# AC adjustable timer, motion sensor timer

M

#### [email protected]

Jan 1, 1970
0
Heres the setup:

1. I have standard household current (110v, 15 amp, AC) entering into
a device.
2. A momentary pushbutton switch is pressed.
3. This feeds a current to a standard receptacle outlet, activating a
light.
4. The switch is released.
5. Power is cut off to the light.

Here is what I want to accomplish:

1. When the pushbutton switch is released, the current flow to
the receptacle continues for an adjustable amount of time (ex: 4
seconds to 10 minutes).

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

Motion sensors from any hardware store do this same thing. They have a
switch to select 4 seconds, 10 minutes, or 20 minute activation. They
are typically hooked up to a light socket or sold individually for a
little as $10. I have found "AC Relay timers" on industrial supply sites, but they cost upwards of$50 and are very large units
themselves. I don't need motion of proximity sensor capability since
the device it switch activated. I simply need to keep current flowing
for a length of time after the momentary switch is released.

I guess, as a last resort, I could buy a motion sensor, disassemble
it, and somehow bridge the motion sensor part. However, I'm hoping to
accomplish this with premade unit of some kind, and for under $10 (since ill be making large quantities.) So, does anyone have any ideas of suggestions? Thanks -Matt R #### Randy Day Jan 1, 1970 0 Heres the setup: 1. I have standard household current (110v, 15 amp, AC) entering into a device. 2. A momentary pushbutton switch is pressed. 3. This feeds a current to a standard receptacle outlet, activating a light. 4. The switch is released. 5. Power is cut off to the light. Here is what I want to accomplish: 1. When the pushbutton switch is released, the current flow to the receptacle continues for an adjustable amount of time (ex: 4 seconds to 10 minutes). Your description is almost identical to one I asked about a month or two ago, except I wanted power off for that amount of time. Here's a circuit that was posted here in response. It should work just as well in your case - just use the appropriate relay contacts: +12v \ |------------------------ _ o o | )| | )| relay | _)| | | d | 1K ||-+ N-channel |_T_ ___ g ||<- mosfet +o o-+-|___|-+----+---||-+ s | | | | | | | | |+ .-. | | 1000=== | |<--+ | uf /-\ | | 2M pot | | '-' | | | | Gnd--+-------+-----------+ (created by AACircuit v1.28 beta 10/06/04 www.tech-chat.de) M #### Matt M. Jan 1, 1970 0 Your description is almost identical to one I asked about a month or two ago, except I wanted power off for that amount of time. Here's a circuit that was posted here in response. It should work just as well in your case - just use the appropriate relay contacts: +12v \ |------------------------ _ o o | )| | )| relay | _)| | | d | 1K ||-+ N-channel |_T_ ___ g ||<- mosfet +o o-+-|___|-+----+---||-+ s | | | | | | | | |+ .-. | | 1000=== | |<--+ | uf /-\ | | 2M pot | | '-' | | | | Gnd--+-------+-----------+ (created by AACircuit v1.28 beta 10/06/04www.tech-chat.de) Randy, Thanks for the info. I have never worked with making circuit boards before, so I have very little to no experience in this area. The schematic you posted looks simple enough for a beginners project, and I would assume that few parts = few dollars spent. If you have successfully made one of these, do you have any photos? If this requires 12v power, do I need a wall transformer, or can I incorporate one into the board? It still might be a little too tough to make these in quantities though, so any ideas where I can buy a board like this pre made? -Matt S #### Stanislaw Flatto Jan 1, 1970 0 Heres the setup: 1. I have standard household current (110v, 15 amp, AC) entering into a device. 2. A momentary pushbutton switch is pressed. 3. This feeds a current to a standard receptacle outlet, activating a light. 4. The switch is released. 5. Power is cut off to the light. Here is what I want to accomplish: 1. When the pushbutton switch is released, the current flow to the receptacle continues for an adjustable amount of time (ex: 4 seconds to 10 minutes). This describes working on home power distribution lines. If your part of the world lives in homes which include stairs, for sure you have used push buttons that activate the lighting of those caverns and darken them after some time. What I have seen were thermal units switching the power on and releasing after some adjustable time when the heater arrived at release point. Used in large numbers usually in cities. Ask any electrician. Thanks -Matt HTH Stanislaw. D #### Dan H Jan 1, 1970 0 Heres the setup: 1. I have standard household current (110v, 15 amp, AC) entering into a device. 2. A momentary pushbutton switch is pressed. 3. This feeds a current to a standard receptacle outlet, activating a light. 4. The switch is released. 5. Power is cut off to the light. Here is what I want to accomplish: 1. When the pushbutton switch is released, the current flow to the receptacle continues for an adjustable amount of time (ex: 4 seconds to 10 minutes). ------------------------- Motion sensors from any hardware store do this same thing. They have a switch to select 4 seconds, 10 minutes, or 20 minute activation. They are typically hooked up to a light socket or sold individually for a little as$10. I have found "AC Relay timers" on industrial supply
sites, but they cost upwards of $50 and are very large units themselves. I don't need motion of proximity sensor capability since the device it switch activated. I simply need to keep current flowing for a length of time after the momentary switch is released. I guess, as a last resort, I could buy a motion sensor, disassemble it, and somehow bridge the motion sensor part. However, I'm hoping to accomplish this with premade unit of some kind, and for under$10
(since ill be making large quantities.)

So, does anyone have any ideas of suggestions?

Thanks
-Matt

In order to determine the best solution you need to specify what the
load is going to be i.e. what is going to be controlled by the device?

When you say "large quantities" how large?

If you are going to sell these to be plugged in house current, there
may be safety issues or regulatory issues - you should have a
professional look at what you are doing or design something for you.

Dan

M

#### Matt M.

Jan 1, 1970
0
In order to determine the best solution you need to specify what the
load is going to be i.e. what is going to be controlled by the device?

When you say "large quantities" how large?

If you are going to sell these to be plugged in house current, there
may be safety issues or regulatory issues - you should have a
professional look at what you are doing or design something for you.

Dan

Dan,

The switch device would be controlling a 100w floodlight. I believe
that is about 1 amp. A switch might have 1 or 2 lights connected to
it, and the devices would be daisy chained, with the total amperage of
all the bulbs being less then 13amps, or about 13 lights.

-Matt

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