Source code

#include <18f452.h>

#device ADC = 10;

#fuses HS, NOWDT, NOPROTECT, BROWNOUT, PUT, NOLVP

#use delay(clock = 10000000)

#use rs232(UART1, baud=9600)

#include "flex_lcd.c"

#include <math.h>

int x = 0;

int previousS2 = 0;

int count = 0;

int s1, s2, s3, rate, previousS1;

float distance_value;

unsigned int16 i, ldr_value;

//=============================================================================================

void start()

{

do {

s2 = input(PIN_C1);

while ( s2 == 1 && count == 0 )

previousS2 = 1;

lcd_putc("\f");

lcd_putc("Press S2 to");

lcd_gotoxy(1,0);

lcd_putc("start");

delay_ms(100);

}while(previousS2 == 0);

}

//=============================================================================================

void pause()

{

do {

previousS2 = 0;

s2 = input(PIN_C1);

if (s2 == 1)

previousS2 = 1;

lcd_putc("\f");

lcd_putc("Pause");

lcd_gotoxy(1,0);

lcd_putc("Press S2 to continue");

delay_ms(200);

lcd_gotoxy(1,0);

lcd_putc("ress S2 to continue");

delay_ms(200);

lcd_gotoxy(1,0);

lcd_putc("ss S2 to continue");

delay_ms(200);

lcd_gotoxy(1,0);

lcd_putc("s S2 to continue");

delay_ms(200);

lcd_putc(" S2 to continue");

delay_ms(200);

}while(previousS2 == 0);

}

//=============================================================================================

void init() // Initialization

{

lcd_init(); // Always call this first.

setup_adc_ports(ALL_ANALOG); // Setup ADC

setup_adc( ADC_CLOCK_DIV_16 );

lcd_putc("\f"); // clear LCD

printf("\t\t==================================================\r\n"); //output for UART

printf("\t\t||\tDISTANCE (cm)\t||\tLDR (ohm)\t||\r\n");

printf("\t\t==================================================\r\n");

delay_ms(100);

}

//=============================================================================================

void ldr() // KY-018

{

set_adc_channel(0);

for(i = 0; i < 3; i++) // Read the sensor for 3 times

{

ldr_value = read_adc(); + ldr_value;

delay_ms(10);

}

ldr_value = (ldr_value/3); // Average value

}

//=============================================================================================

void distance() // SHARP IR SENSOR

{

set_adc_channel(1);

for(i = 0; i < 100; i++) // Read the sensor for 100 times

{

distance_value = read_adc() + distance_value;

}

distance_value = (distance_value/100) ; // Average value

distance_value = 10650.08 * pow(distance_value,-0.935) - 8; //convert voltage to cm

}

//=============================================================================================

void ldr_led() // LIGHT LEDs WITH SPECIFIC LDR CONDITION

{

if (ldr_value >= 135 && ldr_value <= 341)

output_b(0b00011111);

else if (ldr_value >= 109 && ldr_value <= 134)

output_b(0b00001111);

else if (ldr_value >= 94 && ldr_value <= 108)

output_b(0b00000111);

else if (ldr_value >= 82 && ldr_value <= 93)

output_b(0b00000011);

else if (ldr_value >= 73 && ldr_value <= 82)

output_b(0b00000001);

else if (ldr_value < 73)

{

output_b(0b00100000);

delay_ms(100);

output_b(0b00000000);

delay_ms(100);

}

delay_ms(100);

}

//=============================================================================================

void distance_led() // LIGHT LEDs WITH SPECIFIC DISTANCE CONDITION

{

if (distance_value > 44 && distance_value <= 50)

{

rate = 200;

output_low(PIN_C4);

output_high(PIN_C5);

delay_ms(rate);

output_low(PIN_C5);

delay_ms(rate);

}

else if (distance_value > 39 && distance_value <= 44)

{

rate = 400;

output_low(PIN_C4);

output_high(PIN_C5);

delay_ms(rate);

output_low(PIN_C5);

delay_ms(rate);

}

else if (distance_value > 34 && distance_value <= 39)

{

rate = 600;

output_low(PIN_C4);

output_high(PIN_C5);

delay_ms(rate);

output_low(PIN_C5);

delay_ms(rate);

}

else if (distance_value > 29 && distance_value <= 34)

{

rate = 800;

output_low(PIN_C4);

output_high(PIN_C5);

delay_ms(rate);

output_low(PIN_C5);

delay_ms(rate);

}

else if (distance_value >= 0 && distance_value <= 29)

{

output_high(PIN_C4);

output_high(PIN_C5);

}

}

//=============================================================================================

void display_ldr() // LDR LCD OUTPUT

{

lcd_putc("\f");

lcd_putc("LDR=");

printf(lcd_putc, "%Lu", ldr_value);

printf(lcd_putc, "%c", 0b11110100); // display O

if (ldr_value >= 341)

lcd_putc("\nDARK");

else if (ldr_value >= 135 && ldr_value <= 341)

lcd_putc("\nSTEP 1");

else if (ldr_value >= 109 && ldr_value <= 134)

lcd_putc("\nSTEP 2");

else if (ldr_value >= 94 && ldr_value <= 108)

lcd_putc("\nSTEP 3");

else if (ldr_value >= 82 && ldr_value <= 93)

lcd_putc("\nSTEP 4");

else if (ldr_value >= 73 && ldr_value <= 82)

lcd_putc("\nSTEP 5");

else if (ldr_value < 73)

lcd_putc("\nBRIGHT");

delay_ms(100);

}

//=============================================================================================

void display_distance() // DISTANCE LCD OUTPUT

{

lcd_putc("\f");

lcd_putc("DISTANCE=\n");

printf(lcd_putc, "%0.2f", distance_value); ;

lcd_putc("cm");

}

//=============================================================================================

void UART() //display value to UART terminal

{

printf("\t\t||\t%0.2f\t\t||\t%Lu\t\t||\r\n",distance_value,ldr_value);

}

//=============================================================================================

void main() // Main Program

{

init();

start(); //start program

while(1)

{

s1 = input(PIN_C0);

s3 = input(PIN_C2);

if (s3 == 1)

pause(); //pause

ldr();

distance();

if (s1 == 1 && x == 0) // check s1 status

{

previousS1 = 1;

x = 1;

}

else if (s1 == 1 && x == 1)

{

previousS1 = 0;

x = 0;

}

if (previousS1 == 1) //switch display mode

display_ldr();

else

display_distance();

ldr_led();

distance_led();

UART();

delay_ms(100);

}

}