one button, multi LED control help...newb

T.Ellis

I have a project i'm working on. I want one button to be able to toggle 3 lights. When button is pushed first time led 1 comes on, then on second push led 1 of then 2 on, then led 2 off led 3 on, then led 2 and 3 on, then back to 1.

I know how to toggle one led jusst need to understand how to go through al 3. If any one can provide some input or some sample codes it would greatly be appreciated.

Thanks
Trae

Andy Lindsay (Parallax)

Declare a variable and add 1 to it each time the button is been pressed.

Use either IF...THEN of SELECT...CASE statements to decide which LED to turn on based on the variables value.

When the value gets to 5, remember to set it to 0 again so that the sequence is repeated as you continue to press/release the button.

Chris Savage

Another possibility would be to put the values in binary in a DATA table and read through them sequentially with each press of the button.· Each time you output the binary data to a port and increment the counter.

Your DATA table could look like:

DATA %001, %010, %100, %110

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Chris Savage
Parallax Tech Support
csavage@parallax.com

Jon Williams

You can use LOOKUP too -- see, PBASIC is very flexible.

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Jon Williams
Applications Engineer, Parallax

jeremya

Here is what I came up with:

counter VAR Word
counter = 0

DO

IF (IN3 = 1) THEN
  counter = counter + 1
  PAUSE 250
ENDIF

SELECT counter
  CASE = 1
    HIGH 15
  CASE = 2
    LOW 15
    HIGH 14
  CASE = 3
    LOW 14
    HIGH 13
  CASE = 4
    LOW 13
    counter = 0
ENDSELECT

LOOP

-- Jeremy

T.Ellis

Thanks alot for the help. I think I'll be able to manage with the IF THEN with the variable.
Thanks for the example code Jeremy I had come up with something simular after I got the info from Andy.

Thanks Again
Trae