Arduino UNO (SMD) 47pf 50V 0805 SMD Capacitor (Pack of 4000) Exposed solderable ground pad below

Exposed solderable ground pad below the driver IC on the bottom of the PCB

These are Metal Film Resistor with a value of 8

Model SS24 Max

5uF/1500nF  Rated Voltage 250V Tolerance ±5% Mounting Type Through Hole Type Polyester Film Capacitor

Durable Connector

Arduino UNO (SMD) 47pf 50V 0805 SMD Capacitor (Pack of 4000) Exposed solderable ground pad belowArduino Uno is a microcontroller board based on the ATmega328P. It has 14 digital input output pins, 6 Analog inputs, a 16 MHz quartz crystal, a USB connection, a power jack, an ICSP header, and a reset button. It contains everything needed to support the microcontroller that simply connects it to a computer with a USB cable or power it with an AC to DC adapter or battery to get started. The Arduino Uno is the successor to the Arduino Duemilanove