Expanding Inputs from "StampWorks"

TonyA

Hi,

I am reading the "Experiment #24b: Expanding Inputs" from "StampWorks', using the shift registers.

I'm having a problem understanding how the program will determine the state of each individual switch. Does it just determine whether any switch is on or off, or does the program determine the state of each individual switch?

I need something like this:

If switch #1 is on then serout [noparse][[/noparse]this]
If switch #2 is on then serout [noparse][[/noparse]that]
etc. (for 24 sensors, so I will need 3 shift reg. IC's)

Thanks for any suggestions.

Tony A

Post Edited (TonyA) : 10/23/2005 1:34:47 PM GMT

Jon Williams

Remember that every variable in PBASIC is bit-addressable, so you can do something like this after you read a·value back from the 74HC165:

· IF (status1.BIT0 = 1) THEN
··· SEROUT TX, Baud, [noparse][[/noparse]"Button 1 pressed", CR]
· ENDIF

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Jon Williams
Applications Engineer, Parallax

TonyA

Very cool, thanks.

Tony A