Published June 4, 2026 © GPL3+

Smart LED Sequence Controller with OLED Display

A PIC16F877A-based embedded system that controls sequential LED animations while providing real-time visual feedback through an OLED display

IntermediateFull instructions provided6 hours18

Smart LED Sequence Controller with OLED Display

Things used in this project

Hardware components

Microchip PIC16F

ElectroPeak 0.96" OLED 64x128 Display Module

LED, RGB

LED (generic)

Buzzer

8 MHz Crystal

Resistor 10k ohm

Resistor 220 ohm

Through Hole Resistor, 330 kohm

Capacitor 22 pF

Software apps and online services

Proteus Professional

Microchip MPLAB X IDE

Hand tools and fabrication machines

PCB Holder, Soldering Iron

Story

This project demonstrates the integration of multiple embedded hardware peripherals into a single intelligent control system.

The PIC16F877A microcontroller controls a sequence of LEDs that illuminate in predefined patterns while displaying operational information on a 128×64 OLED display. An RGB LED provides color-coded system status indication, while a buzzer generates audible notifications during operation.

The project was designed and simulated using Proteus Professional, including:

Circuit Design
Firmware Development
PCB Layout Design
3D PCB Visualization

The result is a compact embedded controller that showcases microcontroller programming, digital output control, user feedback systems, and PCB design skills.

1 / 3

Schematics

Code

Smart LED Sequence Controller with OLED Display Summary

#include <xc.h>

#define _XTAL_FREQ 4000000

// CONFIGURATION BITS
#pragma config FOSC = HS
#pragma config WDTE = OFF
#pragma config PWRTE = ON
#pragma config BOREN = ON
#pragma config LVP = OFF
#pragma config CPD = OFF
#pragma config WRT = OFF
#pragma config CP = OFF

// LCD CONTROL PINS
#define RS RC0
#define EN RC1

void pulse_enable()
{
    EN = 1;
    __delay_ms(2);
    EN = 0;
}

void lcd_cmd(unsigned char cmd)
{
    PORTC &= 0x0F;

    PORTC |= (cmd & 0xF0);

    RS = 0;

    pulse_enable();

    PORTC &= 0x0F;

    PORTC |= ((cmd << 4) & 0xF0);

    pulse_enable();

    __delay_ms(2);
}

void lcd_data(unsigned char data)
{
    PORTC &= 0x0F;

    PORTC |= (data & 0xF0);

    RS = 1;

    pulse_enable();

    PORTC &= 0x0F;

    PORTC |= ((data << 4) & 0xF0);

    pulse_enable();

    __delay_ms(2);
}

void lcd_init()
{
    __delay_ms(20);

    lcd_cmd(0x02);
    lcd_cmd(0x28);
    lcd_cmd(0x0C);
    lcd_cmd(0x06);
    lcd_cmd(0x01);
}

void lcd_string(const char *str)
{
    while(*str)
    {
        lcd_data(*str++);
    }
}

void main(void)
{
    int i;

    TRISD = 0x00;
    TRISB = 0x00;
    TRISC = 0x00;

    PORTD = 0x00;
    PORTB = 0x00;
    PORTC = 0x00;

    lcd_init();

    lcd_string("LED CHASER");

    while(1)
    {
        for(i = 0; i < 8; i++)
        {
            PORTD = (1 << i);

            // RGB CONTROL
            if(i % 3 == 0)
            {
                PORTB = 0x01;
            }
            else if(i % 3 == 1)
            {
                PORTB = 0x02;
            }
            else
            {
                PORTB = 0x04;
            }

            // BUZZER
            RB3 = 1;
            __delay_ms(50);

            RB3 = 0;
            __delay_ms(200);
        }
    }
}

Credits

Emmanuel Egyin

2 projects • 0 followers

Electrical engineer building reliable emberded systems that turn ideas into working hardware fast.