using a photo interrupt sensor as a gate limiter

i rebuilding mighty mule gate opener, electronics burned out. new @ arduino thing
and having hard time photo interrupt sensor. ( keyestudio , work fine).
i trying write learn loop , can't 2 limit switches in opener because of space requirements. unit had photo sensor on , want use count number of
times opening in wheel comes around turn off motor when open or
closed. think figured major portion of out. counting of slots in wheel
i having trouble. there kinds of examples of rpm sketches. nothing can find has
a simple counter stores value in value , resets sensor zero.

this cam not seem right. @ first "if" statement.
does record number of times sensor switched ?

code:

   void opengatelearn () {
       digitalwrite(opengate, high);  //turn on gate using h-bridge
       digitalwrite(pwm, 245);        // send power level motor
       
    if(digitalread(photosensor == low) {
       sensorvalue++;
       serial.println("sensorvalue");  //prints debugging
       serial.println(sensorvalue);    //prints debugging
    }
    if (openlimit == low) {          //looks open limit button pressed
       digitalwrite(opengate, low);  //stops gate opening
       digitalwrite(pwm, 0);         //shuts off power motor
       opensensorvalue = sensorvalue;  //sends sensorvalue opensensorvalue read later
       sensorvalue = 0;                // resets sensorvalue zero
       }
  }
 

code: [select]

if(digitalread(photosensor == low) this true when input is low several increments whilst low.  instead, want count how many times input becomes low in statechangedetection example in ide

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