activating stepper motor with IR fork light sensor

hi,

for school project making chewing gum dispenser. dispenser using arduino uno r3, 28byj-48 stepper motor , ir fork light barrier.
the goal of setup coin rolls through fork light barrier in turn triggers te stepper motor complete number of steps.

the problem i'm bumping code have allows stepper motor rotate when stays in between fork light barrier instead of passing through it.

i wondering if willing me adjust code solve problem.

thank you,
mitch

code: [select]


/*
   byj48 stepper motor code
   connect :
   in1 >> d8
   in2 >> d9
   in3 >> d10
   in4 >> d11
   vcc ... 5v prefer use external 5v source
   gnd
   written :mohannad rawashdeh
  https://www.instructables.com/member/mohannad+rawashdeh/
     28/9/2013
  */

#define in1  8
#define in2  9
#define in3  10
#define in4  11

int steps = 0;
boolean direction = true;// gre
unsigned long last_time;
unsigned long currentmillis ;
int steps_left=17786;
long time;
int isobstaclepin = 7;
int isobstacle = low;

void setup()
{
serial.begin(115200);
pinmode(isobstaclepin, input);     
pinmode(in1, output);
pinmode(in2, output);
pinmode(in3, output);
pinmode(in4, output);
// delay(1000);

}

void loop()
{

  while(steps_left>0){
  currentmillis = micros();
  if(currentmillis-last_time>=1000){
  stepper(1);
  time=time+micros()-last_time;
  last_time=micros();
  steps_left--;
  }
 
 
  }
   serial.println(time);
  serial.println("wait...!");
  delay(2000);
  direction=!direction;
  steps_left=0;


}
void stepper(int xw){   
  (int x=0;x<xw;x++){
switch(steps){
   case 0:
     digitalwrite(in1, low);
     digitalwrite(in2, low);
     digitalwrite(in3, low);
     digitalwrite(in4, high);
   break;
   case 1:
     digitalwrite(in1, low);
     digitalwrite(in2, low);
     digitalwrite(in3, high);
     digitalwrite(in4, high);
   break;
   case 2:
     digitalwrite(in1, low);
     digitalwrite(in2, low);
     digitalwrite(in3, high);
     digitalwrite(in4, low);
   break;
   case 3:
     digitalwrite(in1, low);
     digitalwrite(in2, high);
     digitalwrite(in3, high);
     digitalwrite(in4, low);
   break;
   case 4:
     digitalwrite(in1, low);
     digitalwrite(in2, high);
     digitalwrite(in3, low);
     digitalwrite(in4, low);
   break;
   case 5:
     digitalwrite(in1, high);
     digitalwrite(in2, high);
     digitalwrite(in3, low);
     digitalwrite(in4, low);
   break;
     case 6:
     digitalwrite(in1, high);
     digitalwrite(in2, low);
     digitalwrite(in3, low);
     digitalwrite(in4, low);
   break;
   case 7:
     digitalwrite(in1, high);
     digitalwrite(in2, low);
     digitalwrite(in3, low);
     digitalwrite(in4, high);
   break;
   default:
     digitalwrite(in1, low);
     digitalwrite(in2, low);
     digitalwrite(in3, low);
     digitalwrite(in4, low);
   break;

 
 
 
  } 
setdirection();
}
}
void setdirection(){
 isobstacle = digitalread(isobstaclepin);
if (isobstacle == high) {
if(direction==1){ steps++;}
if(direction==0){ steps--; }
if(steps>7){steps=0;}
if(steps<0){steps=7; }
}
}




quote

the problem i'm bumping code have allows stepper motor rotate when stays in between fork light barrier instead of passing through it.

you need detect when light becomes interrupted rather when is interrupted.

look @ statechangedetection example in ide

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