![]() Seven segments are widely used in digital clocks to display the time.Switch on the supply, you can observe that digits 0 to 9 will display continuously with some delay in the first circuit and digits from 0 to 9999 will display on 4-digit 7-segment display in the second circuit.Make sure that a to g pins of 7 segment are connected to the P2.0 to P2.6 respectively in the first circuit and to PORT0 pins in the second circuit.Give the connections as per the circuit diagram.Initially burn the program to the microcontroller.The code and the simulation files for the first circuit can be downloaded from this link: Download Project Code Code for Circuit 2 (4-Digit) First initialize all the segment hex values of the digits in an array.If you want to drive a Common Anode display, then you have to take the complement of each bit and replace the hexadecimal values in the code (which I have done in the code of the second circuit). ![]() NOTE: These values are suitable only for a Common Cathode display. The below table show you the Hex decimal values what we need to send from PORT2 to Display the digits from 0 to 9. For example if you want to display the digit 3 on seven segment then you need to glow the segments a, b, c, d and g. To display the digits on 7 segment, we need to glow different logic combinations of segments. I have used 4 NPN Transistors to drive the 4 common anodes and the transistors are controlled by the 8051.Ĭoming to the segments a to h, they are connected to PORT0 Pins of 8051. Since the 4-digit 7-Segment display used in the second circuit is of common anode type, we need to drive the LED segments through the common terminals. Common cathode 7 segment Display Circuit 2 The operating voltage of this LED’s is 2 to 3V but from controller we will get 5V so to drop the remaining voltage we have to connect a to g pins to the controller through the resistor. Here all the cathodes of LED’s are connected to the Gnd pin. Here dot is used for indicating the decimal point. Since we are using common cathode seven segment we need to send LOGIC 1 to the segments to glow.įigure shows structure of common cathode seven segments. This resistor is used to drop the voltage. In this circuit, pins a to h of the 7 segment are connected to the PORT 2 of the microcontroller and com pin is connected to the ground through the 330 ohm resistor. Here, common cathode seven segment is used to display the digits. In the second circuit, I have interfaced a 4-digit 7-Segment Display to 8051 Microcontroller and the display type is of common anode. The 7-Segment Display is of common cathode type.Ĭircuit 2: Interfacing 7 Segment Display to 8051 (4-Digit – CA) In the first circuit, I am interfacing a Single Digit 7 Segment display with 8051. Circuit Diagram Circuit 1: Interfacing 7 Segment Display to 8051 (Single Digit – CC) In the first circuit, I will interface a Common Cathode Single Digit 7 Segment Display to the 8051 Microcontroller while in the second circuit, I will interface a Common Anode type 4-Digit 7-Segment Display to the 8051 Microcontroller. ![]() Below figure shows the internal connections of seven segment Display. In common anode, seven segment display all the anodes are tied together and cathodes are left freely. ![]() In common cathode, all the cathodes of LEDs are tied together and labeled as com. Important Related Post – Water Level Indicator Project Complete Documentation Generally seven segments are two types, one is common cathode and the other is common anode. In these LEDs, 7 LEDs are used to indicate the digits 0 to 9 and single LED is used for indicating decimal point. Seven segment displays internally consist of 8 LEDs. Circuit 2: Interfacing 7 Segment Display to 8051 (4-Digit – CA).Circuit 1: Interfacing 7 Segment Display to 8051 (Single Digit – CC). ![]()
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