Arduino compatible boads

It has an Atmega2560 chip running at 16Mhz with a factory loaded bootloader with 54 digital input / output pins (from which 14 can be used as PWM outputs) and 16 analog inputs, 4 UART (hardware serial ports).
The board includes a USB connector, an ICSP port, a reset button and some status LEDs. Atmega16U2 programmed as a USB-to-serial converter.
for power, simply connect it to a computer with a USB cable or power with a power adapter and DC connector.
ATmega2560 R3 REV3 16U2 Mega2560 module with USB cable features:

- Operating voltage: 5V
- Input voltage (recommended): 7-12V
- Digital I / O Pins: 54 (14 PWM outputs)
- Analog input pins 16
- DC current per Pin I / O 40 mA
- DC current per Pin 3.3V 50 mA

- It has an Atmega328P chip running at 16Mhz with a factory loaded bootloader - The Uno R3 module has all the connectors than the Arduino Uno R3 and is compatible with all Arduino shields Arduino compatible UNO R3 board features:
- Includes USB Cable - ATmega328P 16MHz chip with external quartz crystal
- Microprocessor: ATmega328
- Operating voltage: 5V
- Input voltage (recommended): 7-12V
- Input voltage (limits): 6-20V
- Clock speed: 16 MHz
- Digital I / O Pins: 14
- Analog input pins: 6
- DC current per I / O Pin: 40 mA
- DC Current per Pin 3.3V: 50 mA
- Flash32 KB of which 0.5 KB are used by the bootloader - Atmega328
- SRAM 2 KB - Atmega328

Version compatible with Arduino Nano V3.0
It has an ATMega328P chip running at 16Mhz with bootloader loaded factory.
Characteristic:
- Microcontroller: ATmega328
- Operating Voltage (logic level): 5V
- Input Voltage (recommended): 7-12V
- Digital I / O Pins: 14 (6 PWM outputs)
- Analog Inputs: 8 (A0-A7)
- DC Current per I / O pin 40 mA
- Flash memory: 32 KB (2 KB used by the bootloader)
- SRAM: 2 KB
- EEPROM: 1 KB
- Frequency Clock: 16 MHz
- USB Communication - CH340
- Dimensions: 18 mm x 44 mm

- Bootloader Pin Header Compatible 100% ARDUINO
- Pro Mini Atmega328P 5v 16Mhz
- Miniaturized compatible version of Arduino Pro Mini
- It has an Atmega328P chip running at 16Mhz with a factory-loaded bootloader. It does not include pins so we can only solder the pins that we need
Characteristic:
- ATmega328P 16MHz chip with external quartz crystal
- Auto-reset - micro switch
- Integrated 5V regulator
- FLASH 32kB memory
- SRAM 1kB memory
- EEPROM 1Kb memory
- Analog input A0-A7
- 8 PWM channels
- External interruption
- TWI / I2C, UART, SPI interfaces
- Power and status LEDs
- Dimensions: 18x33mm
- Weight: 30 grams
Useful links for Arduino />