three state input
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Posts: 46,084
I'm trying to monitor an input with three states, on(normal), flashing(error),
and off(loss of power, or just turned off) with my bs2. I'm thinking that either
the count or rctime instruction will work.
For the count instruction, I'd use debug to see what count returns for the
flashing state. Then for any count below the flashing rate, then read the
current state of the pin.
For RCtime, use a cap to even out the flashing to become one voltage level,
off being and on being their own voltage level. For a total of three voltage
level.
I'm trying to monitor an LED output from my automatic catbox. The LED don't
work anymore, but the output does. Do I have to isolate the two circuits, the
catbox and the bs2? If so, is it ok to tie the ground of both circuits together?
Linux user #228897 computer #109948
website http://www.capdiamont.com
[noparse][[/noparse]Non-text portions of this message have been removed]
and off(loss of power, or just turned off) with my bs2. I'm thinking that either
the count or rctime instruction will work.
For the count instruction, I'd use debug to see what count returns for the
flashing state. Then for any count below the flashing rate, then read the
current state of the pin.
For RCtime, use a cap to even out the flashing to become one voltage level,
off being and on being their own voltage level. For a total of three voltage
level.
I'm trying to monitor an LED output from my automatic catbox. The LED don't
work anymore, but the output does. Do I have to isolate the two circuits, the
catbox and the bs2? If so, is it ok to tie the ground of both circuits together?
Linux user #228897 computer #109948
website http://www.capdiamont.com
[noparse][[/noparse]Non-text portions of this message have been removed]
Comments
The best way is to use an optocoupler.
First, this repairs your catbox circuitry in that the LED current flows
again (there
may be a feedback circuitry that uses this current). Secondly, the open
collector
output of the optocoupler can be tied directly to a stamp pin and a pullup
resistor.
Third: there is no change voltages higher than 5V can reach the stamp.
regards peter
Oorspronkelijk bericht
Van: capdiamont [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=bvKImz3-7eNkDoeow5X0Z5Y8qL8wNTcpn5XmfN1T8cz8wJITUqtMcsVhh0owomHxW0flHTuUzxFDvA]capdiamont@m...[/url
Verzonden: dinsdag 25 september 2001 05:48
Aan: basicstamps@yahoogroups.com
Onderwerp: [noparse][[/noparse]basicstamps] three state input
I'm trying to monitor an input with three states, on(normal),
flashing(error), and off(loss of power, or just turned off) with my bs2. I'm
thinking that either the count or rctime instruction will work.
For the count instruction, I'd use debug to see what count returns for
the flashing state. Then for any count below the flashing rate, then read
the current state of the pin.
For RCtime, use a cap to even out the flashing to become one voltage
level, off being and on being their own voltage level. For a total of three
voltage level.
I'm trying to monitor an LED output from my automatic catbox. The LED
don't work anymore, but the output does. Do I have to isolate the two
circuits, the catbox and the bs2? If so, is it ok to tie the ground of both
circuits together?
Linux user #228897 computer #109948
website http://www.capdiamont.com
[noparse][[/noparse]Non-text portions of this message have been removed]
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