M5Stack Core StopWatch is an ESP32-S3-powered WiFi and Bluetooth development board with a 1.75-inch round AMOLED touch display, 16MB flash, and 8MB PSRAM designed for portable IoT devices, electronic badges, and wearables.
The device also features a 1W speaker and a MEMS microphone for voice interaction, two programmable buttons, a vibration motor, a 6-axis IMU sensor, an RTC, and expansion capabilities through a Grove connector and GPIO headers. It’s powered by a 450 mAh battery managed by an “M5PM1 multi-level power management” solution and charged over a USB-C port.
M5Stack Core StopWatch specifications:
- SoC – Espressif ESP32-S3R8
- CPU – Dual-core Tensilica LX7 microcontroller up to 240 MHz with vector instructions for AI acceleration
- Memory – 8MB PSRAM
- Wireless – WiFi 4 and Bluetooth 5.0 LE + Mesh connectivity
- Storage – 16MB flash
- Display – 1.75-inch AMOLED round touch display with 466 x 466 resolution
- Audio
- 1W speaker
- MEMS microphone
- ES8311 audio codec
- AW8737A amplifier
- USB – 1x USB Type-C port for power and programming
- Sensors – 6-axis IMU BMI270
- Expansion
- 4-pin Grove connector
- 7-pin and 6-pin 2.54mm pitch headers for up to 10x GPIO, UART, USB 2.0, VBAT, 3.3V, and GND
- Misc –
- Power button, 2x programmable buttons
- Built-in vibration motor
- RX8130CE RTC chip
- Lanyard hole
- Rear magnetic attachment
- Power Supply
- 5V via USB-C power
- Built-in 450mAh battery
- M5PM1 multi-level power management system
- Dimensions – 52.0 Ø x 15.5mm
- Weight – 39 grams
The company provides instructions and code samples to get started with the Arduino IDE using the M5Unified and M5GFX driver libraries, as well as PlatformIO. You’ll find these along with pinout and schematics on the documentation website.
It’s not quite the first ESP32-S3 devkit with a round AMOLED touch display, and competing products include the LILYGO T-Display-S3-AMOLED-1.43 and Waveshare ESP32-S3-Touch-LCD-1.85C, but the M5Stack device integrated the display and audio support in a more compact form factor. The Waveshare model can also handle audio, but it does so via a thicker audio expansion box.
The StopWatch touch AMOLED devkit is sold for $45 on AliExpress and the M5Stack store.
Jean-Luc started CNX Software in 2010 as a part-time endeavor, before quitting his job as a software engineering manager, and starting to write daily news, and reviews full time later in 2011.
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