Re: Help - timing and switching circuit needed
- From: Steve Newport <steven@xxxxxxxxxxxxxxxxxxxxx>
- Date: Mon, 02 Apr 2007 17:52:00 GMT
On Thu, 29 Mar 2007 10:13:33 -0700, Donald <Donald@xxxxxxxxxxxxxxxx>
wrote:
Steve Newport wrote:
Steve Newport wrote:
Hello all,
I am trying to find out how to build (sorry am a relative amature) a
timing and switching circuit. The basics are as follows:
Operates off a 12v dc battery
operates (single pulse) up to eight 12v dc solenoids.
sequence of operation is set
timing between each operation could vary in the range 12-48 hours
Can anybody help?
Do you mean that solenoid 1 operates, then 12-48 hours
later solenoid 2 operates, then 12-48 hours later
solenoid 3 operates, etc?
Ed
Yep, a couple of places in the sequence more than one solenoid may
operate but essentialy yes.
Ok, a long duration sequencer.
What is the "single pulse" ??
Any microcontroller chip with a RTC (real time clock) chip and a relay
driver chip can do this.
Are you looking at "building this yourself" by,
a) buying computer/logic boards and programming them yourself.
b) building your computer/logic PCBs and soldering the chips down
yourself then programming them.
or
c) buying a complete system that can control relays with a "single pulse"
How much of "build it" are you interested in doing ??
donald
Sorry, the description I gave was a bit wooly. The solenoid acts to
open a small catch - all it needs is one pulse to make it pull. ie: No
need for a permanent current to be applied. Hope that makes sense.
Was hoping to do a complete self build but if there is something ready
made then why re0invent the wheel so to speak?
Was hpong that what I need would be some combination of a 555 chip and
relay etc. Wasn't imagining anything like programming as that would
probably be quite beyon my capabilities.
I could cope (just) with buying components and soldering them together
:-(
.
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