Detecting if 110VAC device is on or off with BS2
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I'm working on a stamp project that keeps track of when my sump-pump turns
on and off. I'm using a Dallas Semiconductor Real Time Clock to keep
track of time. The sump-pump runs on 110VAC and I'm not sure how to
detect if it is on or off. I'm thinking that I could set up a current
sensing device on one of the power lines going to the sump-pump. Any
ideas on how to do this?
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on and off. I'm using a Dallas Semiconductor Real Time Clock to keep
track of time. The sump-pump runs on 110VAC and I'm not sure how to
detect if it is on or off. I'm thinking that I could set up a current
sensing device on one of the power lines going to the sump-pump. Any
ideas on how to do this?
__________________________________________________
Do You Yahoo!?
Yahoo! Messenger - Talk while you surf! It's FREE.
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Comments
wich would give you an input on the stamp
or have the pump power up the stamp that way it would only be on when the
pump is on but you would have to be carefull with the rest of your circuit.
regards.
victor
Original Message
From: "Freddie Leaf" <freddie_leaf@y...>
To: <basicstamps@egroups.com>
Sent: Sunday, October 22, 2000 1:19 PM
Subject: [noparse][[/noparse]basicstamps] Detecting if 110VAC device is on or off with BS2
> I'm working on a stamp project that keeps track of when my sump-pump turns
> on and off. I'm using a Dallas Semiconductor Real Time Clock to keep
> track of time. The sump-pump runs on 110VAC and I'm not sure how to
> detect if it is on or off. I'm thinking that I could set up a current
> sensing device on one of the power lines going to the sump-pump. Any
> ideas on how to do this?
>
> __________________________________________________
> Do You Yahoo!?
> Yahoo! Messenger - Talk while you surf! It's FREE.
> http://im.yahoo.com/
>
>
>
What's triggering the pump in the first place? ...chances are it could
already be a relay.
>have the pump trigger a relay (solid state)
>wich would give you an input on the stamp
>or have the pump power up the stamp that way it would only be on when the
>pump is on but you would have to be carefull with the rest of your circuit.
>regards.
>victor
>
>
>
>
Original Message
>From: "Freddie Leaf" <freddie_leaf@y...>
>To: <basicstamps@egroups.com>
>Sent: Sunday, October 22, 2000 1:19 PM
>Subject: [noparse][[/noparse]basicstamps] Detecting if 110VAC device is on or off with BS2
>
>
> > I'm working on a stamp project that keeps track of when my sump-pump turns
> > on and off. I'm using a Dallas Semiconductor Real Time Clock to keep
> > track of time. The sump-pump runs on 110VAC and I'm not sure how to
> > detect if it is on or off. I'm thinking that I could set up a current
> > sensing device on one of the power lines going to the sump-pump. Any
> > ideas on how to do this?
> >
> > __________________________________________________
> > Do You Yahoo!?
> > Yahoo! Messenger - Talk while you surf! It's FREE.
> > http://im.yahoo.com/
> >
> >
> >
Beau Schwabe IC Mask Designer
National Semiconductor Network Products Division
500 Pinnacle Court, Suite 525 Mail Stop GA1 Norcross, GA 30071
in the sump-pump pit. The only thing I have access to is the 110VAC pump
power cord going into the pit. I also have access to the pipe containing
the water being pumped out of the pit. I guess I could get a flow meter
but that sound expensive.
--- Beau Schwabe <bschwabe@a...> wrote:
> At 02:14 PM 10/22/00 -0400, you wrote:
>
> What's triggering the pump in the first place? ...chances are it could
> already be a relay.
>
> >have the pump trigger a relay (solid state)
> >wich would give you an input on the stamp
> >or have the pump power up the stamp that way it would only be on when
> the
> >pump is on but you would have to be carefull with the rest of your
> circuit.
> >regards.
