Watchy

Development Board

Code name: WATCHY

ESP32

Watchy is a development board based on the ESP32 microcontroller using XTENSA architecture.

This board features a maximum CPU frequency of 240 MHz and 4MB flash memory.

About Watchy

Open-source ESP32 smartwatch with e-paper display - ideal for wearable development, clocks, and DIY wrist apps.

Technical Specifications

Complete technical specification details for Watchy

Connectivity

WiFi 802.11 b/g/n (2.4 GHz)

Bluetooth 4.2

BLE 4.2

Microcontroller

Model esp32

Clock Speed 240 MHz

Flash Size 4MB

Architecture xtensa

✨ Features & Pins

Digital IO 40

Analog Input 16

PWM 17

Interrupts 16

Quick Setup

Copy-paste configs for Watchy - auto‑generated from this board's exact hardware specs.

ESP32 240 MHz 4MB DIO Xtensa

In Arduino IDE 2 select Watchy from the esp32 by Espressif package. In PlatformIO use board = esp32dev. ESP32 · 240 MHz · 4MB · DIO.

Tools menu settings

Board (select in Arduino IDE) Watchy

CPU Frequency 240 MHz

Flash Size 4MB

Flash Mode DIO

Upload Speed 921600

Architecture Xtensa

In Arduino IDE 2, open Boards Manager, search "esp32" by Espressif and install it. Then go to Tools → Board and select "Watchy" for the Watchy.

platformio.ini


[env:watchy]
platform  = espressif32
board     = esp32dev
framework = arduino

; Exact hardware config for Watchy
board_build.mcu        = esp32
board_build.f_cpu      = 240000000L
board_build.flash_size = 4MB
board_build.flash_mode = dio
board_upload.flash_size = 4MB

The board value is a close generic match - check PlatformIO board registry for an exact fit.

esp32: block (YAML)


esp32:
  board: esp32dev
  framework:
    type: arduino   # or "esp-idf"

# Watchy - 240 MHz ESP32
# Flash: 4MB | USB: N/A

Paste into your device's .yaml. See ESPHome ESP32 docs for full options.

esptool.py - flash command


esptool.py \
  --chip esp32 \
  --baud 921600 \
  write_flash \
    --flash_mode dio \
    --flash_size 4MB \
    0x1000 bootloader.bin \
    0x8000    partitions.bin \
    0xe000    boot_app0.bin \
    0x10000   firmware.bin

Install: pip install esptool - replace firmware.bin with your binary - bootloader at 0x1000

Useful Links

Datasheets and resources for Watchy

ESP32 Datasheet

Microcontroller reference

Pin Mappings

Complete pinout and GPIO mapping for Watchy

Digital I/O Pins

Interrupt Pins

Analog Inputs

PWM Pins

Pin	PWM	Other
1	PWM	TX
3	PWM	RX
4	PWM	DOWN_BTN_PIN
5	PWM	SS DISPLAY_CS
9	PWM	DISPLAY_RES
10	PWM	DISPLAY_DC
12	PWM	ACC_INT_2_PIN
13	PWM	VIB_MOTOR_PIN
14	PWM	ACC_INT_1_PIN
18	PWM	SCK
19	PWM	MISO DISPLAY_BUSY
21	PWM	SDA
22	PWM	SCL
23	PWM	MOSI
25	PWM	BACK_BTN_PIN
26	PWM	MENU_BTN_PIN
27	PWM	RTC_INT_PIN

Legend

A0 Analog input

T0 Touch sensor

PWM PWM capable

RX/TX Serial pins

LED Built-in LED

# Pin number

Default Tools & Configuration

Build and upload settings for Watchy

Setting	Value
Bootloader tool	esptool_py
Uploader tool	esptool_py
Network uploader tool	esp_ota
Bootloader address	`0x1000`
Flash mode	dio
Boot mode	qio
Maximum upload size	1280 KB (1310720 bytes)
Maximum data size	320 KB (327680 bytes)