Arduino Comparison Guide
Uno or Pro Mini? Bluetooth or wireless? When it comes to Arduinos, there are a lot of choices. We've compiled every Arduino development board we carry, so you can quickly compare them to find the perfect one for your needs.
If you're not quite to the spec sheet stage yet, head over to our Choosing an Arduino for Your Project guide.
Arduino Uno - R3
Quick take: Having the microcontroller in a larger DIP package means it can be removed or replaced easily.
Processor:
ATmega328P
Clock Speed:
16 MHz
Flash Memory:
32KB
RAM:
2KB
Operating Voltage
5 V
GPIO
20
Analog Inputs
6
DAC
0
PWM
6
UART
1
SPI
1
I2C
1
Connector
USB Type B
USB-to-Serial
ATmega16U2
LiPo Charger
No
Soldered Headers?
Yes
Shield Compatible
Yes
Form Factor
2.7 x 2.1 in. rectangle
Arduino Uno - R3 SMD
Quick take: Microcontroller is in SMD package, which makes it harder to remove or replace.
Processor:
ATmega328P
Clock Speed:
16 MHz
Flash Memory:
32KB
RAM:
2KB
Operating Voltage
5 V
GPIO
20
Analog Inputs
6
DAC
0
PWM
6
UART
1
SPI
1
I2C
1
Connector
USB Type B
USB-to-Serial
ATmega16U2
LiPo Charger
No
Soldered Headers?
Yes
Shield Compatible
Yes
Form Factor
2.7 x 2.1 in. rectangle
SparkFun RedBoard Plus
Quick take: We've applied every lesson we've learned about making a better Arduino Uno and put it into the RedBoard Plus
Processor:
ATmega328P
Clock Speed:
16 MHz
Flash Memory:
32KB
RAM:
2KB
Operating Voltage
3.3V or 5V (selectable)
GPIO
20
Analog Inputs
8
DAC
0
PWM
6
UART
1
SPI
1
I2C
1
Connector
USB-C
USB-to-Serial
USB-C CH340G
LiPo Charger
No
Soldered Headers?
Yes
Shield Compatible
Yes
Form Factor
2.7 x 2.1 in. rectangle
SparkFun RedBoard
Quick take: Like the UNO R3, but cheaper and uses an FTDI, which means different USB drivers.
Processor:
ATmega328P
Clock Speed:
16 MHz
Flash Memory:
32KB
RAM:
2KB
Operating Voltage
5 V
GPIO
20
Analog Inputs
6
DAC
0
PWM
6
UART
1
SPI
1
I2C
1
Connector
USB Mini-B
USB-to-Serial
FTDI FT231X
LiPo Charger
No
Soldered Headers?
Yes
Shield Compatible
Yes
Form Factor
2.7 x 2.1 in. rectangle
SparkFun RedBoard Qwiic
Quick take: Just like our trusty RedBoard featuring a Qwiic connector among other new features.
Processor:
ATmega328P
Clock Speed:
16 MHz
Flash Memory:
32KB
RAM:
2KB
Operating Voltage
3.3V or 5V via jumpers
GPIO
20
Analog Inputs
6
DAC
0
PWM
6
UART
1
SPI
1
I2C
Connector
Micro USB
USB-to-Serial
CH340C
LiPo Charger
No
Soldered Headers?
Yes
Shield Compatible
Yes
Form Factor
2.7 x 2.1 in. rectangle
SparkFun Qwiic Pro Micro - USB-C (ATmega32U4)
Quick take: Our same trusty Pro Micro now with reset button, Qwiic connector, USB-C, and castellated pads and more!
Processor:
ATmega32U4
Clock Speed:
16 MHz
Flash Memory:
32KB
RAM:
2.5 KB
Operating Voltage
3.3V regulated
GPIO
18
Analog Inputs
8
DAC
0
PWM
5
UART
1
SPI
1
I2C
1 via Qwiic Connector
Connector
USB C
USB-to-Serial
Native USB
LiPo Charger
No
Soldered Headers?
