BASIC stamp manual v2.2

INPUT – BASIC Stamp Command Reference
Page 244 • BASIC Stamp Syntax and Reference Manual 2.2 • www.parallax.com
on the BS1) will appear on the pin. The demo program shows how this
works.
Demo Program (INPUT.bs1)
' INPUT.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 OUTS when it's an output. To set up the demo,
' connect a 10k resistor from +5V to P7 on the BASIC Stamp. The resistor
' to +5V puts a high (1) on the pin when it's an input. The BASIC Stamp
' can override this state by writing a low (0) to bit 7 of OUTS and
' changing the pin to output.
' {$STAMP BS1}
' {$PBASIC 1.0}
Main:
INPUT 7 ' Make P7 an input
DEBUG "State of P7: ", #PIN7, CR
PIN7 = 0 ' Write 0 to output latch
DEBUG "After 0 written to OUT7: "
DEBUG #PIN7, CR
OUTPUT 7 ' Make P7 an output
DEBUG "After P7 changed to output: "
DEBUG #PIN7
Demo Program (INPUT.bs2)
' INPUT.bs2
' 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 INS)
' is determined by the outside world when the pin is an input, and by the
' corresponding bit of OUTS when it's an output. To set up the demo,
' connect a 10k resistor from +5V to P7 on the BASIC Stamp. The resistor
' to +5V puts a high (1) on the pin when it's an input. The BASIC Stamp
' can override this state by writing a low (0) to bit 7 of OUTS and
' changing the pin to output.
' {$STAMP BS2}
' {$PBASIC 2.5}
Main:
INPUT 7 ' Make P7 an input
DEBUG "State of P7: ",
1
All 2
NOTE: This example program can be
used with all BS2 models by changing
the $STAMP directive accordingly.