Originally Posted By: Eddie123
Hello.

Looking into connecting loads of buttons using shift registers.

So far I think I have figured out that the main difference between the 74HC165 and the 4021 is that one is
active high, the other low, right ?

So, I presume the MMJoy converts this automatically, so there is really no difference which I use ?

Do anyone have a proper draeing of how to connect up the shift registers ? What do I need besides pullup resistors, etc?

Thank you

Vegard

I use the gammon pages a lot.

Switches, pullups
http://www.gammon.com.au/forum/?id=11955

Shift registers
http://www.gammon.com.au/forum/?id=11979