Re: Help - timing and switching circuit needed
- From: ehsjr <ehsjr@xxxxxxxxxxxxxxxx>
- Date: Tue, 03 Apr 2007 04:50:17 GMT
Steve Newport wrote:
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
:-(
There's a kit than can be set up to give you a pulse
every ~22 hours (or less).
http://store.qkits.com/moreinfo.cfm/QK152
You would need to add two circuits: a 4017 counter to
advance to the next solenoid when the kit provides a
pulse, and a solenoid driver circuit that will provide
a pulse to the solenoid. We need to know a couple of
things. How long does the pulse to the solenoid have
to be, at a minimum? How much current does the solenoid
take? Can you build the two additional circuits without
using a kit?
Ed
.
- Follow-Ups:
- Re: Help - timing and switching circuit needed
- From: Steve Newport
- Re: Help - timing and switching circuit needed
- References:
- Re: Help - timing and switching circuit needed
- From: Steve Newport
- Re: Help - timing and switching circuit needed
- Prev by Date: Re: New SED Challenge
- Next by Date: possible to make LED blinker at specific tempos?
- Previous by thread: Re: Help - timing and switching circuit needed
- Next by thread: Re: Help - timing and switching circuit needed
- Index(es):
Relevant Pages
|
