M5Stack Stopwatch Dev Kit (ESP32-S3) is a portable round development board built for interactive embedded projects, compact smart devices, and lightweight IoT terminals. Based on the official M5Stack product information, it combines an ESP32-S3R8 controller with 16MB Flash, 8MB PSRAM, a 1.75-inch AMOLED round touch display, onboard audio, motion sensing, RTC, and battery-powered operation in a compact handheld form factor. This kit is positioned for projects that need a more expressive local interface than a basic controller board. The integrated touch display, programmable buttons, vibration feedback, microphone, speaker path, IMU, and expansion interfaces make it suitable for wearable-style interaction, portable control panels, smart badges, and custom user-interface prototypes. Features ESP32-S3R8 dual-core controller up to 240MHz 16MB Flash and 8MB PSRAM for richer embedded applications 1.75-inch AMOLED round touch display with 466 x 466 resolution 2.4GHz Wi-Fi connectivity for wireless projects Two programmable buttons plus a dedicated power button Built-in vibration motor for haptic feedback Integrated audio path with ES8311 codec, MEMS microphone, and AW8737A amplifier BMI270 IMU and RX8130CE RTC for sensing and timekeeping HY2.0-4P interface and rear expansion bus for hardware expansion Built-in 450mAh battery with M5PM1 power management Specifications Specification Parameter SoC ESP32-S3R8 dual-core Xtensa LX7, up to 240MHz Flash 16MB PSRAM 8MB Wireless 2.4GHz Wi-Fi Display 1.75" AMOLED round touch display, 466x466 resolution, CO5300 driver chip, QSPI interface Touch CST820B driver chip Buttons 2 x programmable buttons + 1 x power button Vibration Feedback Built-in vibration motor Audio Codec ES8311 Microphone MEMS MIC Audio Amplifier AW8737A IMU BMI270 RTC RX8130CE Expansion Interface HY2.0-4P Rear Expansion Bus 2.54-7P, 2.54-6P Body Structure Lanyard hole Power Management M5PM1 multi-level power management Battery Capacity 450mAh Input Power USB Type-C DC 5V Product Size 52.0 x 52.0 x 15.5mm Product Weight 39.0g Package Size 70.0 x 70.0 x 23.6mm Gross Weight 49.5g Applications Portable smart devices Interactive embedded prototypes Electronic badges and wearable-style interfaces Lightweight IoT terminals Custom touch-based control panels Packing List 1 x StopWatch Notes Official specifications are used where available. This product is best suited for interface-driven and portable ESP32-S3 projects rather than minimal headless control nodes. Resources Official M5Stack documentation Want to learn how to build interactive IoT projects with this round AMOLED screen? Read our complete M5Stack StopWatch Hands-on Guide & Review.
