LED – Light Emitting Diode

LED is very useful for electronics products. It is used as an indicator for power availability, indicator for success execution of any processes, indicator for any alarm or failure and so on. Without LED, electronics products cannot inform user for any action that need to be take and cannot inform any successful execution.

LED has variety of size and color. Red, blue, green and yellow LED is the most common. The shape also varies from square, rectangle and circular.

LED is normally being interface with microcontroller. 5 volt is required to turn on LED and normally 470 ohm resistor is required as a safety to avoid the LED blown.

LED consists of two legs. One of the legs with flag must be connected to ground and the other must be connected to 5 volt.

7-segment LED is used to show numbers. To display characters, 7-segment LED display is not enough. 16-segment LED is required for this purpose.

 

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