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When this pin is low all pins are enabled
This enables the use of current limiting resistors to interface inputs to voltages in excess of VCC
Colour: Purple
Outer diameter 18mm
SRAM: 2KB
Arduino Uno Rev3 SMD W1209 When this pin is lowIntroduction : The Uno R3 SMD is an Uno compatible version of the latest R3 iteration of the Arduino Uno, which is the most popular of the many development boards available for hobbyists. It uses an SMD version of the microprocessor rather than the older style DIP package used on the original product and has some additional features. Package Includes: Uno R3 SMD (Arduino compatible) 1 x 40 break away male header strip Key Features of UNO R3 SMD: