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1$ Kitchen Timer

 
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Baker
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Joined: 08 Dec 2008
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PostPosted: Mon Dec 08, 2008 6:41 pm    Post subject: 1$ Kitchen Timer Reply with quote

Someone has already tried to hack a 1$ kitchen timer to add a relay ?

ill try...

BTW if someone looking for a 1$ challenge its a good idea.
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Alan
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Joined: 29 Jan 2006
Posts: 1399
Location: Winnipeg, MB

PostPosted: Wed Dec 10, 2008 1:01 am    Post subject: Re: 1$ Kitchen Timer Reply with quote

Baker wrote:
Someone has already tried to hack a 1$ kitchen timer to add a relay ?

ill try...

BTW if someone looking for a 1$ challenge its a good idea.


Sounds like a good idea, I haven't seen that device here. Do you have a link to it?
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Baker
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PostPosted: Wed Dec 10, 2008 8:24 pm    Post subject: Reply with quote

Here is the cheap kitchen timer buyed at dollorama* ( 1$ shop )



I supposed that we should rectified and filtered the audio signal output for drive an SCR. And this SCR will driving the relay. Maybe we will be forced to amplify the signal before rectified it.

(sorry for my english, my first langue is french)
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Alan
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PostPosted: Wed Dec 10, 2008 9:34 pm    Post subject: Reply with quote

I always find it amazing what can be found for a dollar in that store. Smile

You could put it in alarm mode and poke around the circuit to see if there is anything that just goes high (or low) when in alarm. Very often a generic mass produced chip is used in these types of devices that could have an LED output or something similar. Even if it isn't used you may be able to fine the pin and tie into it.

If there is no easy way to tie into the circuit then you are right that amplifying the buzzer output will probably be needed. A simple op-amp should do the trick.
http://en.wikipedia.org/wiki/Operational_amplifier
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Baker
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PostPosted: Wed Dec 10, 2008 10:06 pm    Post subject: Reply with quote

You mean like this ?

http://www.edn.com/archives/1996/031496/graph/06di1fg1.htm
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Alan
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Location: Winnipeg, MB

PostPosted: Thu Dec 11, 2008 12:30 pm    Post subject: Reply with quote

Baker wrote:
You mean like this ?

http://www.edn.com/archives/1996/031496/graph/06di1fg1.htm


Or even just half of that circuit, something like this
http://www.radio-electronics.com/info/circuits/opamp_variable_gain_amp/op_amp_variable_gain_amp.php

Instead of rectifying the signal you could just use a small capacitor.
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Baker
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PostPosted: Mon Dec 15, 2008 10:01 pm    Post subject: Reply with quote

It was really easy... Cool

Give me the time to build my little project and i ll be back with some pic and schematic. Very Happy
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Alan
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PostPosted: Mon Dec 15, 2008 11:00 pm    Post subject: Reply with quote

Cool! Funny thing is I was in a Dollarama on the weekend and saw the timer you are using. Smile I am looking forward for more details.
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Baker
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PostPosted: Tue Dec 16, 2008 1:27 am    Post subject: Reply with quote

Here's the Basic Plan...



Have Fun ! Very Happy
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Baker
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PostPosted: Wed Dec 17, 2008 6:07 pm    Post subject: Reply with quote

edit
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cez06
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Joined: 12 Jan 2009
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PostPosted: Mon Jan 12, 2009 9:30 pm    Post subject: Reply with quote

Hmmm, very interesting.. It would be very useful to me.
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reesr99
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PostPosted: Sun Jan 18, 2009 8:29 am    Post subject: Reply with quote

Could you add an LED to turn on/off with the count up timer function. So the timer would tell how long the LED was lit?
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