Operatng a remote control remotely!

R

Rod@Hillhead

Guest
Hi,
I have a remote control that opens the garage doors when a button is
pressed. I wish to do this remotely so have shorted the appropriate
button and a voltage will be applied across the battery terminals when
I need the remote to operate. This works fine. I do though need a
way to cut off the applied voltage after say 2s as I need a short
pulse rather than continuous operation. Whilst I could buy an
adjustable timer, is there a simpler way?
Thanks.
 
Rod@Hillhead wrote:

I have a remote control that opens the garage doors when a button is
pressed. I wish to do this remotely so have shorted the appropriate
button and a voltage will be applied across the battery terminals when
I need the remote to operate. This works fine. I do though need a
way to cut off the applied voltage after say 2s as I need a short
pulse rather than continuous operation. Whilst I could buy an
adjustable timer, is there a simpler way?
Click to expand...
Do you mean to turn off the "voltage ...applied across the battery
terminals..."?

There's nothing simpler (for this function) than a bought time delay relay;
you just plug it in.

But, if you want to design and build something just for fun/education, go
for it! :)

Cheers!
Rich
 
On Tue, 19 Oct 2010 13:50:53 -0700 (PDT), "Rod@Hillhead"
<remcg@tesco.net> wrote:

Hi,
I have a remote control that opens the garage doors when a button is
pressed. I wish to do this remotely so have shorted the appropriate
button and a voltage will be applied across the battery terminals when
I need the remote to operate. This works fine. I do though need a
way to cut off the applied voltage after say 2s as I need a short
pulse rather than continuous operation. Whilst I could buy an
adjustable timer, is there a simpler way?
Click to expand...
---
More than likely.

What voltage are you applying across the remote's battery terminals
and how are you doing it now?

---
JF
 
On Oct 19, 1:50 pm, "Rod@Hillhead" <re...@tesco.net> wrote:
Hi,
I have a remote control that opens the garage doors when a button is
pressed.  I wish to do this remotely so have shorted the appropriate
button and a voltage will be applied across the battery terminals when
I need the remote to operate.  This works fine.  I do though need a
way to cut off the applied voltage after say 2s as I need a short
pulse rather than continuous operation.
Click to expand...
You could connect the power through a capacitor, with a bleed
resistor.
The capacitor charges up and the voltage across the remote
goes to zero... and when power is removed, the bleed
resistor discharges the capacitor before the next cycle.
 
Rod@Hillhead wrote:
Hi,
I have a remote control that opens the garage doors when a button is
pressed. I wish to do this remotely so have shorted the appropriate
button and a voltage will be applied across the battery terminals when
I need the remote to operate. This works fine. I do though need a
way to cut off the applied voltage after say 2s as I need a short
pulse rather than continuous operation. Whilst I could buy an
adjustable timer, is there a simpler way?
Thanks.
Click to expand...

I'm wondering why you can't just use a momentary switch in series
with the battery for the remote. The duration of the pulse would
just be the length of time you pressed the button. But you may
have something in mind that is not apparent in your post. In that
case, read on.

Assuming a 9V battery for the remote:


+9 ---+-------+------o---
| | ^---o----- +9 to remote
| [R3]
| |
| +---[Relay]---+
o | |
| PB +-----|<------+
o D1 |
| /c
+-----+---[R1]---+---| Q1
| + | | \e
| [C1] [R2] |
| | | |
Gnd ---+-----+----------+----+---- Gnd to remote



C1 = 2200 uF
D1 = 1N4001
PB = pusbutton, momemtary, normally open
Q1 = TIP120
R1 = 2.2K
R2 = optional
R3 = 51 ohms
Relay = G5LE-1A DC5 5 volt relay

The above is a generic delay circuit which provides some delay time for
the drop out of the relay. The relay will energize when the pushbutton
is pressed, and will de-energize when you release the button after a
short delay. The length of the delay time depends upon the components
used. You can substitute for C1 to affect delay time: the larger the
value of C1, the longer the delay time. You can add R2 to make the delay
time shorter, and you can use large value potentiometer for R2 to make
the delay adjustable. The circuit does not provide precision timing,
but is fine for what you describe. In fact, my bet is you could use
a much shorter delay than the 2 seconds you mention. That could make
things even simpler than the circuit posted.