> >victor
> >
> >
> >
> >
Original Message
> >From: "Freddie Leaf" <freddie_leaf@y...>
> >To: <basicstamps@egroups.com>
> >Sent: Sunday, October 22, 2000 1:19 PM
> >Subject: [noparse][[/noparse]basicstamps] Detecting if 110VAC device is on or off with BS2
> >
> >
> > > I'm working on a stamp project that keeps track of when my sump-pump
> turns
> > > on and off. I'm using a Dallas Semiconductor Real Time Clock to
> keep
> > > track of time. The sump-pump runs on 110VAC and I'm not sure how to
> > > detect if it is on or off. I'm thinking that I could set up a
> current
> > > sensing device on one of the power lines going to the sump-pump.
> Any
> > > ideas on how to do this?
> > >
> > > __________________________________________________
> > > Do You Yahoo!?
> > > Yahoo! Messenger - Talk while you surf! It's FREE.
> > > http://im.yahoo.com/
> > >
> > >
> > >
>
> Beau Schwabe IC Mask Designer
> National Semiconductor Network Products Division
> 500 Pinnacle Court, Suite 525 Mail Stop GA1 Norcross, GA 30071
>
>
>
>
>
>
>
>
>
>
__________________________________________________
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Yahoo! Messenger - Talk while you surf! It's FREE.
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Original Message
From: "Freddie Leaf" <freddie_leaf@y...>
To: <basicstamps@egroups.com>
Sent: Sunday, October 22, 2000 2:38 PM
Subject: Re: [noparse][[/noparse]basicstamps] Detecting if 110VAC device is on or off with BS2
> The pump is triggered by a float. The pump and float are submerged down
> in the sump-pump pit. The only thing I have access to is the 110VAC pump
> power cord going into the pit. I also have access to the pipe containing
> the water being pumped out of the pit. I guess I could get a flow meter
> but that sound expensive.
>
>
>
> --- Beau Schwabe <bschwabe@a...> wrote:
> > At 02:14 PM 10/22/00 -0400, you wrote:
> >
> > What's triggering the pump in the first place? ...chances are it could
> > already be a relay.
> >
> > >have the pump trigger a relay (solid state)
> > >wich would give you an input on the stamp
> > >or have the pump power up the stamp that way it would only be on when
> > the
> > >pump is on but you would have to be carefull with the rest of your
> > circuit.
> > >regards.
> > >victor
> > >
> > >
> > >
> > >
Original Message
> > >From: "Freddie Leaf" <freddie_leaf@y...>
> > >To: <basicstamps@egroups.com>
> > >Sent: Sunday, October 22, 2000 1:19 PM
> > >Subject: [noparse][[/noparse]basicstamps] Detecting if 110VAC device is on or off with BS2
> > >
> > >
> > > > I'm working on a stamp project that keeps track of when my sump-pump
> > turns
> > > > on and off. I'm using a Dallas Semiconductor Real Time Clock to
> > keep
> > > > track of time. The sump-pump runs on 110VAC and I'm not sure how to
> > > > detect if it is on or off. I'm thinking that I could set up a
> > current
> > > > sensing device on one of the power lines going to the sump-pump.
> > Any
> > > > ideas on how to do this?
> > > >
> > > > __________________________________________________
> > > > Do You Yahoo!?
> > > > Yahoo! Messenger - Talk while you surf! It's FREE.
> > > > http://im.yahoo.com/
> > > >
> > > >
> > > >
> >
> > Beau Schwabe IC Mask Designer
> > National Semiconductor Network Products Division
> > 500 Pinnacle Court, Suite 525 Mail Stop GA1 Norcross, GA 30071
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
>
>
> __________________________________________________
> Do You Yahoo!?
> Yahoo! Messenger - Talk while you surf! It's FREE.
> http://im.yahoo.com/
>
>
>
The 110VAC is run through the float? Usually this is done with a lower
12 or 24 Volt system that energizes a relay to handle the larger voltage
and current demand of a motor.
Anyway, a simple and safe solution would be to get a 110VAC Relay as
mentioned earlier and place it in parallel with the 110VAC motor.
>The pump is triggered by a float. The pump and float are submerged down
>in the sump-pump pit. The only thing I have access to is the 110VAC pump
>power cord going into the pit. I also have access to the pipe containing
>the water being pumped out of the pit. I guess I could get a flow meter
>but that sound expensive.
