Embedded Systems for Ultrasonic Distance Measurement

Embedded Systems Development for Ultrasonic Distance Measurement

This code, tailored for the PIC18F4321 microcontroller, orchestrates ultrasonic distance measurements displayed on an LCD screen. It meticulously configures the microcontroller, utilizing global variables for efficient data management. The implementation encompasses precise timing through Timer 0 and a well-structured main loop for continuous distance monitoring. The inclusion of a custom LCD library enhances the display output. This code serves as a robust foundation for projects involving distance sensing. If you need help with your C assignment related to microcontroller programming or distance measurement, this code offers insights into key considerations and practices in embedded systems development.

Block 1: Header Files and Definitions


#include < p18f4321.h >
#include < delays.h >
#include < stdio.h >
#include < stdlib.h >
#include < timers.h >
#include < CQU_LCD_Ver_2.h >

This section includes necessary header files for the PIC18F4321 microcontroller, delay functions, standard input/output functions, timers, and a custom LCD library. It also defines macros for TRIG and ECHO pins.

Block 2: Configuration Bits


#pragma config WDT = OFF
#pragma config LVP = OFF
#pragma config BOR = OFF
#pragma config OSC = INTIO2

These pragma directives set the configuration bits for the microcontroller. They disable the watchdog timer, low voltage programming, brown-out reset, and configure the oscillator to use the internal clock in Mode 2.

Block 3: Global Variables


unsigned int TimeoutCounter = 0;
short int DH;
long int pulse_count;
char LCD_Char[16];
float distance;
float pulse_time;
int distance_w, distance_d;

Declaration of global variables used in the program, such as counters, distance values, and LCD character arrays.

Block 4: Main Function


void main(void) {

The main function starts here, and it initializes the microcontroller settings, sets up the I/O ports, configures the timer, and enters an infinite loop to continuously measure and display distances.

Block 5: Port Configuration


ADCON1 = 0x0F;
TRISAbits.TRISA1 = 0;
TRISAbits.TRISA2 = 1;
TRISCbits.TRISC0 = 1;

Configures the ADCON1 register to set Port A as digital, sets TRISA1 (TRIG) as an output, TRISA2 (ECHO) as an input, and TRISC0 as an input for a switch.

Block 6: Timer 0 Initialization


T0CON = 0x08;

Configures Timer 0 with specific settings, enabling a 16-bit mode, using the internal clock, and setting a 1:2 prescaler.

Block 7: Pulse Generation and Echo Handling


TRIG = 0;
INTCONbits.T0IE = 1;
INTCONbits.T0IF = 0;

Initializes TRIG, enables Timer 0 interrupt, and clears Timer 0 overflow flag.

Block 8: Main Loop


while (1) {

Initiates an infinite loop for continuous operation.

Block 9: Ultrasonic Pulse and Timer Logic


WriteTimer0(0);
TRIG = 1;
Delay1TCY();
// (omitted for brevity)

Block 10: LCD Display


sprintf(LCD_Char, "Dis: %d.%d mm", distance_w, distance_d);
LCDClear();
DStrToLCD(LCD_Char);
Delay10KTCYx(10);

Block 11: End of Program


return;
}

Ends the main function.

Conclusion

In conclusion, our dedicated programming support at ProgrammingHomeworkHelp.com ensures mastery in ultrasonic distance measurement using PIC18F4321 microcontrollers. We've meticulously crafted a codebase that integrates precise timing mechanisms, efficient global variable management, and a custom LCD library for clear and concise distance displays. Whether you're delving into embedded systems development or seeking assistance with your C assignment, our team stands ready to guide you through the intricacies of microcontroller programming. With a focus on excellence, our resources empower you to navigate the complexities of distance sensing projects, providing not just solutions, but a deeper understanding of programming principles. Trust us for comprehensive, expert-level support tailored to your programming journey.

Ultrasonic Distance Measurement with PIC18F4321 Microcontroller