Best way to use DC current rise as off switch?

On Wed, 26 Feb 2014 09:03:53 -0800, etpm@whidbey.com wrote:

On Wed, 26 Feb 2014 07:40:45 -0700, Jim Thompson
To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote:

On Wed, 26 Feb 2014 15:33:02 +1100, John G <greentest@ozemail.com.au
wrote:

etpm@whidbey.com laid this down on his screen :
My car has the feature on the driver's side electric window that
lowers the window automatically if the switch is pressed hard enough.
However, none of the other windows has this feature and nor does this
feature work in reverse, raising the window. So I was thinking that I
could use a 555 circuit that would sense the switch being on and after
it was on for a few seconds the timer would keep the window motor
energized until power was removed. So I built the timer circuit but
now need some way to shut the thing off and all I can think of is some
sort of current sensing switch that would turn off the power when the
current rose to a certain point. For the driver's side window I could
use whatever is there for the down motion but that won't work for any
of the other windows. Anybody have any advice? I'm gonna search the
web too but I value the instruction I have received here in the past.
Thanks,
Eric

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The window switches were designed that way to protect your children
from your stupidity.
You might also notice that to get the windows to go UP you have to hold
the switch UP
Early on there were some injuries from putting objects on the up end of
the switch then they were changed so you had to hold them up to close
the window.

Darwin is looking for candidates for this years award :-?

My Q45 has the driver's side with both automatic full open _or_
closed, but all the others require holding the button while traveling
up.

...Jim Thompson
Since children won't be driving my car maybe I'll just stick with the
driver's side window. But what about protection from two children?
What if a 6 year old kid puts his 2 year old sibling's neck in the
window and rolls it up? Maybe I better pay someone to put manual
cranks in the car.
Eric
Click to expand...

---
A malevolent six year old can't turn a crank???

John Fields
 
On 2014-02-27, John Fields <jfields@austininstruments.com> wrote:
Since children won't be driving my car maybe I'll just stick with the
driver's side window. But what about protection from two children?
What if a 6 year old kid puts his 2 year old sibling's neck in the
window and rolls it up? Maybe I better pay someone to put manual
cranks in the car.
Eric

---
A malevolent six year old can't turn a crank???
Click to expand...

Yes, but it can be designed not to provide a mechanical advantage over
bare fingers. :)
 
On Thu, 27 Feb 2014 05:08:09 -0600, John Fields
<jfields@austininstruments.com> wrote:

On Wed, 26 Feb 2014 09:03:53 -0800, etpm@whidbey.com wrote:

On Wed, 26 Feb 2014 07:40:45 -0700, Jim Thompson
To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote:

On Wed, 26 Feb 2014 15:33:02 +1100, John G <greentest@ozemail.com.au
wrote:

etpm@whidbey.com laid this down on his screen :
My car has the feature on the driver's side electric window that
lowers the window automatically if the switch is pressed hard enough.
However, none of the other windows has this feature and nor does this
feature work in reverse, raising the window. So I was thinking that I
could use a 555 circuit that would sense the switch being on and after
it was on for a few seconds the timer would keep the window motor
energized until power was removed. So I built the timer circuit but
now need some way to shut the thing off and all I can think of is some
sort of current sensing switch that would turn off the power when the
current rose to a certain point. For the driver's side window I could
use whatever is there for the down motion but that won't work for any
of the other windows. Anybody have any advice? I'm gonna search the
web too but I value the instruction I have received here in the past.
Thanks,
Eric

---
This email is free from viruses and malware because avast! Antivirus
protection is active. http://www.avast.com

The window switches were designed that way to protect your children
from your stupidity.
You might also notice that to get the windows to go UP you have to hold
the switch UP
Early on there were some injuries from putting objects on the up end of
the switch then they were changed so you had to hold them up to close
the window.

Darwin is looking for candidates for this years award :-?

My Q45 has the driver's side with both automatic full open _or_
closed, but all the others require holding the button while traveling
up.

...Jim Thompson
Since children won't be driving my car maybe I'll just stick with the
driver's side window. But what about protection from two children?
What if a 6 year old kid puts his 2 year old sibling's neck in the
window and rolls it up? Maybe I better pay someone to put manual
cranks in the car.
Eric

---
A malevolent six year old can't turn a crank???

John Fields
Click to expand...
I suppose, but it would take more effort and time to hold the
screaming 2 year old in the opening while cranking than it would to
just hit the automatic button for a couple seconds.
ERS

---
This email is free from viruses and malware because avast! Antivirus protection is active.
http://www.avast.com
 
On Thu, 27 Feb 2014 09:37:09 -0800, etpm@whidbey.com wrote:

On Thu, 27 Feb 2014 05:08:09 -0600, John Fields
jfields@austininstruments.com> wrote:

On Wed, 26 Feb 2014 09:03:53 -0800, etpm@whidbey.com wrote:

On Wed, 26 Feb 2014 07:40:45 -0700, Jim Thompson
To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote:

