Re: 555 timer circuits for digital camera trigger
- From: default <default@xxxxxxxxxxxxx>
- Date: Mon, 29 Sep 2008 08:48:03 -0400
On Sun, 28 Sep 2008 19:24:48 -0700 (PDT), DorkyGrin
<jchickering@xxxxxxxxx> wrote:
I've got a digital camera that I am trying to connect to a motion
sensor. I've disassembled it and have the wires available to wire into
a circuit. I have three relays. I need a circuit to trigger the camera
in this fashion:
1. Receive signal, activate Relay A and hold for 10 seconds
2. Same signal, after a couple of seconds, activates Relay B for 5
seconds
3. Same signal, after a couple of seconds, activates Relay C for 2
seconds
4. Then reset all relays for next event
These steps simulate Power, Focus and Shutter.
It's been awhile since I've worked with 555 timers, but I think tying
them together in a circuit might be the simplest way to make this
happen. I believe a 555 timer configured as a monostable one-shot
could be used for Relay A. What I'm not sure about is steps 2 and 3,
maybe a 556 timer that has some sort of startup delay?
Or would this project be easier with some sort of PIC?
Open to ideas.
Thanks
Picaxe to the rescue! Check them out. The 8/14/20 pin basic (M
series) versions only require a serial port or usb to serial cable to
program.
The basic language software is free. The parts go for ~$3-4. They are
a snap to use - almost no learning curve. A/D converters with 8 or 10
bit resolution, PWM output, runs on 2-5 volts in the microamp range.
I'm using them for time lapse cameras among other things. It sits
there waiting for the sun to come up, then snaps pictures at an
adjustable interval (using a pot). All the timing is done in the
'axe. I even count the pictures and slightly lengthen the time the
camera stays on, so they get into memory - as the card fills up the
camera needs more time. Camera runs for 10+ days and takes 1,000+
shots in high res JPG format - 0n 3 AA rechargeable cells (3.6V).
I'm using one 8 pin version on one camera and one 14 pin chip on
another. Pins are assignable as input or output. The 14 and 20 still
have assignable pins but they default to inputs or outputs without a
program command.
They sell all kinds of fancy hardware but all you really need is the
PC and serial cable or USB adaptor and three resistors to program it.
A solder less breadboard is nice too.
Use 4.5 volts - they are damned serious about the 5 volt absolute
maximum and batteries are convenient. Anderson (below) is probably
still including programming resistors with the purchase of the 'axe.
Official site (download software and manuals)
http://www.rev-ed.co.uk/picaxe/
Best cheapest fastest place to get them in the US
http://www.phanderson.com/picaxe/index.html
another good fast inexpensive
http://www.sparkfun.com/commerce/product_info.php?products_id=8322
The forum - these guys can answer most any question you have and the
manufacturer monitors and participates
http://www.picaxeforum.co.uk/forumdisplay.php?f=2
--
----== Posted via Pronews.Com - Unlimited-Unrestricted-Secure Usenet News==----
http://www.pronews.com The #1 Newsgroup Service in the World! >100,000 Newsgroups
---= - Total Privacy via Encryption =---
.
- Follow-Ups:
- Re: 555 timer circuits for digital camera trigger
- From: DorkyGrin
- Re: 555 timer circuits for digital camera trigger
- References:
- 555 timer circuits for digital camera trigger
- From: DorkyGrin
- 555 timer circuits for digital camera trigger
- Prev by Date: Re: 555 timer circuits for digital camera trigger
- Next by Date: A community for disabled
- Previous by thread: Re: 555 timer circuits for digital camera trigger
- Next by thread: Re: 555 timer circuits for digital camera trigger
- Index(es):
Relevant Pages
|
