M5Stack Stopwatch Dev Kit (ESP32-S3)

The M5Stack StopWatch combines a round AMOLED touchscreen, wireless connectivity, motion sensing, audio features, and battery power in a compact handheld device, making it ideal for portable controls, wearable interfaces, and interactive IoT projects.

The M5Stack StopWatch is a round AMOLED touch development board designed for portable and interactive scenarios.

It features an ESP32-S3R8 main controller with 16MB Flash and 8MB PSRAM, and supports 2.4GHz Wi-Fi wireless communication. The device integrates a 1.75" AMOLED round touch display, programmable buttons, and vibration feedback to provide an intuitive human-machine interaction experience. It also provides audio input/output, IMU attitude sensing, RTC timekeeping, and multiple expansion interfaces.

Together with the M5PM1 multi-level power management system and a 450mAh battery, it can meet diverse development needs such as portable smart control, wearable human-machine interaction, and lightweight IoT terminals.

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Features

• ESP32-S3R8 core controller:
  • 16MB Flash + 8MB PSRAM
  • 2.4GHz Wi-Fi
• Interactive experience:
  • 1.75" AMOLED round touch display
  • 2 x programmable buttons, 1 x power button
  • Built-in vibration motor
  • 6-axis IMU BMI270
• Audio system:
  • ES8311 Audio Codec
  • MEMS MIC
  • AW8737A amplifier
• RTC clock chip RX8130CE
• Expansion capability:
  • HY2.0-4P expansion interface
  • Rear expansion bus (2.54-7P, 2.54-6P)
  • Lanyard hole design
  • Rear magnetic attachment design
• Power system:
  • M5PM1 multi-level power management system
  • Built-in 450mAh battery
  • Balances battery life and low-power operation

Specifications

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

Resources

• Documents

Package Contents

• 1x M5Stack Stopwatch Dev Kit (ESP32-S3)