# INPUT / OUTPUT Examples

Syntax: INPUT, OUTPUT

    ' 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
    ' 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
      END

NOTE: The example below is written for the BS2 and will run on any of the BS2-family modules. Modify the $STAMP directive (as required) before downloading to the BS2e, BS2sx, BS2p, BS2pe, or BS2px.

    ' INPUT_OUTPUT.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 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
    ' 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: ",
            BIN1 IN7, CR

      OUT7 = 0                              ' Write 0 to output latch
      DEBUG "After 0 written to OUT7: ",
            BIN1 IN7, CR

      OUTPUT 7                              ' Make P7 an output
      DEBUG "After P7 changed to output: ",
            BIN1 IN7
      END

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BASIC Stamp Help Version 2.5.4

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8/8/2012