Marek Vitula / GoalCounter

This library provides simple interface for the table football goal counter based on a IR LED or laser diode and phototransistor.

Dependents:   goal_counter_project

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GoalCounter Class Reference
Public Member Functions | Data Fields

GoalCounter Class Reference

GoalCounter class. More...

#include <GoalCounter.h>

Public Member Functions

 GoalCounter (PinName pin, Timer *t)
 Constructor.
 ~GoalCounter ()
 Destructor.
void tstart ()
 Reads value of the timer, this function is called from the interrupt pin fall edge callback.
void tstop ()
 Reads value from the timer and measures interval between end and beginning Called from the interrupt pin rise edge callback.
uint8_t get_score ()
 Returns score.
float get_balltime (uint8_t score)
 Returns time of a ball pass for a given score.
float get_balltime ()
 Returns time of a ball pass for the current score.
float get_ballspeed (uint8_t score)
 Returns speed of a ball pass for a given score.
float get_ballspeed ()
 Returns speed of a ball pass for the current score.

Data Fields

volatile uint8_t is_goal
 Variable is 1 (true) when the goal is detected.

Detailed Description

GoalCounter class.

Simple implementation of goal counter for table football using laser diode and phototransistor. Output of the phototransistor is connected to the digital input pin of MCU. When the laser beam is interrupted by ball passing the the cage Timer starts counting and measuring width of the pulse and if the duration of pulse is not longer than two seconds, goal is detected and _score variable is incremented.

Pulse duration is also used for the calculation of ball passing speed. However, measurement is not precise.

Example: 

 #include "mbed.h"
 #include "GoalCounter.h"
 
 Timer t;
 GoalCounter gc(D2, &t);
 
 int main() {
  while(1) {
       if (gc.is_goal)
           goal(); // call some function
       }
   
   }

Definition at line 36 of file GoalCounter.h.

Constructor & Destructor Documentation

GoalCounter ( PinName  pin,
Timer *  t 
)

Constructor.

Parameters:
pinInput pin where is the outpout of phototransistor connected
timerreference to the Timer instance

Definition at line 3 of file GoalCounter.cpp.

~GoalCounter (  )

Destructor.

Destroys instance

Definition at line 22 of file GoalCounter.cpp.

Member Function Documentation

float get_ballspeed ( uint8_t  score )

Returns speed of a ball pass for a given score.

Parameters:
scoreof the game
Returns:
speed of a ball pass in kph

Definition at line 61 of file GoalCounter.cpp.

float get_ballspeed (  )

Returns speed of a ball pass for the current score.

Returns:
speed of a ball pass in kph

Definition at line 70 of file GoalCounter.cpp.

float get_balltime (  )

Returns time of a ball pass for the current score.

Returns:
time of a ball pass in seconds

Definition at line 56 of file GoalCounter.cpp.

float get_balltime ( uint8_t  score )

Returns time of a ball pass for a given score.

Parameters:
scoreof the game
Returns:
time of a ball pass in seconds

Definition at line 49 of file GoalCounter.cpp.

uint8_t get_score (  )

Returns score.

Returns:
score score of the game

Definition at line 45 of file GoalCounter.cpp.

void tstart (  )

Reads value of the timer, this function is called from the interrupt pin fall edge callback.

Definition at line 27 of file GoalCounter.cpp.

void tstop (  )

Reads value from the timer and measures interval between end and beginning Called from the interrupt pin rise edge callback.

Definition at line 31 of file GoalCounter.cpp.

Field Documentation

volatile uint8_t is_goal

Variable is 1 (true) when the goal is detected.

Definition at line 92 of file GoalCounter.h.

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