Arduino boards are a type of development board that allow you to build and program your own electronic projects. They consist of a microcontroller, which is a small computer on a single chip, and a variety of input and output pins that you can use to connect sensors, actuators, and other electronic components.
Arduino boards is that they are based on open-source hardware and software. Open source means that the designs, schematics, and source code of the Arduino boards are freely available for anyone to access, use, modify, and distribute. This open nature encourages collaboration, innovation, and learning within the Arduino community.
DFRduino Nano made by DFRobot is a arduino nano compatible board using the ATMega 328 microcontroller
Specifications
Microcontroller: Atmel Atmega328-20AU
Operating Voltage (logic level): 5V
Input Voltage (recommended): 7-12V
Digital I/O Pins: 14 (of which 6 provide PWM output)
Analog Input Pins: 8
DC Current per I/O Pin: 40 mA
Flash Memory: 32 KB (of which 2KB used by bootloader)
SRAM: 2 KB
EEPROM: 1 KB
Clock Speed: 16 MHz