>
>
>
>--- Beau Schwabe <bschwabe@a...> wrote:
> > At 02:14 PM 10/22/00 -0400, you wrote:
> >
> > What's triggering the pump in the first place? ...chances are it could
> > already be a relay.
> >
> > >have the pump trigger a relay (solid state)
> > >wich would give you an input on the stamp
> > >or have the pump power up the stamp that way it would only be on when
> > the
> > >pump is on but you would have to be carefull with the rest of your
> > circuit.
> > >regards.
> > >victor
> > >
> > >
> > >
> > >
Original Message
> > >From: "Freddie Leaf" <freddie_leaf@y...>
> > >To: <basicstamps@egroups.com>
> > >Sent: Sunday, October 22, 2000 1:19 PM
> > >Subject: [noparse][[/noparse]basicstamps] Detecting if 110VAC device is on or off with BS2
> > >
> > >
> > > > I'm working on a stamp project that keeps track of when my sump-pump
> > turns
> > > > on and off. I'm using a Dallas Semiconductor Real Time Clock to
> > keep
> > > > track of time. The sump-pump runs on 110VAC and I'm not sure how to
> > > > detect if it is on or off. I'm thinking that I could set up a
> > current
> > > > sensing device on one of the power lines going to the sump-pump.
> > Any
> > > > ideas on how to do this?
> > > >
> > > > __________________________________________________
> > > > Do You Yahoo!?
> > > > Yahoo! Messenger - Talk while you surf! It's FREE.
> > > > http://im.yahoo.com/
> > > >
> > > >
> > > >
> >
> > Beau Schwabe IC Mask Designer
> > National Semiconductor Network Products Division
> > 500 Pinnacle Court, Suite 525 Mail Stop GA1 Norcross, GA 30071
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
>
>
>__________________________________________________
>Do You Yahoo!?
>Yahoo! Messenger - Talk while you surf! It's FREE.
>http://im.yahoo.com/
Beau Schwabe IC Mask Designer
National Semiconductor Network Products Division
500 Pinnacle Court, Suite 525 Mail Stop GA1 Norcross, GA 30071
the pipe so there is still a head above it. When the pump is off the water
will drain out of the pipe and there is no pressure. When the pump kicks on
you get the pressure of the head above the switch and the additional
pressure that is requires to overcome the flow resistance in the rest of the
pipe. There are plenty of pressure sensors for $20 or so that would do the
job and if you looked at surplus you could probably find a on-off type
sensor for $5 or so.
Tim
[noparse][[/noparse]Denver, CO]
>
> The pump is triggered by a float. The pump and float are submerged down
> in the sump-pump pit. The only thing I have access to is the 110VAC pump
> power cord going into the pit. I also have access to the pipe containing
> the water being pumped out of the pit. I guess I could get a flow meter
> but that sound expensive.
> The pump is triggered by a float. The pump and float are submerged down
> in the sump-pump pit. The only thing I have access to is the 110VAC pump
> power cord going into the pit. I also have access to the pipe containing
> the water being pumped out of the pit. I guess I could get a flow meter
> but that sound expensive.
>
not really.. talk to marine motor repair shops.. outboard motors are water
cooled, and lots of them have flow switches that warn when the coolant water
has stopped flowing.
Jason
>
> --- Beau Schwabe <bschwabe@a...> wrote:
> > At 02:14 PM 10/22/00 -0400, you wrote:
> >
> > What's triggering the pump in the first place? ...chances are it could
> > already be a relay.
> >
> > >have the pump trigger a relay (solid state)
> > >wich would give you an input on the stamp
> > >or have the pump power up the stamp that way it would only be on when
> > the
> > >pump is on but you would have to be carefull with the rest of your
> > circuit.
> > >regards.
