BASIC stamp manual v2.2

5: BASIC Stamp Command Reference – BUTTON

BASIC Stamp Syntax and Reference Manual 2.2 • www.parallax.com • Page 139

Figure 5.1: Sample BUTTON

circuits. Active-high (left) and

active-low (right).

Demo Program (BUTTON.bs1)

' BUTTON.bs1

' Connect an active-low circuit to pin P0 of the BS1. When you press the

' button, the DEBUG screen will display an asterisk (*). The program, as

' shown below, will print an asterisk at the first button press, then

' delay approximately one second (200 x 5 ms PAUSE) before auto-repeating

' at a rate of approximately 100 ms (5 x 20 ms). Feel free to modify the

' program to see the effects of your changes on the way BUTTON responds.

' {$STAMP BS1}

' {$PBASIC 1.0}

SYMBOL Btn = 0

SYMBOL btnWrk = B2

Main:

' Try changing the Delay value (200) in BUTTON to see the effect of

' its modes: 0 = no delay; 1-254 = varying delays before auto-repeat;

' 255 = no auto-repeat (only one action per button press)

' The BUTTON instruction will cause the program to branch to

' No_Press unless P0 = 0

PAUSE 5

BUTTON Btn, 0, 200, 20, btnWrk, 0, No_Press

DEBUG "*"

No_Press:

GOTO Main