7-Segment Display Connection (Common Anode & Common Cathode)

Hi, in this article, we are going to see the 7-Segment Display Connection. We will learn the connection procedure for both Common Anode and Common Cathode 7-Segment Display. The seven segments in a typical 7-segment display are labeled from 'a' to 'g'. By controlling which segments are lit up, you can create the appearance of different numbers. For example, to display the number "1", you would light up only segments 'b' and 'c'. To display "8", you would light up all segments except 'e' and 'g'.

Connecting a 7-segment display involves wiring its pins correctly to a microcontroller or other electronic devices or control circuits. Here are the general steps for connecting a common cathode 7-segment display that you can follow.

Identify Pins

First of all, identify the pins of your seven-segment display. You should have pins for each segment (A to G and DP) and the common terminals.

Connect Segment Pins

Connect each segment pin (A to G and DP) to a current-limiting resistor and then to individual output pins on your microcontroller or any device you want to connect. Remember that if your device generates an Output LOW signal then you should use Common Anode Display and if if your device generates an Output HIGH signal then you should use Common Cathode Display

Connect Common Pins

Common Anode: If your display is a Common Anode Display then Connect the common anode pin of the display to the positive terminal of your power supply. 

Common Cathode: If your display is a Common Anode Display then Connect the common cathode pin of the display to the ground (GND) of your power supply.

Connect Current-Limiting Resistors

Since each segment needs a current-limiting resistor to prevent excessive current flow, connect one end of each resistor to a segment pin, and connect the other end to the output pin on your microcontroller.

Connect Decimal Point (DP) Pin

If your display has a decimal point, connect the DP pin to a current-limiting resistor and then connect to the output pin of the microcontroller or the device you use. Use this pin to control whether the decimal point is lit or not.

Multi-Digit Display Connection

For multi-digit displays(e.g.; 2-digit, 3-digit, 4-digit) you might have additional pins for selecting which digit is active. Connect these digit control pins to your device output pins. You'll need to cycle through the digits quickly to give the illusion of multiple digits being displayed simultaneously.

Remember that the connection details can vary based on whether you're using a common anode or common cathode display and the specific microcontroller you're using. Always refer to the display and microcontroller datasheets for accurate pinout information and voltage levels.

If you're new to electronics, it's a good practice to start with a simple circuit on a breadboard before making any permanent connections. This allows you to test and verify your connections before committing to soldering or more permanent setups.

Read Also: 

• 2-Digit, 3-Digit, and 4-Digit(12 Pin) 7-Segment Display Pinout
• What is SPDT Switch? Single Pole Double Throw
• What is DPDT Switch? Double Pole Double Throw
• What is Relay Switch? Circuit Diagram and Working Principle
• What is Rocker Switch? Wiring and Connection Diagram

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