> > >victor
> > >
> > >
> > >
> > >
Original Message
> > >From: "Freddie Leaf" <freddie_leaf@y...>
> > >To: <basicstamps@egroups.com>
> > >Sent: Sunday, October 22, 2000 1:19 PM
> > >Subject: [noparse][[/noparse]basicstamps] Detecting if 110VAC device is on or off with BS2
> > >
> > >
> > > > I'm working on a stamp project that keeps track of when my sump-pump
> > turns
> > > > on and off. I'm using a Dallas Semiconductor Real Time Clock to
> > keep
> > > > track of time. The sump-pump runs on 110VAC and I'm not sure how to
> > > > detect if it is on or off. I'm thinking that I could set up a
> > current
> > > > sensing device on one of the power lines going to the sump-pump.
> > Any
> > > > ideas on how to do this?
> > > >
> > > > __________________________________________________
> > > > Do You Yahoo!?
> > > > Yahoo! Messenger - Talk while you surf! It's FREE.
> > > > http://im.yahoo.com/
> > > >
> > > >
> > > >
> >
> > Beau Schwabe IC Mask Designer
> > National Semiconductor Network Products Division
> > 500 Pinnacle Court, Suite 525 Mail Stop GA1 Norcross, GA 30071
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
>
> __________________________________________________
> Do You Yahoo!?
> Yahoo! Messenger - Talk while you surf! It's FREE.
> http://im.yahoo.com/
group recently.
The circuit is also OK for your goal too.
Attached the file AC_interface.jpg, this schematic is from an european
magazine called "Elektor". Sorry the background of the schematic is not
cleaned it up.
It works fine, and tested again a few days ago with scope:
- 110 AC is applied to a LED of opto across 100k resistor (about 1mA through
the Led), don't forget diode 1N4148 or similar.
- 4N25 opto is little bit better than TIL111.
- Wire 10k as R3 instead of 5k6.
- T1 is general purpose NPN (BC547, 2N2222,...).
- BStamp input in collector of T1.
1/ Without C1 you have a perfect square wave 60Hz (Low state 0v, High state
5v).
2/ With C1 100nF you can detect if AC is applied or not!
Signal is: Low state 0v during 8.3 ms, going from 0 to approximately 0.4v
during 8.3ms. Total cycle 16.6ms for 60Hz.
When AC isn't applied, input on BS2 is 1.
When AC is applied, input on BS2 is 0.
Sorry, I haven't tested any BS2 code about this recently for the 1/ case.
Notice to AC supply: opto is necessary to have insulation with projects.
On schematic given, 2 serial resistors are in use for 230V (resistor is rated
150V). For US 1 resistor 100k is OK, wire 2 of these if you like.
Let me know if you need more, or problem to get attached JPG file.
Have fun in your projects
Christian.
[noparse][[/noparse]Unable to display image]
Original Message
From: Freddie Leaf <freddie_leaf@y...>
To: <basicstamps@egroups.com>
Sent: Sunday, October 22, 2000 2:38 PM
Subject: Re: [noparse][[/noparse]basicstamps] Detecting if 110VAC device is on or off with BS2
> The pump is triggered by a float. The pump and float are submerged down
> in the sump-pump pit. The only thing I have access to is the 110VAC pump
> power cord going into the pit. I also have access to the pipe containing
> the water being pumped out of the pit. I guess I could get a flow meter
> but that sound expensive.
*****************
It does not sound practical to tap into the pump wiring...it is usually all
sealed on a submersible pump. Consider a current sense transformer that
could be installed on an extension line cord. Digikey lists a unit on page
593 of their catalog, #237-1103-ND, $2.89 ea. With a 60 ohm terminating
resistor, it outputs 110 mv/amp, whch would double for a 120 ohm resistor,
(220 mv/amp with 120 ohm). The output could be rectified and conditioned
for Stamp use.
Ray McArthur
Yours and Christian's ideas were really neato.
Ray, can I ask what a terminating resistor is?
You lost me on the "which would double for a 120 ohm" too.
Just stick a 60 ohm or 120 ohm on the outputs of the current sense
transformer and you get some kinda output that you can work with thru a
diode bridge or something?
Anyway, sure enjoy this board.
