74HC595 shifting to second chip

Projects Programming
1

Hi,

I've followed the tutorial on http://www.arduino.cc/en/Tutorial/ShiftOut, and have the 2 74HC595s set up just like in the tutorial. However, I'm having difficulty figuring out how to control the lights on the 2nd set of lights.

I tried to just send out the shift out command twice, so the first goes to the 2nd 74HC595.. It didn't work

void loop()
{
 power(0,1);
 power(1,1);
 power(2,1);
 power(3,1);
 power(4,1);
 power(5,1);
 power(6,1);
 power(7,1);
 

}

void power(int x,int set)
{
    delay(150); 
    x = intpow2(x); 
    digitalWrite(3,LOW);
    shiftOut(2,4, MSBFIRST, x);
    shiftOut(2,4, MSBFIRST, x);
    digitalWrite(3, HIGH);
   //digitalWrite(3,LOW);

}

tips pls? :smiley:

2

Personally I used SPI rather than shiftOut. See here:

In what way didn't it work? Did the first set of lights change but not the second?