ESP-IDF RGB LED Control Example ESP32-C3 Datasheet Stamp-C3 KiCad Library Stamp-C3 PcbDoc Footprint CH9102 Windows USB Driver CH9102 macOS USB Driver FAQ What is included with M5Stack Stamp-C3 C056-B? The official package includes 5 x Stamp-C3 modules and 5 x high-temperature labels. Which processor does Stamp-C3 use? M5Stack Stamp-C3 uses the ESP32-C3 SoC with a 32-bit single-core RISC-V processor running up to 160MHz. Does this module support Wi-Fi? Yes. The ESP32-C3 RISC-V module supports 2.4GHz Wi-Fi with 802.11 b/g/n and up to 150Mbps data rate. Which development platforms are supported? The official resources cover Arduino IDE, ESP-IDF, and PlatformIO. The Stamp-C3 IoT module also has Arduino and ESP-IDF examples from M5Stack. Can Stamp-C3 be used in reflow production? Yes. The high-temperature plastic shield is compatible with SMT reflow at 230 degrees C, making M5Stack Stamp-C3 suitable for compact production-oriented designs. How many GPIOs are available? The module exposes 13 IO interfaces: G21, G20, G9, G18, G19, G1, G0, G10, G8, G7, G6, G5, and G4.
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