distance measurement for ping sensor More...

#include "main.h"

Macros
#define	period 20

#define	clockwise 0x4E000

#define	cclockwise 0x47500

#define	TIMER4B_PRESCALER 50

Functions
void	TIMER3B_Handler (void)
	handles interrupts More...

void	ping_init ()
	initializes ping sensor More...

void	send_pulse ()
	sends a pulse to the ping sensor More...

int	ping_read ()
	reads the response pulse from the ping sensor More...

double	time2dist (int time)
	convert a sonar pulse width time to a distance More...

void	clock_timer_init3 (void)
	initializes a clock timer More...

Variables
volatile int	overflow

volatile int	rise_time

volatile int	fall_time

volatile int	j

volatile float	servo_angle

Detailed Description

distance measurement for ping sensor

Author: Steven, Kynara, Saba, Bailey, Brett, Austin

Date: 4/24/18

Definition in file ping.c.

Function Documentation

◆ clock_timer_init3()

void clock_timer_init3 ( void )

initializes a clock timer

sets up the interrupt timer

Definition at line 123 of file ping.c.

◆ ping_init()

void ping_init ( )

initializes ping sensor

initializes registers and ports for the ping sensor

Definition at line 55 of file ping.c.

◆ ping_read()

int ping_read ( )

reads the response pulse from the ping sensor

start and read the ping sensor once, return distance in cm

Definition at line 85 of file ping.c.

◆ send_pulse()

void send_pulse ( )

sends a pulse to the ping sensor

sends a pulse to activate the ping sensor set pin to output, set high for 5us, set low, set to input

Definition at line 69 of file ping.c.

◆ time2dist()

double time2dist ( int time )

convert a sonar pulse width time to a distance

convert pulse width to cm

Parameters

time	is length of pulse from ping sensor time it took to send and receive a sonar pulse

Definition at line 112 of file ping.c.

◆ TIMER3B_Handler()

void TIMER3B_Handler ( void )

handles interrupts

detects rising and falling edges of the sensor pin

Definition at line 32 of file ping.c.

Macros

Functions

Variables