Mark
Original Message
From: Ray McArthur <rjmca@u...>
To: basicstamps@egroups.com <basicstamps@egroups.com>
Date: Sunday, October 22, 2000 1:52 PM
Subject: Re: [noparse][[/noparse]basicstamps] Detecting if 110VAC device is on or off with BS2
>
Original Message
>From: Freddie Leaf <freddie_leaf@y...>
>To: <basicstamps@egroups.com>
>Sent: Sunday, October 22, 2000 2:38 PM
>Subject: Re: [noparse][[/noparse]basicstamps] Detecting if 110VAC device is on or off with BS2
>
>
>> The pump is triggered by a float. The pump and float are submerged down
>> in the sump-pump pit. The only thing I have access to is the 110VAC pump
>> power cord going into the pit. I also have access to the pipe containing
>> the water being pumped out of the pit. I guess I could get a flow meter
>> but that sound expensive.
>
>*****************
>It does not sound practical to tap into the pump wiring...it is usually all
>sealed on a submersible pump. Consider a current sense transformer that
>could be installed on an extension line cord. Digikey lists a unit on page
>593 of their catalog, #237-1103-ND, $2.89 ea. With a 60 ohm terminating
>resistor, it outputs 110 mv/amp, whch would double for a 120 ohm resistor,
>(220 mv/amp with 120 ohm). The output could be rectified and conditioned
>for Stamp use.
>
>Ray McArthur
>
>
>
>
>
yourself and place around one of the conductors only, Either the active or
neutral (I am a sparky here in Oz and that's what we call them anyway).
Depending on the number of turns and if a former is used etc will cause a
voltage to appear at the coil ends. It's rough but if it serves to work then
perhaps a commercial version could be bought.
Hope this helps....
Original Message
From: Ray McArthur [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=lgHYzg2MUq--Mx70riAa6LrCMENvEKwRfdFtxaM3fZrhiEvctbdtN7obwF39L9fmnHUdDUjfGwXrMTn5F5js]rjmca@u...[/url
Sent: Monday, 23 October 2000 7:00
To: basicstamps@egroups.com
Subject: Re: [noparse][[/noparse]basicstamps] Detecting if 110VAC device is on or off with
BS2
Original Message
From: Freddie Leaf <freddie_leaf@y...>
To: <basicstamps@egroups.com>
Sent: Sunday, October 22, 2000 2:38 PM
Subject: Re: [noparse][[/noparse]basicstamps] Detecting if 110VAC device is on or off with BS2
> The pump is triggered by a float. The pump and float are submerged down
> in the sump-pump pit. The only thing I have access to is the 110VAC pump
> power cord going into the pit. I also have access to the pipe containing
> the water being pumped out of the pit. I guess I could get a flow meter
> but that sound expensive.
*****************
It does not sound practical to tap into the pump wiring...it is usually all
sealed on a submersible pump. Consider a current sense transformer that
could be installed on an extension line cord. Digikey lists a unit on page
593 of their catalog, #237-1103-ND, $2.89 ea. With a 60 ohm terminating
resistor, it outputs 110 mv/amp, whch would double for a 120 ohm resistor,
(220 mv/amp with 120 ohm). The output could be rectified and conditioned
for Stamp use.
Ray McArthur
Ray, how do you suggest hooking up the Digikey current sensing device. I
would think you need break into either the hot or common circuit going to
the pump motor and insert the current sensor in series (pins 1A and 2A)
with one of these circuits? Thanks.
--- Ray McArthur <rjmca@u...> wrote:
>
Original Message
> From: Freddie Leaf <freddie_leaf@y...>
> To: <basicstamps@egroups.com>
> Sent: Sunday, October 22, 2000 2:38 PM
> Subject: Re: [noparse][[/noparse]basicstamps] Detecting if 110VAC device is on or off with
> BS2
>
>
> > The pump is triggered by a float. The pump and float are submerged
> down
> > in the sump-pump pit. The only thing I have access to is the 110VAC
> pump
> > power cord going into the pit. I also have access to the pipe
> containing
> > the water being pumped out of the pit. I guess I could get a flow
> meter
> > but that sound expensive.
