M5Stack-ATOMS3

Development Board

Code name: M5Stack_ATOMS3

ESP32S3 M5STACK

M5Stack-ATOMS3 is a development board based on the ESP32S3 microcontroller using XTENSA architecture.

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

About M5Stack-ATOMS3

A compact ESP32-S3 development kit by M5Stack, suitable for rapid prototyping and IoT applications.

Technical Specifications

Complete technical specification details for M5Stack-ATOMS3

Connectivity

WiFi 802.11 b/g/n (2.4 GHz)

Bluetooth 5.0

BLE 5.0

Microcontroller

Model esp32s3

Clock Speed 240 MHz

Flash Size 4MB

Architecture xtensa

✨ Features & Pins

Digital IO 48

Analog Input 20

PWM 19

Interrupts 46

Download Full Datasheet

Quick Setup

Copy-paste configs for M5Stack-ATOMS3 - auto‑generated from this board's exact hardware specs.

ESP32S3 240 MHz 4MB DIO Xtensa

In Arduino IDE 2 select M5stack Atoms3 from the esp32 by Espressif package. In PlatformIO use board = esp32-s3-devkitm-1. ESP32S3 · 240 MHz · 4MB · DIO.

Tools menu settings

Board (select in Arduino IDE) M5stack Atoms3

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 "M5stack Atoms3" for the M5Stack-ATOMS3.

platformio.ini


[env:m5stack-atoms3]
platform  = espressif32
board     = esp32-s3-devkitm-1
framework = arduino

; Exact hardware config for M5Stack-ATOMS3
board_build.mcu        = esp32s3
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: esp32-s3-devkitc-1
  framework:
    type: arduino   # or "esp-idf"

# M5Stack-ATOMS3 - 240 MHz ESP32S3
# 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 esp32s3 \
  --baud 921600 \
  write_flash \
    --flash_mode dio \
    --flash_size 4MB \
    0x0 bootloader.bin \
    0x8000    partitions.bin \
    0xe000    boot_app0.bin \
    0x10000   firmware.bin

Install: pip install esptool - replace firmware.bin with your binary - bootloader at 0x0

M5Stack-ATOMS3 Pinout Diagram

Complete pin reference for M5Stack-ATOMS3

Useful Links

Datasheets and resources for M5Stack-ATOMS3

Board Datasheet

Technical specifications

ESP32S3 Datasheet

Microcontroller reference

Pin Mappings

Complete pinout and GPIO mapping for M5Stack-ATOMS3

Digital I/O Pins

Interrupt Pins

Analog Inputs

PWM Pins

Pin	PWM	Other
0		G0
1	PWM	TXD2 G1
2	PWM	RXD2 G2
3	PWM	G3
4	PWM	G4
5	PWM	G5
6	PWM	G6
7	PWM	G7 ADC1
8	PWM	G8 ADC2
15	PWM	SS
17	PWM	SCK
21	PWM	MOSI
36	PWM	G36
37	PWM	G37
38	PWM	SDA G38
39	PWM	SCL G39
40	PWM	G40
42	PWM	G42
43	PWM	TX
44	PWM	RX
48		LED_BUILTIN
-1		MISO

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 M5Stack-ATOMS3

Setting	Value
Bootloader tool	esptool_py
Uploader tool	esptool_py
Network uploader tool	esp_ota
Bootloader address	`0x0`
Flash mode	dio
Boot mode	qio
PSRAM type	qspi
Maximum upload size	1280 KB (1310720 bytes)
Maximum data size	320 KB (327680 bytes)