use 74HC595 to control 16 led?

[Jakkawad]

how to call second 74HC595 pin?
can use 'pin9'?

[jthomaschewski]

Use provided shiftRegisters(num) in initialization:

shiftRegisters(2)
digitalWrite(9, HIGH)

this does work for me

[chapunazar]

So far I successfully linked 4 registers... planning to link 8 :P

[superino92]

how do you connect the second shift register?? please somebody help me i need 20 output

[chapunazar]

Hi, here you can see how you can connect 2 registers. Though its for arduino it works perfectly for Rpi pin voltage levels. Adding more registers as simple as chaining them

[superino92]

HELP!!! look what my program in python say it!
Traceback (most recent call last):
File "tres.py", line 9, in
shiftRegisters(2)
NameError: name 'shiftRegisters' is not defined

[chapunazar]

make sure you are importing correctly shiftpi and also try with
shiftpi.shiftRegisters(2)