>
> *****************
> It does not sound practical to tap into the pump wiring...it is usually
> all
> sealed on a submersible pump. Consider a current sense transformer that
> could be installed on an extension line cord. Digikey lists a unit on
> page
> 593 of their catalog, #237-1103-ND, $2.89 ea. With a 60 ohm terminating
> resistor, it outputs 110 mv/amp, whch would double for a 120 ohm
> resistor,
> (220 mv/amp with 120 ohm). The output could be rectified and
> conditioned
> for Stamp use.
>
> Ray McArthur
>
>
>
>
__________________________________________________
Do You Yahoo!?
Yahoo! Messenger - Talk while you surf! It's FREE.
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> in the sump-pump pit. The only thing I have access to is the 110VAC pump
> power cord going into the pit. I also have access to the pipe containing
> the water being pumped out of the pit. I guess I could get a flow meter
> but that sound expensive.
Maybe an audio piezo-film pickup or a strain gage mounted on the water pipe
could pick up vibrations from the pump, to be amplified and decoded by the
stamp.
-- Tracy
if at the discharge hose of the pump.
you push in 2 stainless needles side by side about 1/2'' apart and you
attach wires to the pins when the pump turns on and the water runs would
this be a switch????
and would it be enough to trigger an input on the stamp???
just a thought ..
victor
Original Message
From: "Peter May" <manager@s...>
To: <basicstamps@egroups.com>
Sent: Sunday, October 22, 2000 6:56 PM
Subject: RE: [noparse][[/noparse]basicstamps] Detecting if 110VAC device is on or off with BS2
> Well he is a change. Something I can add a thought on. You could wind a
coil
> yourself and place around one of the conductors only, Either the active or
> neutral (I am a sparky here in Oz and that's what we call them anyway).
> Depending on the number of turns and if a former is used etc will cause a
> voltage to appear at the coil ends. It's rough but if it serves to work
then
> perhaps a commercial version could be bought.
>
> Hope this helps....
>
>
Original Message
> From: Ray McArthur [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=GTtTmd1qylEo1yhLTVIfbVOg8RQsYNfAyzkUHTA2u6VJsuN8z54e_Z7A3bis-SFonIiOgsq-O3IFpw]rjmca@u...[/url
> Sent: Monday, 23 October 2000 7:00
> To: basicstamps@egroups.com
> Subject: Re: [noparse][[/noparse]basicstamps] Detecting if 110VAC device is on or off with
> BS2
>
>
>
Original Message
> From: Freddie Leaf <freddie_leaf@y...>
> To: <basicstamps@egroups.com>
> Sent: Sunday, October 22, 2000 2:38 PM
> Subject: Re: [noparse][[/noparse]basicstamps] Detecting if 110VAC device is on or off with
BS2
>
>
> > The pump is triggered by a float. The pump and float are submerged down
> > in the sump-pump pit. The only thing I have access to is the 110VAC
pump
> > power cord going into the pit. I also have access to the pipe
containing
> > the water being pumped out of the pit. I guess I could get a flow meter
> > but that sound expensive.
>
> *****************
> It does not sound practical to tap into the pump wiring...it is usually
all
> sealed on a submersible pump. Consider a current sense transformer that
> could be installed on an extension line cord. Digikey lists a unit on
page
> 593 of their catalog, #237-1103-ND, $2.89 ea. With a 60 ohm terminating
> resistor, it outputs 110 mv/amp, whch would double for a 120 ohm resistor,
> (220 mv/amp with 120 ohm). The output could be rectified and conditioned
> for Stamp use.
>
> Ray McArthur
>
>
>
>
>
>
>
>
>
>
this is the only method ive ever seen.
norm
>From: Beau Schwabe <bschwabe@a...>
>Reply-To: basicstamps@egroups.com
>To: basicstamps@egroups.com
>Subject: Re: [noparse][[/noparse]basicstamps] Detecting if 110VAC device is on or off with BS2
>Date: Sun, 22 Oct 2000 14:22:07 -0400
>
>At 02:14 PM 10/22/00 -0400, you wrote:
>
>What's triggering the pump in the first place? ...chances are it could
>already be a relay.