No
Shield Compatible
No
Form Factor
1.3 x 0.7 in rectangle
Arduino Pro Mini - 5V/16MHz
Quick take: Very popular bare-bones, small Arduino board with 5V I/O. Separate USB-to-Serial board/cable is required for programming.
Processor:
ATmega328P
Clock Speed:
16 MHz
Flash Memory:
32KB
RAM:
2 KB
Operating Voltage
5 V
GPIO
22
Analog Inputs
8
DAC
0
PWM
6
UART
1
SPI
1
I2C
1
Connector
6-pin UART
USB-to-Serial
None
LiPo Charger
No
Soldered Headers?
No
Shield Compatible
No
Form Factor
1.3 x 0.7 in rectangle
Arduino Pro Mini - 3V/8MHz
Quick take: Very popular bare-bones, small Arduino board with 3.3V I/O. Separate USB-to-Serial board/cable is required for programming.
Processor:
ATmega328P
Clock Speed:
8 MHz
Flash Memory:
32KB
RAM:
2 KB
Operating Voltage
3.3 V
GPIO
22
Analog Inputs
8
DAC
0
PWM
6
UART
1
SPI
1
I2C
1
Connector
6-pin UART
USB-to-Serial
None
LiPo Charger
No
Soldered Headers?
No
Shield Compatible
No
Form Factor
1.3 x 0.7 in rectangle
Arduino Mega 2560 R3
Quick take: Good for when you need lots of GPIO pins, more than one UART port, or more memory for your program.
Processor:
ATmega2560
Clock Speed:
16 MHz
Flash Memory:
256 KB
RAM:
8 KB
Operating Voltage
5 V
GPIO
54
Analog Inputs
16
DAC
0
PWM
15
UART
4
SPI
1
I2C
1
Connector
USB Type B
USB-to-Serial
ATmega16U2
LiPo Charger
No
Soldered Headers?
Yes
Shield Compatible
Yes
Form Factor
4.0 x 2.1 in rectangle
Pro Micro - 5V/16MHz
Quick take: Small form-factor board that can act as a USB mouse or keyboard, which is fun for making custom computer peripherals.
Processor:
ATmega32U4
Clock Speed:
16 MHz
Flash Memory:
32 KB
RAM:
2.5 KB
Operating Voltage
5 V
GPIO
18
Analog Inputs
9
DAC
0
PWM
5
UART
1
SPI
1
I2C
1
Connector
USB Micro-B
USB-to-Serial
Native USB
LiPo Charger
No
Soldered Headers?
No
Shield Compatible
No
Form Factor
1.3 x 0.7 in rectangle
Special Features
USB Client
Pro Micro - 3.3V/8MHz
Quick take: Small form-factor board that can act as a USB mouse or keyboard, which is fun for making custom computer peripherals.
Processor:
ATmega32U4
Clock Speed:
8 MHz
Flash Memory:
32 KB
RAM:
2.5 KB
Operating Voltage
3.3 V
GPIO
18
Analog Inputs
9
DAC
0
PWM
5
UART
1
SPI
1
I2C
1
Connector
USB Micro-B
USB-to-Serial
Native USB
LiPo Charger
No
Soldered Headers?
No
Shield Compatible
No
Form Factor
1.3 x 0.7 in rectangle
Special Features
USB Client
SparkFun MicroView
Quick take: Tiny module with built-in display that's great for creating simple user interfaces.
Processor:
ATmega328P
Clock Speed:
16 MHz
Flash Memory:
32 KB
RAM:
2 KB
Operating Voltage
5 V
GPIO
12
Analog Inputs
6
DAC
0
PWM
3
UART
1
SPI
0
I2C
1
Connector
MicroView USB Programmer
USB-to-Serial
None
LiPo Charger
No
Soldered Headers?
