ATMegaZero ESP32-S2

Development Board

Code name: atmegazero_esp32s2

ESP32S2

ATMegaZero ESP32-S2 is a development board based on the ESP32S2 microcontroller using XTENSA architecture.

This board features a maximum CPU frequency of 240 MHz and 16MB flash memory.

About ATMegaZero ESP32-S2

Raspberry Pi Zero–style ESP32-S2 board - ideal for Linux-style form factor with secure IoT power.

Technical Specifications

Complete technical specification details for ATMegaZero ESP32-S2

Connectivity

WiFi 802.11 b/g/n 2.4 GHz

Bluetooth -

BLE -

Microcontroller

Model esp32s2

Clock Speed 240 MHz

Flash Size 16MB

Architecture xtensa

✨ Features & Pins

Digital IO 48

Analog Input 20

PWM 23

Interrupts 46

Quick Setup

Copy-paste configs for ATMegaZero ESP32-S2 - auto‑generated from this board's exact hardware specs.

ESP32S2 240 MHz 16MB QIO Xtensa

In Arduino IDE 2 select Atmegazero Esp32s2 from the esp32 by Espressif package. In PlatformIO use board = esp32-s2-saola-1. ESP32S2 · 240 MHz · 16MB · QIO.

Tools menu settings

Board (select in Arduino IDE) Atmegazero Esp32s2

CPU Frequency 240 MHz

Flash Size 16MB

Flash Mode QIO

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 "Atmegazero Esp32s2" for the ATMegaZero ESP32-S2.

platformio.ini


[env:atmegazero_esp32s2]
platform  = espressif32
board     = esp32-s2-saola-1
framework = arduino

; Exact hardware config for ATMegaZero ESP32-S2
board_build.mcu        = esp32s2
board_build.f_cpu      = 240000000L
board_build.flash_size = 16MB
board_build.flash_mode = qio
board_upload.flash_size = 16MB

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

esp32: block (YAML)


esp32:
  board: esp32-s2-saola-1
  framework:
    type: arduino   # or "esp-idf"

# ATMegaZero ESP32-S2 - 240 MHz ESP32S2
# Flash: 16MB | USB: N/A

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

esptool.py - flash command


esptool.py \
  --chip esp32s2 \
  --baud 921600 \
  write_flash \
    --flash_mode qio \
    --flash_size 16MB \
    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 ATMegaZero ESP32-S2

ESP32S2 Datasheet

Microcontroller reference

Pin Mappings

Complete pinout and GPIO mapping for ATMegaZero ESP32-S2

Digital I/O Pins

Interrupt Pins

Analog Inputs

PWM Pins

Pin	Analog	Touch	PWM	Other
0
1		T1	PWM
2		T2	PWM
3	A5	T3	PWM
4		T4	PWM
5		T5	PWM
6	A4	T6	PWM
7		T7	PWM
8		T8	PWM	SDA
9		T9	PWM	SCL
10		T10	PWM
11		T11	PWM
12	A3	T12	PWM
13	A2	T13	PWM
14		T14	PWM
17	A0		PWM	DAC1
18	A1		PWM	DAC2
35			PWM	MOSI
36			PWM	SCK
37			PWM	MISO
38			PWM	SS
40			PWM	NEOPIXEL
43			PWM	TX
44			PWM	RX

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 ATMegaZero ESP32-S2

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