LIGHT EMITTING DIODE Interfacing tutorial

        Light Emitting Diodes (LED) is the most commonly used electronic components, generally for display digital states. Typical uses of LED's include alarm devices, timers and confirmation of user input such as a mouse click or keystroke, events etc. LED's are very cheap and easily available in a variety of shape, size and colors.         89C51, which belongs to the family of 8051 series of micro-controllers...