You can substitute a different relay for the relay in the parts list.
R3 was chosen for that specific relay to drop the +9V to about +5
volts. If you use a 9 volt relay, R3 can be omitted. If you use
a different 5 volt relay, you need to chose a value for R3 that
will drop the voltage to +5, based on the current that chosen relay
draws.

Ed
 
ehsjr wrote:
Rod@Hillhead wrote:

Hi,
I have a remote control that opens the garage doors when a button is
pressed. I wish to do this remotely so have shorted the appropriate
button and a voltage will be applied across the battery terminals when
I need the remote to operate. This works fine. I do though need a
way to cut off the applied voltage after say 2s as I need a short
pulse rather than continuous operation. Whilst I could buy an
adjustable timer, is there a simpler way?
Thanks.



I'm wondering why you can't just use a momentary switch in series
with the battery for the remote. The duration of the pulse would
just be the length of time you pressed the button. But you may
have something in mind that is not apparent in your post. In that
case, read on.

Assuming a 9V battery for the remote:


+9 ---+-------+------o---
| | ^---o----- +9 to remote
| [R3]
| |
| +---[Relay]---+
o | |
| PB +-----|<------+
o D1 |
| /c
+-----+---[R1]---+---| Q1
| + | | \e
| [C1] [R2] |
| | | |
Gnd ---+-----+----------+----+---- Gnd to remote



C1 = 2200 uF
D1 = 1N4001
PB = pusbutton, momemtary, normally open
Q1 = TIP120
R1 = 2.2K
R2 = optional
R3 = 51 ohms
Relay = G5LE-1A DC5 5 volt relay

The above is a generic delay circuit which provides some delay time for
the drop out of the relay. The relay will energize when the pushbutton
is pressed, and will de-energize when you release the button after a
short delay. The length of the delay time depends upon the components
used. You can substitute for C1 to affect delay time: the larger the
value of C1, the longer the delay time. You can add R2 to make the delay
time shorter, and you can use large value potentiometer for R2 to make
the delay adjustable. The circuit does not provide precision timing,
but is fine for what you describe. In fact, my bet is you could use
a much shorter delay than the 2 seconds you mention. That could make
things even simpler than the circuit posted.

You can substitute a different relay for the relay in the parts list.
R3 was chosen for that specific relay to drop the +9V to about +5
volts. If you use a 9 volt relay, R3 can be omitted. If you use
a different 5 volt relay, you need to chose a value for R3 that
will drop the voltage to +5, based on the current that chosen relay
draws.

Ed
Click to expand...
Arrggh! There's a connection from PB to gnd in the schematic that
should not be there. Here's how it was supposed to be:

+9 ---+-------+------o---
| | ^---o----- +9 to remote
| [R3]
| |
| +---[Relay]---+
o | |
| PB +-----|<------+
o D1 |
| /c
+-----+---[R1]---+---| Q1
+ | | \e
[C1] [R2] |
| | |
Gnd ---------+----------+----+---- Gnd to remote
 
ehsjr:

+9 ---+-------+------o---
| | ^---o----- +9 to remote
| [R3]
| |
| +---[Relay]---+
o | |
| PB +-----|<------+
o D1 |
| /c
+-----+---[R1]---+---| Q1
| + | | \e
| [C1] [R2] |
| | | |
Gnd ---+-----+----------+----+---- Gnd to remote
Click to expand...
Warning: SPAM!

http://sourceforge.net/projects/fidocadj/

Nothing to install, just a .jar file to download for free.
 
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