Matronics Email Lists :: View topic

Matronics Email Lists
Web Forum Interface to the Matronics Email Lists

Get Email Distribution Too! FAQ Search Memberlist Usergroups Register

Profile Log in to check your private messages Log in

Timer module

Matronics Email Lists Forum Index -> AeroElectric-List

View previous topic :: View next topic

Author Message

davelammers(at)mchsi.com
Guest

Posted: Sun Jan 21, 2007 8:02 am Post subject: Timer module

Hi Listers,



I'm looking for a module that I can use to turn off courtesy lights 

after a predetermined (setable) period of time, similar to the function 

in your automobile interior lighting.



I would like these courtesy lights to be usable independent of the 

master switch, (i.e.: on an "always hot" bus), however, I want them to 

turn off after a period of time to eliminate the possibility of battery 

drain.



The requirements are:



Input & Output voltage:   12/14v

Output current:   Less than 100 ma.  (Drives several gangs of multiple 

LED's)

Input current:   As required for the output, but must be absolutely ZERO 

in the off state.

Size:    Less than several cubic inches.

Weight:  Not much  (I've found some controllers that would work but they 

are big and hefty).

Activated by momentary on switch.

Optionally, after in the ON state, another press of the momentary ON 

will turn the output OFF.



It seems that such a thing could be found reasonably easy, but I have 

searched and come up with nothing.

I would appreciate your ideas/suggestions.



Thanks in advance.

Dave Lammers

willslau(at)alumni.rice.e
Guest

Posted: Sun Jan 21, 2007 9:10 am Post subject: Timer module

I want one, too! I was just thinking about the same application yesterday

for my baggage comparments.



William Slaughter

RV-8



--

Bret Smith

Joined: 09 Jan 2006
Posts: 178
Location: Mineral Bluff, GA

Posted: Sun Jan 21, 2007 10:27 am Post subject: Timer module

Dave, I'm searching for the same timer module.  I want to actuate it from a

contact switch when the canopy is opened.  I, too, plan to have it drive 3-4

banks of LEDs.



Please let me know if you identify an acceptable module and I will do

likewise.

Bret Smith

RV-9A (91314)

Mineral Bluff, GA

www.FlightInnovations.com



--

_________________
Bret Smith
RV-9A (Emp)

jgarner(at)dslextreme.com
Guest

Posted: Sun Jan 21, 2007 10:50 am Post subject: Timer module

How about using a relay and R-C circuit to time it?  We use similar on

elevators all the time...



+12--|-----||--------------------> leds

     | relay contact

     |

     |

     ----/_-----|----O------------gnd

       switch   |  relay coil

                |

                |-/\/\/\/--|(-----gnd

                 resistor capacitor



When the switch closes it picks the relay, contacts light the led.

Switch opens and RC holds the relay in for a 'while'.



The resistor / capacitor / relay coil resistance sets the timing...



Sorry for the ascii art :} and note that I left out fuses, led

resistors, etc.

Hope this helps, YMMV!!



/Joe

Dave Lammers wrote:

 	  Quote: 	
		   

 <davelammers(at)mchsi.com>

 

 Hi Listers,

 

 I'm looking for a module that I can use to turn off courtesy lights

 after a predetermined (setable) period of time, similar to the function

 in your automobile interior lighting.

 

 I would like these courtesy lights to be usable independent of the

 master switch, (i.e.: on an "always hot" bus), however, I want them to

 turn off after a period of time to eliminate the possibility of battery

 drain.

 

 The requirements are:

 

 Input & Output voltage:   12/14v

 Output current:   Less than 100 ma.  (Drives several gangs of multiple

 LED's)

 Input current:   As required for the output, but must be absolutely ZERO

 in the off state.

 Size:    Less than several cubic inches.

 Weight:  Not much  (I've found some controllers that would work but they

 are big and hefty).

 Activated by momentary on switch.

 Optionally, after in the ON state, another press of the momentary ON

 will turn the output OFF.

 

 It seems that such a thing could be found reasonably easy, but I have

 searched and come up with nothing.

 I would appreciate your ideas/suggestions.

 

 Thanks in advance.

 Dave Lammers

 

 

 

 

 

 

 


	


-- 

-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

Joe Garner                 IASEL-RV 6(at)OAK  aka 'Snoopy'

jgarner(at)elelink.org                           |

jgarner(at)dslextreme.com                .______(o)______.

kc6utr(at)w6pw            www.elelink.org      /   \

-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

bferrell(at)123mail.net
Guest

Posted: Sun Jan 21, 2007 11:14 am Post subject: Timer module

I bought such a module for my aircraft, and though it was a b*$ch to hook up

right, I'm really pleased with the result.  It's called the "lights out"

module.



