The M5Stack Core StopWatch is a development board powered by an ESP32-S3 chip, featuring WiFi and Bluetooth connectivity, a 1.75-inch round AMOLED touch display, 16MB of flash storage, and 8MB of PSRAM. This board is designed for portable IoT devices, electronic badges, and wearables.
Equipped with a 1W speaker, a MEMS microphone for voice commands, two programmable buttons, a vibration motor, a 6-axis IMU sensor, an RTC, and expandable via a Grove connector and GPIO headers, the device offers versatile functionalities. It is powered by a 450mAh battery, managed by the “M5PM1 multi-level power management” system, and recharged through a USB-C port.
Specifications of the M5Stack Core StopWatch:
- SoC: Espressif ESP32-S3R8
- CPU: Dual-core Tensilica LX7 microcontroller, up to 240 MHz, with vector instructions for AI tasks
- Memory: 8MB PSRAM
- Connectivity: WiFi 4, Bluetooth 5.0 LE + Mesh
- Storage: 16MB flash
- Display: 1.75-inch AMOLED round touch display, 466 x 466 resolution
- Audio:
- 1W speaker
- MEMS microphone
- ES8311 audio codec
- AW8737A amplifier
- USB: USB Type-C for power and data
- Sensors: 6-axis IMU BMI270
- Expansion:
- 4-pin Grove connector
- 7-pin and 6-pin 2.54mm pitch headers for GPIO, UART, USB 2.0, VBAT, 3.3V, GND
- Miscellaneous:
- Power button, 2 programmable buttons
- Vibration motor
- RX8130CE RTC chip
- Lanyard hole
- Magnetic attachment on the back
- Power:
- 5V via USB-C
- 450mAh battery with M5PM1 power management
- Dimensions: 52.0 Ø x 15.5mm
- Weight: 39 grams
<img decoding="async" class="aligncenter size-medium wp-image-170826 lazyload" title="M5Stack Core StopWatch specifications" src="https://allyoucantech.com/wp-content/uploads/2026/05/stopwatch-esp32-s3-devkit-by-m5stack-1-75-amoled-touch-microphone-speaker-gpio-expansion.webp" alt="M5Stack Core StopWatch specifications" width="720"