Yes
Shield Compatible
No
Form Factor
—
Special Features
64 x 48 OLED display
Arduino Fio
Quick take: Similar to the Pro Mini but with a battery charger and XBee socket. Separate USB-to-Serial board/cable is required for programming.
Processor:
ATmega328P
Clock Speed:
8 MHz
Flash Memory:
32 KB
RAM:
2 KB
Operating Voltage
3.3 V
GPIO
22
Analog Inputs
8
DAC
0
PWM
6
UART
1
SPI
1
I2C
1
Connector
6-pin UART
USB-to-Serial
None
LiPo Charger
Yes
Soldered Headers?
No
Shield Compatible
No
Form Factor
2.55 x 1.1 in. rectangle
Special Features
XBee Socket
Arduino Pro 328 - 5V/16MHz
Quick take: Bare-bones Arduino board with 5V/I/O. Separate USB-to-Serial board/cable is required for programming.
Processor:
ATmega328P
Clock Speed:
16 MHz
Flash Memory:
32 KB
RAM:
2 KB
Operating Voltage
5 V
GPIO
20
Analog Inputs
6
DAC
0
PWM
6
UART
1
SPI
1
I2C
1
Connector
6-pin UART
USB-to-Serial
None
LiPo Charger
No
Soldered Headers?
No
Shield Compatible
Yes
Form Factor
2.05 x 2.10 in. rectangle
Special Features
USB client
Arduino Pro 328 - 3.3V/8MHz
Quick take: Bare-bones Arduino board with 3.3V/I/O. Separate USB-to-Serial board/cable is required for programming.
Processor:
ATmega328P
Clock Speed:
8 MHz
Flash Memory:
32 KB
RAM:
2 KB
Operating Voltage
3.3 V
GPIO
20
Analog Inputs
6
DAC
0
PWM
6
UART
1
SPI
1
I2C
1
Connector
6-pin UART
USB-to-Serial
None
LiPo Charger
No
Soldered Headers?
No
Shield Compatible
Yes
Form Factor
2.05 x 2.10 in. rectangle
Special Features
USB client
Qduino Mini
Quick take: Similar to the Pro Micro but with a battery charger and some multi-color LEDs.
Processor:
ATmega32U4
Clock Speed:
8 MHz
Flash Memory:
32 KB
RAM:
2.5 KB
Operating Voltage
3.3 V
GPIO
19
Analog Inputs
11
DAC
0
PWM
4
UART
1
SPI
1
I2C
1
Connector
USB Micro-B
USB-to-Serial
Native USB
LiPo Charger
Yes
Soldered Headers?
No
Shield Compatible
No
Form Factor
1.5 x 0.8 in. rectangle
ATmega328 with Arduino Optiboot (Uno)
Quick take: Requires external crystal and USB-to-Serial board/cable to program. Can be used as a replacement for the microcontroller on the Arduino UNO R3.
Processor:
ATmega328P
Clock Speed:
16 MHz
Flash Memory:
32 KB
RAM:
2 KB
Operating Voltage
5 V
GPIO
20
Analog Inputs
6
DAC
0
PWM
6
UART
1
SPI
1
I2C
1
Connector
None
USB-to-Serial
None
LiPo Charger
No
Soldered Headers?
No
Shield Compatible
No
Form Factor
1.4 x 0.4 in. rectangle
Special Features
Bare DIP Package
Tiny AVR Programmer
Quick take: Used to program the small, low-power ATtiny85 from Arduino. Requires separate ATtiny85 to work.
Processor:
ATtiny85
Clock Speed:
8 MHz
Flash Memory:
8 KB
RAM:
0.5 KB
Operating Voltage
5 V
GPIO
6
Analog Inputs
4
DAC
0
PWM
2
UART
0
SPI
1
I2C
1
Connector
USB Type A
USB-to-Serial
ATtiny84
LiPo Charger
No
Soldered Headers?
Yes
Shield Compatible
No
Form Factor
2.95 x 0.60 in. rectangle