Driving pin high

Archiver

I have a Basic Stamp Rev D (one of the first models). I am having a
problem with the I/O pins (0 - 7). They work well as outputs, to
drive stepper motors and so-forth. When set as inputs, I cannot get
pins 4 or 5 to "go high".

I try to apply +5 VDC (and also +12 VDC) to either pin, and watch the
state on a debug window. It always stays low (0).

I have checked and the power supply for the Stamp has a common ground
to the +5 VDC line I am trying to use to pull the pin high.

I need to be able to read the inputs on pins 4 & 5 to watch when they
go high, to run a simple program. When either pin goes high it makes
the program jump to a subroutine.

Thanks,

Mike

Archiver

>drive stepper motors and so-forth. When set as inputs, I cannot get
>pins 4 or 5 to "go high".
>
>I try to apply +5 VDC (and also +12 VDC) to either pin, and watch the
>state on a debug window. It always stays low (0).

An input pin must be "pulled" high. do this by connecting it to +5 with
a 10k resistor.

Carl