>
> >have the pump trigger a relay (solid state)
> >wich would give you an input on the stamp
> >or have the pump power up the stamp that way it would only be on when the
> >pump is on but you would have to be carefull with the rest of your
>circuit.
> >regards.
> >victor
> >
> >
> >
> >
Original Message
> >From: "Freddie Leaf" <freddie_leaf@y...>
> >To: <basicstamps@egroups.com>
> >Sent: Sunday, October 22, 2000 1:19 PM
> >Subject: [noparse][[/noparse]basicstamps] Detecting if 110VAC device is on or off with BS2
> >
> >
> > > I'm working on a stamp project that keeps track of when my sump-pump
>turns
> > > on and off. I'm using a Dallas Semiconductor Real Time Clock to keep
> > > track of time. The sump-pump runs on 110VAC and I'm not sure how to
> > > detect if it is on or off. I'm thinking that I could set up a current
> > > sensing device on one of the power lines going to the sump-pump. Any
> > > ideas on how to do this?
> > >
> > > __________________________________________________
> > > Do You Yahoo!?
> > > Yahoo! Messenger - Talk while you surf! It's FREE.
> > > http://im.yahoo.com/
> > >
> > >
> > >
>
>Beau Schwabe IC Mask Designer
>National Semiconductor Network Products Division
>500 Pinnacle Court, Suite 525 Mail Stop GA1 Norcross, GA 30071
>
>
>
>
>
>
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>
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Original Message
From: Freddie Leaf <freddie_leaf@y...>
To: <basicstamps@egroups.com>
Sent: Sunday, October 22, 2000 7:55 PM
Subject: Re: [noparse][[/noparse]basicstamps] Detecting if 110VAC device is on or off with BS2
> Ray, how do you suggest hooking up the Digikey current sensing device. I
> would think you need break into either the hot or common circuit going to
> the pump motor and insert the current sensor in series (pins 1A and 2A)
> with one of these circuits? Thanks.
Yes, you could do it on a short extension cord so as to not mess with the
pump cord, and insert the primary (1A and 2A) in series with one of the
legs. It is probably best to place it in the hot side to maintain
common-side integrity. The output winding is pins 5 and 8 where you connect
the resistor and detection circuitry.
You could connect a full wave bridge to the secondary, with the load
resistor on the bridge output to derive DC voltage for your detection
circuitry.
A current transformer is just a two-winding transformer with a small number
of turns on the sense, (input), winding and many turns on the output
winding. Being a "step-up" transformer, it steps up the primary voltage,
and steps down the primary current. It is normally loaded like "shorted"
transformer so as to minimally disturb the circuit it is in series with.
The Digikey unit is a 1/500 transformer. So if your pump draws 10 amps, 10
amps flows in the primary, and 10/500 or 20 ma flows in the secondary. With
a 60 ohm resistor across the secondary, the secondary voltage is 20 ma * 60
ohms=1.2 volts. The catalog spec is 110 mv/amp, or 1.1 volts for 10 amps
which is less than the ideal 1.2 volts because of transformer losses. You
can increase the load resistor for more output voltage, but losses increase
as you do this, and output falls more below the ideal.
Ray McArthur
The resistance between the needles would decrease with water flow, but would
be very unpredictable, depending on what contaminants are in the water at
the time. It also depends on sense voltage and current.
Ray McArthur
> here is a question ?
> if at the discharge hose of the pump.
> you push in 2 stainless needles side by side about 1/2'' apart and you
> attach wires to the pins when the pump turns on and the water runs would
> this be a switch????
> and would it be enough to trigger an input on the stamp???
> just a thought ..
Ben
Tracy Allen wrote:
> > The pump is triggered by a float. The pump and float are submerged down
> > in the sump-pump pit. The only thing I have access to is the 110VAC pump
> > power cord going into the pit. I also have access to the pipe containing
> > the water being pumped out of the pit. I guess I could get a flow meter
> > but that sound expensive.
