M5Stack-ATOM Development Board Pinout and Technical Specifications

Code name: M5Stack_ATOM

M5Stack-ATOM development board is based on esp32 microcontroller and uses xtensa architecture. This development board has a maximum CPU frequency of 240 MHz and a flash size of 4MB.

Features

40 digital IO pins
16 external interrupt pins
16 analog input pins
14 PWM pins

Connectivity

WiFi: 802.11 b/g/n (2.4 GHz)
Bluetooth: 4.2
WiFi: 4.2

Technical specs

Clock Speed	240 MHz
Flash size	4MB
Microcontroller	esp32
Architecture	xtensa

M5Stack-ATOM Pins Mapping Arduino IDE

Below you can find the M5Stack-ATOM pinout. This development board provides 40 digital IO pins, out of which 16 can be used as an external interrupt pins , 16 as analog input pins and 14 pins have Pulse-Width Modulation (PWM) .

Pin	PWM	Other
0		G0
1	PWM	TX
3	PWM	RX
9	PWM	G9
10	PWM	G10
12	PWM	G12
19	PWM	G19 SS
21	PWM	G21
22	PWM	G22 SCK
23	PWM	G23 MISO
25	PWM	G25 DAC1
26	PWM	RXD2 SDA G26 DAC2
27	PWM	G27
32	PWM	TXD2 SCL G32
33	PWM	G33 MOSI
35		ADC1
36		G36 ADC2
37		G37
39		G39

Analog - Analog input pins

Touch - Touch pins

Function - Function pins

RX / TX - Receive (RX) / Transmit (TX)

LED_BUILTIN - Built-in LED

PWM - Pulse-Width Modulation

Default Tools

Bootloader tool	esptool_py
Uploader tool	esptool_py
Network uploader tool	esp_ota
Bootloader address	0x1000
Flash mode	dio
Boot mode	dio
PSRAM type
Maximum upload size	1280 Kb (1310720 B)
Maximum data size	320 Kb (327680 B)

The M5Stack-ATOM development board by default uses esptool_py uploader tool, esp_ota network uploader tool for Over-the-air (OTA) uploads and esptool_py bootloader tool. The bootloader starts at address "0x1000". Flash mode and boot mode for M5Stack-ATOM development board by default is dio and dio respectively. When using Arduino IDE, the maximum sketch upload size is 1280 Kb (1310720 B) and maximum data size for variables is 320 Kb (327680 B).