Shift register 74HC595-switching 2LED at the same

looking sample code found in tutorial section (http://www.arduino.cc/en/tutorial/shiftout) can switch "on" leds 1 one using second example. in specific case want light example led3 , led7 need switch between led3 , led7 reduces lumen output @ least 50%, correct?

how code have cases described above, switchin on 2 or 3 leds same time?

the simplest code want, given definitions , setup() in example

code: [select]


 // turn off output pins don't light up
 // while you're shifting bits:
 digitalwrite(latchpin, low);

 // shift bits out:  0b10001000 sets pins 3 , 7
 shiftout(datapin, clockpin, msbfirst, 0b10001000);

   // turn on output leds can light up:
 digitalwrite(latchpin, high);


probably wise use procedure set value:

code: [select]


void setbits(int val) {
 // turn off output pins don't light up
 // while you're shifting bits:
 digitalwrite(latchpin, low);

 // shift bits out:  
 shiftout(datapin, clockpin, msbfirst, val);

   // turn on output leds can light up:
 digitalwrite(latchpin, high);
}

and call like

code: [select]


  setbits(0b10001000);

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