Arduino R3 is an open source hardware and software program used  for roboticists, and lighting led , motors etc .  Contains Variety of I/O pins including analog, digital, PWM and more. It is inexpensive and easy for beginners to use. It also has reset button to reset the program on chip.

Specifications:

• ATmega328 microcontroller
• Input voltage - 7-12V
• 14 Digital I/O Pins (6 PWM outputs)
• 6 Analog Inputs
• 32k Flash Memory
• 16Mhz Clock Speed

 Package Includes:

• 1 x Arduino Uno R3 board with Cable.

Arduino Due board based on a 32-bit ARM core microcontroller (AT91SAM3X8E )  that allows operations on 4 bytes wide data within a single CPU clock  including 12 digital I/O pins and 12 analog pins. It is compatible with all Arduino shields that work at 3.3V. it has a  DMA controller that can relieve the CPU from doing memory intensive task. It contains automatic reset software. We can operate its drivers from any operating software’s. It has automatic reset software with usb host facilities.

Arduino UNO R3 clone is made in china instead of Italy.There are two analog-input pins : A6 and A7 that are not found on traditional UNO boards. You will need to install a driver for your computer to recognize the on-board CH340G USB to serial converter.R3 clone has  a USB connector for easy connection to computers for programming including a power jack, an ICSP header and a reset button.
 

Arduino Pro Micro Usb is an ATmega32U4 board  running at 5V/16MHz. It is the smallest Arduino –Compatible board. It has high speed PWM with programmable and resolution from 2-11bits.it is Supported under Arduino IDE v1.0.1. it can accept voltage up to 12VDC. It has USB connectivity on-board and on board power and status LEDs.

The Arduino Ethernet Shield Clone is an Ethernet Controller Board with W5500 Ethernet Controller which allows us to connect to internet through ICSP (In-Circuit Serial Programming). This Ethernet Shield Clone Module communicates with Arduino Mega Board through SPI connection with ICSP pins. Its operating power supply is 5V which is supplied from Arduino Mega 2560. It also has an Onboard SD Card slot which helps in Read/Write operation.

The Arduino Ethernet Module is a compact Ethernet Module with the ENC28J60 Ethernet controller chip, LAN connector and SPI interface for the microcontroller, arduino, avr, pic and so on. This Arduino Ethernet Module helps us to connect our projects to the network and the internet and run a web server or web client.

This is a protective case designed specifically for the Arduino Mega. The case is a two-piece injection-molded ABS enclosure that snaps together around the Arduino Mega. Holds the Arduino Mega firmly in place.

This mini electronic product is designed for e-textiles and wearables projects. This product can be joined to fabric and also mounted power supplies, sensors, and actuators with conductive thread. It has only 9 pins for input/output. It is just a connector and a built-in charging circuit for Lithium Polymer batteries. 

Overview

• Development Board
• Micro USB
• WiFi
• Bluetooth
• Arduino Compatible

Features

• Micro USB connection
• 1 analog input(3.2V max input)
• Compatible with Arduino
• D1 R32=WiFi+bluetooth+UNO
• 4MB Flash

Specifications

• Operating voltage: DC 5V - 12V
• Length: 53.3mm
• Width: 68.3mm
• Weight: 15 g

Application

• IOT Application
• Wireless Application

Package Included

• 1 x Arduino Wifi & Bluetooth R32 Based Esp32

Arduino Mega2560  is fitted with the ATMEGA16U2 chip which is an open source program. The power source is selected automatically either  from USB connection or external power supply. The ATmega2560 has 256 KB of flash memory for storing code . It contains automatic reset software inbuilt with stronger reset circuit.

"The Arduino Mega 2560  is a open-source physical computing microcontroller board based on the ATmega2560. It includes  54 digital input/output pins where  14 can be used as PWM outputs , 16 analog inputs, 4 UARTs (hardware serial ports), a 16 MHz crystal oscillator, a USB connection, a power jack, an ICSP header,. Arduino can be used to develop stand-alone interactive objects or can be connected to software on your computer (e.g. Flash, Processing, MaxMSP)The Mega is compatible with most shields designed for the Arduino Duemilanove or Diecimila.
The Mega 2560 R3 has an automatic reset software and  also adds SDA and SCL pins next to the AREF. In addition, there are two new pins placed near the RESET pin.. The Mega 2560 R3 works with all existing shields but can adapt to new shields which use these additional pins. The open-source IDE can be downloaded for free (currently for Mac OS X, Windows, and Linux).
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The Arduino Leonardo is a microcontroller board based on the ATmega32u4 that includes  20 digital input/output pins  where  7 can be used as PWM outputs and 12 as analog inputs , a 16 MHz crystal oscillator, a micro USB connection, a power jack, an ICSP header, and a reset button.  We can simply connect it to a computer with a USB cable or power it with a AC-to-DC adapter or battery to operate . The Leonardo has built-in USB communication that eliminating the need for a secondary processor. This allows the Leonardo to appear to a connected computer as a mouse and keyboard.   The drivers are  automatically installed plugging with an USB cable to the   PC. The software  can be found  in the official site .