SEVEN SEGMENT LED TYPES AND PIN CONFIG

The seven segment displays are one of the oldest & efficient types of display used in electronics applications. These displays have 8 LEDs inside it arranged in a manner. These 8 LEDs are separated into each segment which can be named as a, b, c, d, e, f, g, DP (decimal point) as shown in the picture below.

These entire 8 LEDs have one end of their pins pulled out of the module as shown below and the other ends are connected together and pulled out as the Common pin. So to make patterns like numbers (0 – 9) or alphabets we just need to power common along with the other segment pin, see in the diagram below.

The eighth segment (using the DP pin) allows us to show a decimal point.

seven segment pinout
Seven Segment PinOut

7 SEGMENTs DISPLAY PIN-CONFIGURATION

PIN NUMBERPIN NAMEDESCRIPTION
1EControls the left bottom LED of the 7-segment display
2DControls the bottom most LED of the 7-segment display
3COMConnected to Ground/VCC based on type of display
4CControls the right bottom LED of the 7-segment display
5DPControls the decimal point LED of the 7-segment display
6BControls the top right LED of the 7-segment display
7AControls the top most LED of the 7-segment display
8COMConnected to Ground/VCC based on type of display
9FControls the top left LED of the 7-segment display
10GControls the middle LED of the 7-segment display
7 Segment display
OUTPUT on 7 Segment Display

SELECTING YOUR 7-SEGMENT DISPLAY

7 Segment is either a Common Anode display or a Common Cathode display. Circuit/program designed for Common Anode display cannot be used for Common Cathode or vice versa.

COMMON CATHODE (CC) 7 SEGMENT DISPLAY

The common cathode display is also known as CC display. In this type, the cathode pins of all eight segments/LEDs are connected (short-circuited) together. So In order to make this type of display work, we should connect the Com pin to the Ground pin and need to power the other pins with Vcc (+5V typically).

Common Cathode Seven Segment

COMMON ANODE (CA) 7 SEGMENT DISPLAY

The common anode display is also known as CA display. In this type, anode pins of all eight segments/LEDs are connected (short-circuited) together. So In order to make this type of 7-segment display work, we should connect the Com pin to the Vcc (+5V typically) and need to ground the required segment pin to turn it on (in simple words give a LOW signal from the Arduino pin to any segment of LED you want to turn it on and +5V to com pin).

Common Anode Seven Segment

 


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HOW TO USE 7-SEGMENT DISPLAY


 

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