

A000066 original Arduino UNO Microcontroller Board Based on the ATMEGA328
The Arduino Uno is a microcontroller board based on the Atmega328. It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, a 16 MHz crystal oscillator, a USB connection, a power jack, an ICSP header, and a reset button. It contains everything needed to support the microcontroller; simply connect it to a computer with a USB cable or power it with a AC-to-DC adapter or battery to get started.
Reference: ARDUNOR3SMD
Brand: Hytronic
the Uno R3 SMD is a budget alternative to the Arduino Uno Boards. It is equipped with an ATMEL AVR ATmega328P microcontroller and a updated USB-controller for cost reduction. The specifications are equal to Arduino Uno R3.
Reference: ARDREEDSWITCH
Brand: Hytronic
Standard MINI Reed Switch Module KY-021
A000066 original Arduino UNO Microcontroller Board Based on the ATMEGA328