Arduino

Here's some info about Arduino boards. I have other information about microcontrollers.

Arduino

This is a broad view of what's available from Arduino.

Arduino Board	MCU	MCU Family
Arduino Mega 2560	ATmega2560	8-bit AVR
Arduino Leonardo	ATmega32u4	8-bit AVR
Arduino Micro	ATmega32u4	8-bit AVR
Arduino Uno	ATmega328P	8-bit AVR
Arduino Nano	ATmega328	8-bit AVR
Arduino Pro Mini	ATmega328P	8-bit AVR
Arduino Due	Atmel SAM3X8E	32-bit ARM Cortex-M3
Arduino Zero	ATSAMD21G18	32-bit ARM Cortex-M0+
Arduino MKR1000	ATSAMD21 Cortex-M0+	32-bit ARM Cortex-M0+
Arduino Nano 33 IoT	ATSAMD21 Cortex-M0+	32-bit ARM Cortex-M0+
Arduino Yún	ATmega32u4 + Atheros AR9331	8-bit AVR + Linux SOC
Arduino 101	Intel Curie	32-bit Quark SE

8-bit AVR

These are the 8-bit AVR based Arduinos that I own along with some of their vital statistics. Conspicuously absent here is the legacy Arduino Pro Mini and the Arduino Yún which I don't own (yet).

8-bit AVR table

This table shows which MCU the various boards use with links to more info.

Arduino Model	MCU	AliExpress
Arduino Mega 2560	ATmega2560	AliExpress
Arduino Leonardo	ATmega32u4	AliExpress
Arduino Micro	ATmega32u4	AliExpress
Arduino Uno	ATmega328P	AliExpress
Arduino Nano	ATmega328	AliExpress

8-bit AVR feature matrix

This feature matrix helps to compare the Arduino boards I own.

	Arduino Mega 2560	Arduino Leonardo	Arduino Micro	Arduino Uno	Arduino Nano
AVR	ATmega2560	ATmega32u4	ATmega32u4	ATmega328P	ATmega328
Core Architecture	AVR 8-bit RISC	AVR 8-bit RISC	AVR 8-bit RISC	AVR 8-bit RISC	AVR 8-bit RISC
SRAM	8 KB	2.5 KB	2.5 KB	2 KB	2 KB
Flash Memory	256 KB	32 KB	32 KB	32 KB	32 KB
EEPROM	4 KB	1 KB	1 KB	1 KB	1 KB
Maximum Clock Speed	16 MHz	16 MHz	16 MHz	16 MHz	16 MHz
Built-in LED Pin	13	13	13	13	13
Digital I/O Pins	54	20	20	14	14
Analog input pins	16	12	12	6	8
PWM pins	15	7	7	6	6
USB Compatibility	FTDI or CH340	built-in	built-in	FTDI or CH340	FTDI or CH340
UART	4	1	1	1	1
SPI	Yes	Yes	Yes	Yes	Yes
I2C	Yes	Yes	Yes	Yes	Yes
Power Consumption	Standard	Standard	Standard	picoPower	Standard
I/O Voltage	5V	5V	5V	5V	5V
Input voltage (nominal)	7-12V	7-12V	7-12V	7-12V	7-12V
DC Current per I/O Pin	20 mA	10 mA	10 mA	20 mA	20 mA
Supported battery	9V battery
Power Supply Connector	Barrel Plug	Barrel Plug		Barrel Plug
Weight	37 g	20 g	13 g	25 g	7 g
Width	53.3 mm	53.3 mm	18 mm	53.4 mm	18 mm
Length	101.5 mm	68.6 mm	48 mm	68.6 mm	45 mm