The newly updated M5Stack M5Stamp C3U features an 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 a 32-bit RISC-V microcontroller 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 a heat resistant plastic enclosure allowing your project to function at a higher operating temperature. 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). Features * High-temperature resistant plastic enclosure, Peak temperature = 230℃; * 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. * Arduino, ESP32-IDF (UIFlow support coming soon) Package Contents * 1x M5Stamp C3U * 1x Heat Resistant Sticker * 2x 2.54-12P header * 2x 2.54-10P header * 2x 90° Grove Connector * 1x M2 Hex Key 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/ 40 MHz, 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 Interfaces 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 Net weight 3.8g Product size 34 * 20 * 4.6mm Packing size 85*55mm sealing bag (translucent) Resources * All Documentation * Pinout * Schematic * ESP32-C3 Datasheet https://elecena.pl/product/22726306/m5stack-m5stamp-c3u-mate-with-pin-headers 2023-03-07 https://elecena.pl/product/22726306/m5stack-m5stamp-c3u-mate-with-pin-headers 2023-12-27 https://elecena.pl/product/22726306/m5stack-m5stamp-c3u-mate-with-pin-headers 2024-09-18 https://elecena.pl/product/22726306/m5stack-m5stamp-c3u-mate-with-pin-headers 2024-11-29 https://elecena.pl/product/22726306/m5stack-m5stamp-c3u-mate-with-pin-headers 2024-11-30 https://elecena.pl/product/22726306/m5stack-m5stamp-c3u-mate-with-pin-headers 2025-04-29 https://elecena.pl/product/22726306/m5stack-m5stamp-c3u-mate-with-pin-headers 2025-11-28 https://elecena.pl/product/22726306/m5stack-m5stamp-c3u-mate-with-pin-headers 2025-11-29