turn led on and off

Rutcgr18 · 2008-12-25 20:47

I want to to make a simple way to turn on and off a led.· I am just learing.· I can turn it on wiht an if statement but i want to shut it off with the same button.· I would like it so you have to hold the button to turn it off.·
Thanks
Mike

Rutcgr18 · 2008-12-25 21:26

if the button is hit onces it turns led on. Then if the button is held for more than x seconds it will shut the led off

Mike Green · 2008-12-25 21:41

Can you write a program that is a "push on" / "push off"? That's the first step you need to learn how to do.

If you can't do that yet, how about a program with two buttons (on two I/O pins) where one button turns the LED on and the other button turns it off?

William Brown · 2008-12-25 22:19

Your if statement can be something like (pseudo code):

main loop of program
if button pressed then gosub buttonpress
end main loop

buttonpress:
if int_of_led_pin = 1 then 'Check the pin to see if it's "on" (high)
low pin 'if it is, turn it off
else
high pin 'if it's not, turn it on
endif
end sub

Rutcgr18 · 2008-12-25 22:46

Mike Green said...
Can you write a program that is a "push on" / "push off"? That's the first step you need to learn how to do.

If you can't do that yet, how about a program with two buttons (on two I/O pins) where one button turns the LED on and the other button turns it off?

I can do the two button setup already.· I just dont know how to use the count fuctiuon.· I am assuming i can count how long the button is held down

Mike Green · 2008-12-25 23:03

What do you mean by "count function"?

The "push on" / "push off" case uses two "states". These are two separate loops in the program. One is the initial loop where the program waits for the button to be pushed, then lights the LED. The 2nd state is a loop where the program also waits for the button to be pushed, but here it turns the LED off. Once the program turns the LED on, it goes to the start of the 2nd loop (changes state). When the 2nd state loop turns the LED off, it goes to the start of the 1st loop (changes state again). Each state needs to start with a sort of substate where it waits for the button to be released if it's still pushed from the previous action, then a second substate where it waits for the button to be pushed. If you're using the BUTTON statement, this (in a loop) takes care of the two substates.

What sort of states do you think you might need for the "push on" / "push and hold off" situation?

erco · 2008-12-25 23:05

One simple way: use out the TOGGLE command, which makes a high pin low and a low pin high. Then you'll monitor the pushbutton for a press and release sequence, then TOGGLE the LED pin and loop back.

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·"If you build it, they will come."

Rutcgr18 · 2008-12-25 23:33

can anyone give me some sample code for this??

erco · 2008-12-25 23:39

BS1 or BS2?

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·"If you build it, they will come."

Rutcgr18 · 2008-12-25 23:40

bs2

erco · 2008-12-25 23:56

Try this with a pushbutton on pin1 and an LED on pin2:

WAITHIGH: IF IN1=0 THEN WAITHIGH' wait for pin1 to go high (button pushed)
TOGGLE 2' toggle LED
PAUSE 200' debounce delay (adjust this value to suit)
WAITLOW: IF IN1=1 THEN WAITLOW' wait for pin1 to go low (button released)
PAUSE 200' debounce delay
GOTO WAITHIGH' loop back

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·"If you build it, they will come."

Rutcgr18 · 2008-12-26 01:27

That worked perfect.· Now i know how to use toggle.· Also i ment to ask is there a way to tell if a pin is high or low?
Thanks

Post Edited (Rutcgr18) : 12/26/2008 1:36:19 AM GMT

erco · 2008-12-26 01:51

Glad that worked for you.

To answer your last question: Yes, but now you gotta do the legwork! I gave you a Christmas freebie in the spirit of the season, but you would have learned more if you would have dug it up yourself, right? Look up OUTS & INS to answer your question from the WAM book or BS Syntax manual. Cheers!

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·"If you build it, they will come."

Post Edited (erco) : 12/26/2008 2:21:35 AM GMT

Rutcgr18 · 2008-12-26 02:44

thanks
i just came up with this
seems to work
Poweron:
IF (IN3=1) THEN
HIGH 14
PAUSE 250
GOTO Poweroff
ELSE
GOTO Poweron
ENDIF

Poweroff:
IF (IN3=1) THEN
LOW 14
PAUSE 250
GOTO Poweron
ELSE
GOTO Poweroff
ENDIF

Rutcgr18 · 2008-12-26 02:45

i know its a lot but was a good learning for me.
I will look into the out and in.
Thanks for your
help
Mike

erco · 2008-12-26 03:45

Mike: If you just hold your button on permanently, does your LED cycle on & off?

erco

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·"If you build it, they will come."

Rutcgr18 · 2008-12-26 04:38

I am not sure i will have to try that. Ok i know i should know this awsnwer but i dont. Could you explan the diffence from VSS and VDD
THanks
Mike

Mikerocontroller · 2008-12-26 06:37

·· Vdd is the high side of the voltage supply and Vss is the low side.· In the case of the Stamp's requirements Vdd should be 5 volts and no higher.· The Stamp Vss voltage should be 0 and no less than that.

William Brown · 2008-12-26 23:32

I've seen other markings in schematics that I was also curious about. I've concluded that "Vin" is unregulated voltage from the power source. Is this correct? What is Vcc?

allanlane5 · 2008-12-27 00:21

Yes, "Vin" is unregulated voltage from the power source. Vdd is the output of a regulator, on the BS2 that's 5 volts. Vss is "Ground".

Vcc is used in TTL circuitry, where Vdd is used in CMOS circuitry, but basically they mean the same thing in the BS2 world -- regulated +5 volts.

turn led on and off

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