J
Jim
- Jan 1, 1970
- 0
I have been using a digital still camera to take time-lapse photos....one
photo every 60 seconds. I built a timer using a 555 which uses pin 3 (out)
to activate a small 5 volt relay with a diode across the coil. The camera
originally ran on 4 AA cells, but a 6v gell cell now powers the works.
This camera is triggered via a simple pushbutton switch which I soldered
wires onto that go to the relay. (the camera does not go to sleep in this
short of time)
Appearently this all draws more current than I would think 'cause my gell
cell barely lasts 6 or 7 hours before running out of voltage and the camera
shuts down.
So in an effort to reduce total current draw, the 555 is being replaced with
a 7555, and in the same vain, I now think I should be replacing the relay
with an optocoupler of some kind.
The 7555 easily lights an LED (for the 0.5 second or so trigger time), but I
am not up on all the different opto's enough to know what to pick to act
like a button push to my camera.
I would like a suggestion or 2 on where to start here, even some part
numbers if someone has already done this.
Thanks
Jim
photo every 60 seconds. I built a timer using a 555 which uses pin 3 (out)
to activate a small 5 volt relay with a diode across the coil. The camera
originally ran on 4 AA cells, but a 6v gell cell now powers the works.
This camera is triggered via a simple pushbutton switch which I soldered
wires onto that go to the relay. (the camera does not go to sleep in this
short of time)
Appearently this all draws more current than I would think 'cause my gell
cell barely lasts 6 or 7 hours before running out of voltage and the camera
shuts down.
So in an effort to reduce total current draw, the 555 is being replaced with
a 7555, and in the same vain, I now think I should be replacing the relay
with an optocoupler of some kind.
The 7555 easily lights an LED (for the 0.5 second or so trigger time), but I
am not up on all the different opto's enough to know what to pick to act
like a button push to my camera.
I would like a suggestion or 2 on where to start here, even some part
numbers if someone has already done this.
Thanks
Jim