This Twig-PS/2 Adapter gives your arduino/seeeduino board a PS/2 interface that you can plug a PS/2 mouse or keyboard directly, also, the PS/2 library makes your coding the PS/2 easily.
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The PS/2 connector is a 6-pin Mini-DIN connector used for connecting keyboard and mouse to a PC compatible computer system.The PS/2 designs on keyboard and mouse interfaces are electrically similar and employ the same communication protocol. Today, this connector has been replaced by USB, but as arduino/seeeduino, it is also a good choice to use the PS/2 connector as it is more convenient and cheaper when you need a mouse or keyboard.
A PS/2 connector has 6 pins as you can see from the following diagram. Pin 1 and pin 6 are not connected. Pin 3 is for ground, and pin 4 is for power. The other 2 pins are for clock and data.
By Siddardha
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