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# BASIC STAMP : How to input bits into an accumilator

Posted on 2005-03-26
Medium Priority
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Lets say I have two push button switches connected to the input port of a basic stamp. What I want to know is how to write a simple program to input a "1" when the 1st button is press and a "0" when the sexond button is pressed. I'll have the the 5v connected to both switches and a not gate connected to the second.
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Question by:940775
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LVL 7

Expert Comment

ID: 13637893
If I understand the problem, you want to use ONE input port, which to the stamp is either a 1 or a 0, and connect two buttons to it to detect either a 1 or a 0 .... it doesn't seem possible.

You'd need a tri-state input for that...which would be "seen" as a 1 a 0 or "not a 1 or 0" as the third state. I don't believe the stamp can do that.

Now it you're using two input ports, no problem!
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Author Comment

ID: 13638033
OK LRHGuy, lets use two input ports. How would you write the code  (just an example)?
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LVL 7

Accepted Solution

LRHGuy earned 1000 total points
ID: 13638325
With the stamp it's a simple process:

KEEPGOING:
IF PIN1=1 THEN DOONE
IF PIN2=0 THEN DOTWO
GOTO KEEPGOING

DOONE:
; handle button
GOTO KEEPGOING

DOTWO
; handle button
GOTO KEEPGOING

Put whatever you need to do in the DOONE/DOTWO sections.
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