Here's a similar module, though it's not the one I bought.  Let me know if this

doesn't meet your needs, I have papework on the one I used, but it's at the

hangar.

http://www.webelectricproducts.com/products.htm



Brett



Quoting Bret Smith <smithhb(at)tds.net>:



[quote] 



 Dave, I'm searching for the same timer module.  I want to actuate it from a

 contact switch when the canopy is opened.  I, too, plan to have it drive 3-4

 banks of LEDs.



 Please let me know if you identify an acceptable module and I will do

 likewise.

 Bret Smith

 RV-9A (91314)

 Mineral Bluff, GA

 www.FlightInnovations.com



 --

klehman(at)albedo.net
Guest

Posted: Sun Jan 21, 2007 11:31 am Post subject: Timer module

I'd suggest a solid state device with 4 components such as I use for 

autoshutoff circuits on small battery powered devices such as multimeters.

A switch, mosfet, capacitor, and diode. The switch is the largest component.

You'd perhaps want a larger mosfet but I've used a VN10KM mosfet (radio 

shack 276-2070) good for 0.5amp successfully. It looks like a tiny 

plastic transistor with three leads.

I put the capacitor and diode in parallel from the Source to the gate 

with the banded end of the diode and the + end of the cap connected to 

the Gate. Ground the Source. Your LED's (with current limiting 

resistors) goes between +12 volts and the Drain. Now you can 

momentarilly switch +12volts onto the Gate and the LED's will stay on 

until the charge on the cap bleeds off. As an example I typically get 1 

min. with a .22uf capacitor and 1 hr. with 10uf. Just play with 

capacitor values to get the time that you want.

I like to use a 3 positon switch. Center is normal. Up is on 

continuously but usually I just put it up and immediately back to center 

to let the timer run. Down shorts the cap or discharges it to ground for 

an immediate off. A momentary switch (spring loaded to center) or just a 

push button will also work well.

Ken

Joe Garner wrote:

 	  Quote: 	

How about using a relay and R-C circuit to time it?  We use similar on

elevators all the time...

+12--|-----||--------------------> leds

     | relay contact

     |

     |

     ----/_-----|----O------------gnd

       switch   |  relay coil

                |

                |-/\/\/\/--|(-----gnd

                 resistor capacitor

When the switch closes it picks the relay, contacts light the led.

Switch opens and RC holds the relay in for a 'while'.

The resistor / capacitor / relay coil resistance sets the timing...

Sorry for the ascii art :} and note that I left out fuses, led

resistors, etc.

Hope this helps, YMMV!!

/Joe

Dave Lammers wrote:

>

><davelammers(at)mchsi.com>

>

>Hi Listers,

>

>I'm looking for a module that I can use to turn off courtesy lights

>after a predetermined (setable) period of time, similar to the function

>in your automobile interior lighting.

>

>I would like these courtesy lights to be usable independent of the

>master switch, (i.e.: on an "always hot" bus), however, I want them to

>turn off after a period of time to eliminate the possibility of battery

>drain.

>

>The requirements are:

>

>Input & Output voltage:   12/14v

>Output current:   Less than 100 ma.  (Drives several gangs of multiple

>LED's)

>Input current:   As required for the output, but must be absolutely ZERO

>in the off state.

>Size:    Less than several cubic inches.

>Weight:  Not much  (I've found some controllers that would work but they

>are big and hefty).

>Activated by momentary on switch.

>Optionally, after in the ON state, another press of the momentary ON

>will turn the output OFF.

>

>It seems that such a thing could be found reasonably easy, but I have

>searched and come up with nothing.

>I would appreciate your ideas/suggestions.

>

>Thanks in advance.

>Dave Lammers

>

>    

>

lerohl(at)rea-alp.com
Guest

Posted: Sun Jan 21, 2007 11:35 am Post subject: Timer module

Check precisiontimer.com .  They have compact modules, about 4 oz.



Regards,

Gaylen Lerohl

Terminaltown.com

---

nuckollsr(at)cox.net
Guest

Posted: Sun Jan 21, 2007 12:31 pm Post subject: Timer module

At 10:01 AM 1/21/2007 -0600, you wrote:



 	  Quote: 	
		  



Hi Listers,



I'm looking for a module that I can use to turn off courtesy lights after 

a predetermined (setable) period of time, similar to the function in your 

automobile interior lighting.



I would like these courtesy lights to be usable independent of the master 

switch, (i.e.: on an "always hot" bus), however, I want them to turn off 

after a period of time to eliminate the possibility of battery drain.



The requirements are:



Input & Output voltage:   12/14v

Output current:   Less than 100 ma.  (Drives several gangs of multiple LED's)

Input current:   As required for the output, but must be absolutely ZERO 

in the off state.

Size:    Less than several cubic inches.

Weight:  Not much  (I've found some controllers that would work but they 

are big and hefty).

Activated by momentary on switch.

Optionally, after in the ON state, another press of the momentary ON will 

turn the output OFF.


