Need help adding proximity switch protection to hydraulic cylinder actuation

hello everybody,

can me code below please?
it's small program control hydrolic cilinder operate in , out.
1 potmeter use time/distance out,if time/distance reached goes in.
1 potmeter giving waitingtime next cycle , on.
i have done allot of reading forum's , projects find out want.
maybe difficult arduino starter me......
the code below works but, want put somekind of securety in use of proximity switch.
like reference "see" when cilinder in.

here code
regards everybody

code: [select]

int potpin1 = a0;      // select pin liftheight potmeter                              
int potpin2 = a1;      // select  pin wait potmeter                                
int potvalue1 = 0;     // variable
int relaispin = 12;    // select pin  relais 12                                  
// int proxpin =10;       // select pin proximity sensor       new
// int startbutton = 9;    // select pin startup                    new


void setup() {
 
 pinmode(relaispin, output);     // declare relaispin output
 pinmode(potpin1,    input);     // declare 1 potmeter input
 pinmode(potpin2,    input);     // declare 2 potmeter input
//  pinmode(proxpin,    input);     //declare proxpin input       new
//  pinmode(startbutton, input);    //declare startbutton         new
}

void loop() {
 
 potvalue1 = analogread(potpin1);   //
 digitalwrite(relaispin, high);     //
 delay(potvalue1+50);               //
 digitalwrite(relaispin, low);      //
 potvalue1 = analogread(potpin2);   //
 delay(potvalue1+150);              //  
}



moderator edit: real [font=verdana][[/font]code] [font=verdana][[/font]/code] tags added

moderator edit: title made more meaningful (nick gammon)

quote

1 potmeter use time/distance out,if time/distance reached goes in.

is potentiometer defining time or distance? time , distance , not same thing.

quote

what want put somekind of securety in use of proximity switch.

and problem is?

what going trigger proximity switch? supposed happen when proximity switch triggered?

for safety, these:
  delay(potvalue1+50);               //
  delay(potvalue1+150);              // 
have got go. won't able read proximity switch while donothingbuthandleinterruptsforawhile() call happening.

look @ blink without delay example.

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