K
kd6532
- Jan 1, 1970
- 0
I'm designing a circuit, wherein I'm trying to use a 555 operating in
monostable mode to turn on an array of sensors for about one second.
I've chosen by exernal R (10k) and C(100u) accordingly. My trouble is
with the triggering. My triggering will be coming from a close contact
that will be closed for a long period of time, opened for a unknown
amount of time, and closed again. I need the 555 to output the 1
second pulse when the switch closed (it's imperative). What would be
the easiest method to do this, while consuming the least amount of
current. Some kind of positive edge triggered component, RC network,
etc.? One problem is that the input triggering pulse must typically be
smaller than the output, which is a problem since the door is opened
for an unknown amount of time.
Thanks.
Kris
monostable mode to turn on an array of sensors for about one second.
I've chosen by exernal R (10k) and C(100u) accordingly. My trouble is
with the triggering. My triggering will be coming from a close contact
that will be closed for a long period of time, opened for a unknown
amount of time, and closed again. I need the 555 to output the 1
second pulse when the switch closed (it's imperative). What would be
the easiest method to do this, while consuming the least amount of
current. Some kind of positive edge triggered component, RC network,
etc.? One problem is that the input triggering pulse must typically be
smaller than the output, which is a problem since the door is opened
for an unknown amount of time.
Thanks.
Kris