	


   That is one of the products we're developing that will fit into

   our standard A enclosure. You can see the package at:



http://www.aeroelectric.com/Pictures/Products/Enclosures/A_Enclosure.pdf



   Weight on this puppy is about 3 oz.



   It will have an externally programmable time delay ranging from

   10 to 1000 seconds. It can be externally strapped to default

   ON or default OFF at power up. Will handle 5 amp loads. External

   controls are a steady pull to ground which initiates an ON

   cycle limited to 1000 seconds. A momentary pull to ground on same

   line initiates an ON-cycle for the programmed limit. A pull-to-ground

   either momentary or continuous for OFF. If momentary (normally

   open) then the system will default according to the strapping

   on power up. If continuously held to ground, the system is OFF

   under all conditions including right after power up.



   This will be our 9024-100-1 On Limit Timer to be on the website

   sometime this year. In the mean time, if you're of a notion to

   roll-yer-own, consider the schematic at



http://www.aeroelectric.com/Pictures/Schematics/On_Limit_Timer.pdf



   Parts are available from Digikey and while it doesn't have the

   software driven features of control logic cited for the 9024,

   it may well do what you need done. This defaults off on power up.

   Momentary pull down to ground initiates a timed ON function, a

   momentary pull down shuts the load off.



 	  Quote: 	
		  It seems that such a thing could be found reasonably easy, but I have 

searched and come up with nothing.

I would appreciate your ideas/suggestions.


	


   There are dozens of ways to skin this cat . . . here

   are a few.



   Bob . . .

      ---------------------------------------------------------

      < What is so wonderful about scientific truth...is that >

      < the authority which determines whether there can be   >

      < debate or not does not reside in some fraternity of   >

      < scientists; nor is it divine. The authority rests     >

      < with experiment.                                      >

      <                            --Lawrence M. Krauss       >

      ---------------------------------------------------------

gregcampbellusa(at)gmail.
Guest

Posted: Mon Jan 22, 2007 5:09 am Post subject: Timer module

I went to Home Depot and got a wind up timer switch for $9.

 It weighs 4.1 oz and is rated for 20A (at) 125 Vac or a 1HP motor.

 They sell a 0-60 minute version and a 0-12 hour version.

  

 It's a little bulky behind the panel, but the knob on the front is small, sturdy, 

 and intuitive.  You wind it up and you've got lights for 0 to 60 minutes.

 It even has an audible reminder that the courtesy lights are on!

 (It goes "ticka-ticka-ticka"  

  

 I found a piece of "nearly useless" panel space near the upper left of my panel

 that had very little room behind it and was otherwise hard to get to - 

 but it's perfect for the timer.  It's easy to reach immediately after opening 

 the door at night to start a preflight.  It also makes a decent backup light & timer.

  

 I like the high tech stuff too, but this low tech "turn past 10" gizmo

 filled the bill nicely for under $10.  

  

 Greg

  [quote][b]

mjurotich(at)hst.nasa.gov
Guest

Posted: Mon Jan 22, 2007 5:23 am Post subject: Timer module

Bob



Could you put the schematic and a parts list for the on-limit timer 

in a more readable format.  I am having difficulty reading some of 

the parts and have to make assumptions such as the left most caps are 

0.1 mircrofarrads and and V1A is same part as V1B and V1C and there 

is a floating symbol that does not make sense to me.



Thanks



Matthew M. Jurotich



e-mail   mail to: <mjurotich(at)hst.nasa.gov>

phone   : 301-286-5919

nuckollsr(at)cox.net
Guest

Posted: Mon Jan 22, 2007 6:36 am Post subject: Timer module

At 08:21 AM 1/22/2007 -0500, you wrote:



 	  Quote: 	
		  

<mjurotich(at)hst.nasa.gov>



Bob



Could you put the schematic and a parts list for the on-limit timer in a 

more readable format.  I am having difficulty reading some of the parts 

and have to make assumptions such as the left most caps are 0.1 

mircrofarrads and and V1A is same part as V1B and V1C and there is a 

floating symbol that does not make sense to me.


	




   Look up the CD4093 integrated circuit. It has 4 sections

   of which only three are used and the forth is "tied off".



   The caps are either 0.1 uF and 10 uF except the

   timing cap which may be 10 to 47 uF set by experiment

   to achieve desired time delay.



   The resistors are 1K, 100 ohms, 470 ohms, and 100K

   except for the time-adjust resistor which you'll

   have to experiment with to achieve the desired

   time delay.



   Bob . . .



      ---------------------------------------------------------

      < What is so wonderful about scientific truth...is that >

      < the authority which determines whether there can be   >

      < debate or not does not reside in some fraternity of   >

      < scientists; nor is it divine. The authority rests     >

      < with experiment.                                      >

      <                            --Lawrence M. Krauss       >

      ---------------------------------------------------------

plaurence

Joined: 22 May 2006
Posts: 15

Posted: Tue Jan 23, 2007 5:06 pm Post subject: Timer module

Dave, Here's another way to skin this cat.