>
> Maybe an audio piezo-film pickup or a strain gage mounted on the water pipe
> could pick up vibrations from the pump, to be amplified and decoded by the
> stamp.
>
> -- Tracy
far the simplest and safest method.
Original Message
From: Ray McArthur [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=3HGAkPAY_MQuS4sIOEzYENVFbqQFT55oCWwN8mIyscqTAN_YLH95cdobWYGW3y4YUTkQXUMuhiUk6g]rjmca@u...[/url
Sent: Sunday, October 22, 2000 4:00 PM
To: basicstamps@egroups.com
Subject: Re: [noparse][[/noparse]basicstamps] Detecting if 110VAC device is on or off with
BS2
Original Message
From: Freddie Leaf <freddie_leaf@y...>
To: <basicstamps@egroups.com>
Sent: Sunday, October 22, 2000 2:38 PM
Subject: Re: [noparse][[/noparse]basicstamps] Detecting if 110VAC device is on or off with BS2
> The pump is triggered by a float. The pump and float are submerged down
> in the sump-pump pit. The only thing I have access to is the 110VAC pump
> power cord going into the pit. I also have access to the pipe containing
> the water being pumped out of the pit. I guess I could get a flow meter
> but that sound expensive.
*****************
It does not sound practical to tap into the pump wiring...it is usually all
sealed on a submersible pump. Consider a current sense transformer that
could be installed on an extension line cord. Digikey lists a unit on page
593 of their catalog, #237-1103-ND, $2.89 ea. With a 60 ohm terminating
resistor, it outputs 110 mv/amp, whch would double for a 120 ohm resistor,
(220 mv/amp with 120 ohm). The output could be rectified and conditioned
for Stamp use.
Ray McArthur
perhaps a water container would fill and trigger a switch, put a small hole
in container so water could
drain once pump stopped!! or maybe a flapper at the end of the hose .
victor faria
Original Message
From: "Chris Loiacono" <chris01@t...>
To: <basicstamps@egroups.com>
Sent: Monday, October 23, 2000 10:23 AM
Subject: RE: [noparse][[/noparse]basicstamps] Detecting if 110VAC device is on or off with BS2
> I use current sensing as well with arrays of large resistive loads. It is
by
> far the simplest and safest method.
>
>
Original Message
> From: Ray McArthur [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=rksv_TwaDl4XHOcrM0ENU_UX6Z-XV7PttBv4vELF9coLyUMWNJhrNegSJ1WXYL5ItHdSh-pL9pznWQ]rjmca@u...[/url
> Sent: Sunday, October 22, 2000 4:00 PM
> To: basicstamps@egroups.com
> Subject: Re: [noparse][[/noparse]basicstamps] Detecting if 110VAC device is on or off with
> BS2
>
>
>
Original Message
> From: Freddie Leaf <freddie_leaf@y...>
> To: <basicstamps@egroups.com>
> Sent: Sunday, October 22, 2000 2:38 PM
> Subject: Re: [noparse][[/noparse]basicstamps] Detecting if 110VAC device is on or off with
BS2
>
>
> > The pump is triggered by a float. The pump and float are submerged down
> > in the sump-pump pit. The only thing I have access to is the 110VAC
pump
> > power cord going into the pit. I also have access to the pipe
containing
> > the water being pumped out of the pit. I guess I could get a flow meter
> > but that sound expensive.
>
> *****************
> It does not sound practical to tap into the pump wiring...it is usually
all
> sealed on a submersible pump. Consider a current sense transformer that
> could be installed on an extension line cord. Digikey lists a unit on
page
> 593 of their catalog, #237-1103-ND, $2.89 ea. With a 60 ohm terminating
> resistor, it outputs 110 mv/amp, whch would double for a 120 ohm resistor,
> (220 mv/amp with 120 ohm). The output could be rectified and conditioned
> for Stamp use.
>
> Ray McArthur
>
>
>
>
>
>
>
>