12v sennse and a button

ok have 2 questions id input;

1st need arduino sense when circuit has activated 12v circuit how safely connect 2?

2nd question need momentary switch go hgh , stay high no matter how many times pressed ideas?

here code not tested yet because i'm still waiting parts.

[quote//#include <liquidcrystal.h>
//liquidcrystal lcd(13,12,11,10,a5,a4)


// input pins
int pirpin = 8;
int doorpin = 7;
int setpin = 6;
int disarmpin = 5;
//output pins
int sirenpin = 4;
int siren2pin = 3;
int strobepin = 9;
//var


void setup()
{
  pinmode(pirpin, input);
  pinmode(doorpin, input);
  pinmode(setpin, input);
  pinmode(disarmpin, input);
  pinmode(sirenpin, output);
  pinmode(siren2pin, output);
  pinmode(strobepin, output);
}

void loop()
{
  if (digitalread(setpin) == high && digitalread(pirpin) == high)
  {
    digitalwrite(sirenpin, high); digitalwrite(strobepin, high);
    //delay(900000);
    //digitalwrite(sirenpin, low);
  }
  else
  {
    digitalwrite(sirenpin, low);
  }
 
  if (digitalread(setpin) == high && digitalread(doorpin) == high)
  {
    digitalwrite(sirenpin, high); digitalwrite(strobepin, high);
  }
  else
  {
    digitalwrite(sirenpin, low);
  }
 
  if (digitalread(setpin) == high && digitalread(doorpin) == high && digitalread(pirpin) == high)
  {
    digitalwrite(sirenpin, high); digitalwrite(strobepin, high);
  }
  else
  {
    digitalwrite(sirenpin, low);
  }
 
  if (digitalread(disarmpin) == high)
  {
  digitalwrite(sirenpin, low); digitalwrite(strobepin, low);
  }

}
  [/quote]

would work?

code: [select]

if digitalread(setpin, high);
digitalwrite(setpin, high);

else digitalwrite(sepin, high);

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