Check out :



http://www.uoguelph.ca/~antoon/circ/relay1h.html



Peter

_________________
Peter Laurence
RV9A Fuse

trigo(at)mail.telepac.pt
Guest

Posted: Wed Jan 24, 2007 8:12 am Post subject: Timer module

Peter



Very nice and very useful this site you indicated, with plenty of projects 

to exercise your electronic circuit building skills.



Carlos

Do not archive



---

trigo(at)mail.telepac.pt
Guest

Posted: Wed Jan 24, 2007 9:12 am Post subject: Timer module

In the circuit design shown in



 	  Quote: 	
		  

 http://www.uoguelph.ca/~antoon/circ/relay1h.html




	


 the power source is indicated at 9 V.

Please forgive an electronics ignorant question, but what should be done to 

connect this circuit to 12/14 V ?



Carlos

plaurence

Joined: 22 May 2006
Posts: 15

Posted: Wed Jan 24, 2007 7:21 pm Post subject: Timer module

Carlos,



Here is one way of regulating the 9 volts. See:

http://www.uoguelph.ca/~antoon/circ/ps-lm317.html

Peter

In the circuit design shown in



 	  Quote: 	
		  

 http://www.uoguelph.ca/~antoon/circ/relay1h.html




	


 the power source is indicated at 9 V.

Please forgive an electronics ignorant question, but what should be done to 

connect this circuit to 12/14 V ?



Carlos

_________________
Peter Laurence
RV9A Fuse

retasker(at)optonline.net
Guest

Posted: Wed Jan 24, 2007 8:34 pm Post subject: Timer module

Probably nothing.  The LMC555 is rated to 15V.  The characteristic of 

the 555 series is that the timing is relatively insensitive to the 

supply voltage.  If you run it from 12-14V you will have to choose a 

relay that is rated at more than the 6V the schematic shows and has a 

resistance of 1000 ohms or more.  Depending on what you want to control 

with the relay, you could also use an NPN transistor or FET to control 

the load in place of the relay.

The only weakness in the circuit shown is that if you get transients on 

your aircraft voltage you might destroy the LMC555 - depends on the 

length and voltage of the transient.  You could mitigate this problem 

with a small series resistor and filter capacitor to ground.  If you 

want it to be bulletproof a zener in parallel with the capacitor would 

do it.

I know this might be too much for you to absorb   .  If you have 

other questions, please feel free to ask.

Dick

Carlos Trigo wrote:

 	  Quote: 	

 <trigo(at)mail.telepac.pt>

 In the circuit design shown in

>

> http://www.uoguelph.ca/~antoon/circ/relay1h.html

>

 the power source is indicated at 9 V.

 Please forgive an electronics ignorant question, but what should be 

 done to connect this circuit to 12/14 V ?

 Carlos

-- 

Please Note: 

No trees were destroyed in the sending of this message.  We do concede, however,

that a significant number of electrons may have been temporarily inconvenienced.

--

trigo(at)mail.telepac.pt
Guest

Posted: Thu Jan 25, 2007 5:01 am Post subject: Timer module

Peter, and all electronic experts



Could it be easier (and enough) to replace the Relay (6-9V) of the Timer 

circuit by a 12/14V Relay, and then you already can use it with 12/14V power 

source ?



Carlos

From: "Peter Laurence" <PLaurence(at)the-beach.net>

 	  Quote: 	
		  

 Carlos,



 Here is one way of regulating the 9 volts. See:

 http://www.uoguelph.ca/~antoon/circ/ps-lm317.html

 Peter




	


 	  Quote: 	
		  > In the circuit design shown in

>

> http://www.uoguelph.ca/~antoon/circ/relay1h.html

>

> the power source is indicated at 9 V.

> Please forgive an electronics ignorant question, but what should be done 

> to

> connect this circuit to 12/14 V ?

>

> Carlos

>

trigo(at)mail.telepac.pt
Guest

Posted: Thu Jan 25, 2007 5:18 am Post subject: Timer module

Dick



Thank you very much for your elaborate and knowledgeable answer. I hadn´t 

read it when I put my today's previous post, asking about the substitution 

of the relay.

You´re right that, at this moment, all you explained is "too much for me to 

absorb", at least right away, but since I'm in this group to learn, I will 

try to do exactly that by studying the circuit and your answer, and then 

come back with additional rookie questions. After all, this is nothing but 

the normal process of learning ....



Thanks

Carlos

---

Display posts from previous:

	Matronics Email Lists Forum Index -> AeroElectric-List	All times are GMT - 8 Hours
Page 1 of 1

Jump to:

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum