sprint_timing_example.ino File Reference

#include <DovesLapTimer.h>
#include <SprintTimer.h>

Functions
void	feedFix ()
double	latAt (double yMeters)
double	lngAt (double xMeters)
void	loop ()
void	printRun ()
void	setup ()

Variables
const double	BASE_LAT = 28.40000
const double	BASE_LNG = -81.40000
const double	COURSE_END_X = 500.0
bool	done = false
const double	FINISH_X = 450.0
const double	LINE_HALF_WIDTH = 10.0
const double	M_PER_DEG_LAT = 111194.9266
const double	M_PER_DEG_LNG = 111194.9266 * 0.879649
const double	RETURN_Y = 40.0
const unsigned int	RUNS_TO_DO = 3
unsigned int	runsSeen = 0
const double	S2_X = 150.0
const double	S3_X = 300.0
const float	SIM_ALT_METERS = 50.0f
const unsigned long	SIM_MS_PER_STEP = 200
const float	SIM_SPEED_KNOTS = 48.0f
int	simPhase = 0
unsigned long	simTimeMs = 0
double	simX = 0
double	simY = 0
SprintTimer	sprintTimer (7.0)
const double	START_X = 50.0
const double	STEP_METERS = 5.0

Function Documentation

feedFix()

void feedFix

(

)

latAt()

double latAt

(

double

yMeters

)

lngAt()

double lngAt

(

double

xMeters

)

loop()

void loop

(

)

printRun()

void printRun

(

)

setup()

void setup

(

)

Variable Documentation

BASE_LAT

const double BASE_LAT = 28.40000

Sprint (Point-to-Point) Timing Example for DovesLapTimer's SprintTimer

Demonstrates sprint-mode run timing — autocross / hillclimb style: a START line and a SEPARATE FINISH line, no laps — using a SYNTHETIC GPS course, no GPS hardware required. The timer is driven through three simulated runs down a 500 m straight (loop back on a parallel return leg between runs) so you can watch run times, split segments, best-run and optimal tracking light up on Serial.

Course layout (x = meters along the course):

0m ── START(50m) ── S2(150m) ── S3(300m) ── FINISH(450m) ── 500m |----------— timed run: 400m -----------—| return leg 40m north of the course, outside every crossing zone

Sprint semantics demonstrated:

• a start-line crossing begins a run; a finish-line crossing ends it
• crossing the start again MID-RUN cancels and restarts (botched course)
• finish crossings with no active run are ignored (the return loop)
• splits are optional: zero, one, or two lines are all legal

To adapt for a real course:

1. Replace the line coordinates below with your own (Google Maps right-click -> copy lat,lng).
2. Delete the synthetic-drive block in loop().
3. Feed real GPS: lat, lng, altitude (m), speed (knots) into sprintTimer.loop(), and ms-since-midnight into sprintTimer.updateCurrentTime().

RAM note: each configured line owns an independent crossing buffer (~2.9 KB each on 32-bit targets). SprintTimer targets modern MCUs (nRF52840, ESP32, ...) — it does not fit small AVRs.

BASE_LNG

const double BASE_LNG = -81.40000

COURSE_END_X

const double COURSE_END_X = 500.0

done

bool done = false

FINISH_X

const double FINISH_X = 450.0

LINE_HALF_WIDTH

const double LINE_HALF_WIDTH = 10.0

M_PER_DEG_LAT

const double M_PER_DEG_LAT = 111194.9266

M_PER_DEG_LNG

const double M_PER_DEG_LNG = 111194.9266 * 0.879649

RETURN_Y

const double RETURN_Y = 40.0

RUNS_TO_DO

const unsigned int RUNS_TO_DO = 3

runsSeen

unsigned int runsSeen = 0

S2_X

const double S2_X = 150.0

S3_X

const double S3_X = 300.0

SIM_ALT_METERS

const float SIM_ALT_METERS = 50.0f

SIM_MS_PER_STEP

const unsigned long SIM_MS_PER_STEP = 200

SIM_SPEED_KNOTS

const float SIM_SPEED_KNOTS = 48.0f

simPhase

int simPhase = 0

simTimeMs

unsigned long simTimeMs = 0

simX

double simX = 0

simY

double simY = 0

sprintTimer

SprintTimer sprintTimer(7.0)

(

7.

0

)

START_X

const double START_X = 50.0

STEP_METERS

const double STEP_METERS = 5.0