Apart from char ‘i’ and ‘j’, an array ‘ar’ has also been declared. Ī delay function has been declared at the beginning of the code which is used to slow done the abrupt changes in the counter of ones segment, which is then effective for tens segment as well.+112 −0 Display7Seg/Display 7 Seg .workspace.Display7Seg/Display 7 Seg PIC18F4550.pdsprj.Display7Seg/Backup Of Display 7 Seg PIC18F4550.pdsbak.This is a free software with NO WARRANTY. Interfacing PIC16F887 with common anode 7-segment display. Since the 4 digits are multiplexed we need to refresh the display very quickly (display one digit at a time, others are off), for that I used Timer0 module (8-bit timer) interrupt with 1:16 prescaler, this means Timer0 overflows every 2048 microseconds. The following C code is for mikroC PRO for PIC compiler, it was tested with version 7.2.0. Interfacing PIC16F887 MCU with 7-segment display C code: In this project the PIC16F887 microcontroller runs with its internal oscillator 8 MHz, MCLR pin is configured as an input pin. The push button which is connected to PIC16F887 pin RB4 (#37) is used to increment the displayed number.Ī common anode 7-segment display is used in this example. The 4 transistors are used to supply the display LEDs with sufficient current because the PIC16F887 microcontroller may not be able to do that (maximum output current is 25 mA).Įach transistor emitter pin is connected to +5V and each transistor base is connected to the PIC16F887 through 4.7k resistor as follows:ĭigit 1 (most left) transistor base is connected to PIC16F887 pin RB3 (#36)ĭigit 2 transistor base is connected to PIC16F887 pin RB2 (#35)ĭigit 3 transistor base is connected to PIC16F887 pin RB1 (#34)ĭigit 4 (most right) transistor base is connected to PIC16F887 pin RB0 (#33)Įach 100 ohm resistor is used for limiting the current that passes through the segment LED. That means each transistor supplies one digit segments. In the circuit there are 4 transistors of the type PNP, the collector of each transistor is connected to common anode pin of 1 digit. Project circuit schematic diagram is shown below.Īll the grounded terminal are connected together. Interfacing PIC16F887 MCU with 7-segment display circuit: PIC16F887 microcontroller -> datasheet.So, for a 4-digit display we’ll have 7 pins of the 7 segments, 4 pins of the 4 digits (common terminals) and 1 pin for the decimal point (DP) which means a total of 12 pins. This technique minimizes number of pins used. In multi-digit 7-segment display (for example 4-digit) all pins of the same segment are connected together (segment A of digit 1 with segment A of digit 2 …), and each digit has its common pin alone.
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