P
pipco
- Jan 1, 1970
- 0
I've been doing a lot of reading today on 555 timer circuits, and I'm
not sure if this type of circuit is the best for my application. I'm
hoping someone can steer me in the right direction. I originally was
going to try and use a PIC, but I don't really want to invest in a
programmer and although I know I could probably do it that way, I'm
afraid the learning-curve would be beyond what I could handle right
now.
I'm trying to use a timer to turn a small computer fan on for a short
time period and off for a longer time period, then repeat. I'd like it
to be adjustable if possible (both the on and off periods). It would be
something like: on for 1 minute, off for 5.
My goal is to power the whole thing with a 9-volt battery.
I'm not really an electronics guy, although I can build a circuit from
a diagram. I think part of the problem I'm running into is trying to
figure out the values for the resistors and caps.
If someone could either point me to a diagram on the web or can talk me
through some component selections, I would appreciate it.
This is the closest thing I could find:
http://www.zen22142.zen.co.uk/Circuits/Timing/asym.htm
I understand that the time values will be appoximate, I don't need a
ton of accuracy.
Also, if someone thinks this would be better handled by a PIC and wants
to write and program a chip for me, I would be interested!
Thanks in advance...
pip
not sure if this type of circuit is the best for my application. I'm
hoping someone can steer me in the right direction. I originally was
going to try and use a PIC, but I don't really want to invest in a
programmer and although I know I could probably do it that way, I'm
afraid the learning-curve would be beyond what I could handle right
now.
I'm trying to use a timer to turn a small computer fan on for a short
time period and off for a longer time period, then repeat. I'd like it
to be adjustable if possible (both the on and off periods). It would be
something like: on for 1 minute, off for 5.
My goal is to power the whole thing with a 9-volt battery.
I'm not really an electronics guy, although I can build a circuit from
a diagram. I think part of the problem I'm running into is trying to
figure out the values for the resistors and caps.
If someone could either point me to a diagram on the web or can talk me
through some component selections, I would appreciate it.
This is the closest thing I could find:
http://www.zen22142.zen.co.uk/Circuits/Timing/asym.htm
I understand that the time values will be appoximate, I don't need a
ton of accuracy.
Also, if someone thinks this would be better handled by a PIC and wants
to write and program a chip for me, I would be interested!
Thanks in advance...
pip