BASIC stamp manual v2.2

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5: BASIC Stamp Command Reference – OUTPUT

BASIC Stamp Syntax and Reference Manual 2.2 • www.parallax.com • Page 293

OUTPUT

BS1 BS2 BS2e BS2sx BS2p BS2pe BS2px

OUTPUT Pin

Function

Make the specified pin an output.

• Pin is a variable/constant/expression (0 – 15) that specifies which

I/O pin to set to output mode.

Quick Facts

Table 5.62: OUTPUT Quick

Facts.

BS1 and all BS2 Models

Commands

INPUT and REVERSE

Explanation

There are several ways to make a pin an output. Commands that rely on

output pins, like PULSOUT and SEROUT, automatically change the

specified pin to output. Writing 1s to particular bits of the variable DIRS

makes the corresponding pins outputs. And then there’s the OUTPUT

command.

When a pin is an output, your program can change its state by writing to

the corresponding bit in the OUTS variable (PINS on the BS1). For

example:

OUTPUT 4

OUT4 = 1

When your program changes a pin from input to output, whatever state

happens to be in the corresponding bit of OUTS (PINS on the BS1) sets the

initial state of the pin. To simultaneously make a pin an output and set its

state use the HIGH and LOW commands.

Demo Program (INPUT_OUTPUT.bs1)

' INPUT_OUTPUT.bs1

' This program demonstrates how the input/output direction of a pin is

' determined by the corresponding bit of DIRS. It also shows that the

' state of the pin itself (as reflected by the corresponding bit of PINS)

' is determined by the outside world when the pin is an input, and by the

' corresponding bit of PINS when it's an output. To set up the demo,

' connect a 10k resistor from +5V to P7 on the BASIC Stamp. The resistor

NOTE: Expressions are not allowed as

arguments on the BS1. The range of

the Pin argument on the BS1 is 0 – 7.

FFECTS OF SETTING AN INPUT PIN TO AN

OUTPUT

All