shiftout: does SH_CP and DS have to be pin 11 and 12?

Projects General Guidance
1

Hi,

I've build a waveshield and now I want to use a 595 for adding some more I/O's. The thing is, the waveshield is hardwired to communicate over pin 11 and 12, and in this tutorial: http://arduino.cc/en/Tutorial/ShiftOut it says to use pin 11 for DS and pin 12 for SH_CP.

Can I change that to any other pin or does it have anything to say that it's at those exact pins?

Søren

2

Hi Søren,

reread the page and you see they mean the pin 11 and 12 of the 595.
On the Arduino side you can use any pin (but preferable not 0 and 1 as that is the serial port).

3

robtillaart:
Hi Søren,

reread the page and you see they mean the pin 11 and 12 of the 595.
On the Arduino side you can use any pin (but preferable not 0 and 1 as that is the serial port).

as far as I can see they adress 11 and 12 specifically on both the arduino side and 595:

"DS (pin 14) to Ardunio DigitalPin 11 (blue wire)
SH_CP (pin 11) to to Ardunio DigitalPin 12 (yellow wire)
ST_CP (pin 12) to Ardunio DigitalPin 8 (green wire)"

.. So doing bitshifting like this with a 595 doesn't have anything to do with the i2c ports on the arduino, right?
I just don't want to mix things together, and I'm pretty new to this so :slight_smile:

4

Yes but you can use other pins too as long as that is reflected in the code. If the hardware uses pin 4 for CLOCK the software must use digitalWrite(4,..) too.