StopWatch

SKU:C152

Description

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, supporting 2.4GHz Wi-Fi wireless communication. The device integrates a 1.75" AMOLED touch round screen, programmable buttons, and vibration feedback for an intuitive human-machine interaction experience. It also features audio input/output, IMU attitude sensing, RTC timekeeping, and multiple expansion interfaces. Combined with the M5PM1 multi-level power management system and a 450mAh battery, it meets diverse development needs including portable smart control, wearable human-machine interaction, and lightweight IoT terminals.

Note

Tutorial

UiFlow2

UiFlow2

This tutorial introduces how to control the StopWatch device through the UiFlow2 graphical programming platform.

Arduino IDE

Arduino IDE

This tutorial explains how to program and control the StopWatch device using Arduino IDE.

Xiaozhi Voice Assistant

Xiaozhi Voice Assistant

This tutorial covers flashing the Xiaozhi Voice Assistant firmware onto StopWatch via M5Burner to build a personal voice assistant application.

Factory Firmware Usage Tutorial

Factory Firmware Usage Tutorial

This tutorial covers the factory firmware usage for StopWatch, including button operations and feature descriptions.

Features

• ESP32-S3R8 Core Controller:
  • 16MB Flash + 8MB PSRAM
  • 2.4GHz Wi-Fi
• Interactive Experience:
  • 1.75" AMOLED Touch Round Screen
  • 2 x Programmable Buttons, 1 x Power Button
  • Built-in Vibration Motor
  • 6-axis IMU BMI270
• Audio System:
  • ES8311 Audio Codec
  • MEMS MIC
  • AW8737A Speaker Amplifier + 1W @ 8Ω Speaker
• 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
  • Balanced Battery Life and Low Power Operation

Includes

• 1 x StopWatch

Applications

• Portable Smart Devices
• Electronic Badges
• Lightweight IoT Terminals

Specification

Learn

Power On/Off

• Power On / Reset: Short press the power button once
• Power Off: Press the power button twice quickly

Enter Download Mode

• Connect the device to your computer via a USB Type-C cable, press and hold the power button (about 2 seconds) until the green LED lights up, then release. The device is now in download mode, ready for flashing.

Schematics

• StopWatch Schematics PDF

1/4

PinMap

AMOLED

The display reset is controlled via PYG5 (PYB_OLED_RST) of the M5IOE1 expansion chip.

Touch

The touch reset is controlled via PYG4 (PYB_TP_RST) of the M5IOE1 expansion chip.

Audio

The speaker amplifier (AW8737A) enable is controlled via PYG10(PYB_SPK_EN) of the M5IOE1 expansion chip, and the Audio L3B level power supply for audio peripherals is controlled via PYG3(PYB_AU_EN).

KEY

IMU & RTC

HY2.0-4P

EXT 2.54 Bus

The MUX_IO_1, MUX_IO_2 pin switching between USB / UART functions is controlled via PYG1(PYB_MUX_CTR) of the M5IOE1 expansion chip. The default function is UART.

M5PM1

• PYG0(RTC_INT & IMU_INT): Interrupt wake-up signal
• PYG2(CHG_STAT): Charging status
• PMG4(PORT_INT): External power wake-up signal
• PYG1(G12_PY_IRQ): Interrupt signal connected to ESP32-S3
• PMG3_CHG_PROG: Charging current control

M5IOE1

• PYG1(PYB_MUX_CTR): Rear expansion interface MUX_IO_1/2 switching between USB / UART functions
• PYG3(PYB_AU_EN): ES8311 power supply + MIC power supply
• PYG9(PYB_MT_PWM): Vibration motor PWM signal
• PYG8(PYB_L3B_EN): AMOLED screen power supply
• PYG10(PYB_SPK_EN): AW8737A speaker amplifier enable
• PYG4(PYB_TP_RST): Touch screen reset
• PYG5(PYB_OLED_RST): Display screen reset

Model Size

• StopWatch Model Size PDF

Structure

• StopWatch Structure Files

Datasheets

• ESP32-S3
• ES8311
• RX8130CE Datasheet

Softwares

Quick Start

• StopWatch Xiaozhi Voice Assistant

Arduino

• StopWatch Arduino Quick Start
• StopWatch M5PM1 & M5IOE1 Power Management
• M5PM1 Arduino Library
• M5IOE1 Arduino Library
• StopWatch Arduino M5Unified Driver Library
• StopWatch Arduino M5GFX Driver Library

UiFlow2

• StopWatch UiFlow2 Quick Start

Protocol

• M5PM1 Power Management Chip
• M5IOE1 IO Expansion Management Chip

ESP-IDF

• StopWatch Factory Firmware

PlatformIO

[env:m5stack-stopwatch]
platform = espressif32 @ 6.12.0
board = esp32s3box
framework = arduino
board_build.partitions = default_16MB.csv
board_upload.flash_size = 16MB
board_upload.maximum_size = 16777216
board_build.arduino.memory_type = qio_opi
monitor_speed = 115200
build_flags =
    -DESP32S3
    -DBOARD_HAS_PSRAM
    -DCORE_DEBUG_LEVEL=5
    -DARDUINO_USB_CDC_ON_BOOT=1
    -DARDUINO_USB_MODE=1
lib_deps =
    M5Unified = https://github.com/m5stack/M5Unified
    M5GFX = https://github.com/m5stack/M5GFX
    M5PM1 = https://github.com/m5stack/M5PM1
    M5IOE1 = https://github.com/m5stack/M5IOE1

Easyloader

Other

• StopWatch Factory Firmware Usage Tutorial
• StopWatch Factory Firmware Flashing Tutorial

Video