On Wed, 26 Feb 2014 15:33:02 +1100, John G <greentest@ozemail.com.au
wrote:

etpm@whidbey.com laid this down on his screen :
My car has the feature on the driver's side electric window that
lowers the window automatically if the switch is pressed hard enough.
However, none of the other windows has this feature and nor does this
feature work in reverse, raising the window. So I was thinking that I
could use a 555 circuit that would sense the switch being on and after
it was on for a few seconds the timer would keep the window motor
energized until power was removed. So I built the timer circuit but
now need some way to shut the thing off and all I can think of is some
sort of current sensing switch that would turn off the power when the
current rose to a certain point. For the driver's side window I could
use whatever is there for the down motion but that won't work for any
of the other windows. Anybody have any advice? I'm gonna search the
web too but I value the instruction I have received here in the past.
Thanks,
Eric

---
This email is free from viruses and malware because avast! Antivirus
protection is active. http://www.avast.com

The window switches were designed that way to protect your children
from your stupidity.
You might also notice that to get the windows to go UP you have to hold
the switch UP
Early on there were some injuries from putting objects on the up end of
the switch then they were changed so you had to hold them up to close
the window.

Darwin is looking for candidates for this years award :-?

My Q45 has the driver's side with both automatic full open _or_
closed, but all the others require holding the button while traveling
up.

...Jim Thompson
Since children won't be driving my car maybe I'll just stick with the
driver's side window. But what about protection from two children?
What if a 6 year old kid puts his 2 year old sibling's neck in the
window and rolls it up? Maybe I better pay someone to put manual
cranks in the car.
Eric

---
A malevolent six year old can't turn a crank???

John Fields
I suppose, but it would take more effort and time to hold the
screaming 2 year old in the opening while cranking than it would to
just hit the automatic button for a couple seconds.
ERS
Click to expand...

---
Then, by all means, dumb down.
 
On Thu, 27 Feb 2014 17:07:45 +0000 (UTC), Kaz Kylheku
<kaz@kylheku.com> wrote:

On 2014-02-27, John Fields <jfields@austininstruments.com> wrote:
Since children won't be driving my car maybe I'll just stick with the
driver's side window. But what about protection from two children?
What if a 6 year old kid puts his 2 year old sibling's neck in the
window and rolls it up? Maybe I better pay someone to put manual
cranks in the car.
Eric

---
A malevolent six year old can't turn a crank???

Yes, but it can be designed not to provide a mechanical advantage over
bare fingers. :)
Click to expand...

---
Show how?
 
John Fields wrote:
Jim Thompson wrote:

I'm a great fan of Darwin. I wish he'd stop hiding out and laughing,
and come forth and do something >:-}

He works in the background, slowly winnowing the herd...
Click to expand...

He needs to put on a full second shift, and maybe a third. They are
breeding too fast. :(


--
Anyone wanting to run for any political office in the US should have to
have a DD214, and a honorable discharge.
 
etpm@whidbey.com wrote:
My car has the feature on the driver's side electric window that
lowers the window automatically if the switch is pressed hard enough.
However, none of the other windows has this feature and nor does this
feature work in reverse, raising the window. So I was thinking that I
could use a 555 circuit that would sense the switch being on and after
it was on for a few seconds the timer would keep the window motor
energized until power was removed. So I built the timer circuit but
now need some way to shut the thing off and all I can think of is some
sort of current sensing switch that would turn off the power when the
current rose to a certain point. For the driver's side window I could
use whatever is there for the down motion but that won't work for any
of the other windows. Anybody have any advice? I'm gonna search the
web too but I value the instruction I have received here in the past.
Click to expand...

What I would try is this-

Find a low resistance resistor and put it across the windings of a 6 volt
or even 5 volt small signal relay. Tune it so the stall current from the
window regulator is enough to trigger the relay's NO contact, this would
then reset or stop your timer circuit. That's two parts, unless you
parallel resitors to get things just right.
 
On Wed, 26 Feb 2014 21:16:40 +0000 (UTC), Cydrome Leader
<presence@MUNGEpanix.com> wrote:

etpm@whidbey.com wrote:
My car has the feature on the driver's side electric window that
lowers the window automatically if the switch is pressed hard enough.
However, none of the other windows has this feature and nor does this
feature work in reverse, raising the window. So I was thinking that I
could use a 555 circuit that would sense the switch being on and after
it was on for a few seconds the timer would keep the window motor
energized until power was removed. So I built the timer circuit but
now need some way to shut the thing off and all I can think of is some
sort of current sensing switch that would turn off the power when the
current rose to a certain point. For the driver's side window I could
use whatever is there for the down motion but that won't work for any
of the other windows. Anybody have any advice? I'm gonna search the
web too but I value the instruction I have received here in the past.

What I would try is this-

Find a low resistance resistor and put it across the windings of a 6 volt
or even 5 volt small signal relay. Tune it so the stall current from the
window regulator is enough to trigger the relay's NO contact, this would
then reset or stop your timer circuit. That's two parts, unless you
parallel resitors to get things just right.
Click to expand...
Your idea sounds good to me. Simple and robust. So I guess I need a
resistor relay combination where the relay coil draws little current
and the resistor doesn't use much current before the relay pulls in.
Thanks,
Eric

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