Tuesday, October 9, 2012

Automatic Tea Timer

Getting cold outside drinking a hot cup of tea is one of my favourites. But all tea enthusiasts know when cooking a cup of tea timing is crucial. One or two minutes too long and your tea will become bitter. That's why I built this little automatic teabag lifting timer to do the work for me!
 If you want to know how to build your own, click here!
The timer consists of three simple but crucial components.
The laser slide mechanism of an old CD drive, a mechanical kitchen timer, which has a rotating part
 and a on/on type switch.
This is a standard, cheap, mechanical kitchen timer. I chose this one because it did not look as bad as this one:

Basically every timer with a moving part works. What we need is a switch that's triggered by our kitchen timer.
I used some metal parts, which get connected by the kitchen timer when it turns back to zero. 
You can see the metal pin hotlgued onto the outer moving ring of the timer. This pin will move to the left when the timer runs and it will activate our switch.

I installed all components on a piece of wood. The timer trigger closeup can be seen here:
Now we need some mechanism lifting the teabag out the teapot.
I thought it would be very handy using an old CD drive because all of you should have one lying around somewhere. Disassemble the CD drive and extract the part with two parralel rails and the laser head in the middle of it:
 
 
The plan is: the timer triggers the mechanical lever lifting the teabag, but we need something shutting of the lever when it has done its work - otherwise it would be on all the time draining the battery instantly.


So you'll ned a simple switch for that:

This switch will disconnect the power to the motor after pulling up the tea bag. If you press the switch down, it will disconnect the first and third pin. Now we need to install this switch on the CD drive mechanism.




How should it work?
The mechanical laser part goes down pushing up the other end of lever which pulls out the teabag. The stop switch disconnects the motor when the lever is up.


This is the moment when the laser part comes down and pushes the disconnect switch.
The next step is building the lever. I used a two screws and a piece of wood:

 One screw on the laser part and one screw on the side of the frame.


Drill a hole into the lever on its axis and a slot on the end that goes to the laser part.
Laserpart going down - teabag going up!
All that we need now is a pair of batteries:
The circuit works this way: Connect one end of the battery to the timer trigger. The other end of timer trigger goes to the motor. The motor's second cable goes to the stop switch. And the other battery cable goes to the stop switcht's last pin. Voilá!

Let's put all parts together:
Last but not least: a wooden baseplate and some acryl glass just for the looks.
Set the timer, pull down the lever, attach a teabag and kick back for a nice cup of tea!
For a video demonstration watch the video below:
Please share this simple tutorial with your tea loving friends!

9 comments:

  1. Very clever! I wonder if this could be done totally mechanically. Maybe use a counterweight, and have the timer trigger a pin on it similar to how a mousetrap works?

    ReplyDelete
  2. The "penguin tea timer" is purely mechanical, using the extra energy stored by the timer spring to lift the bag. http://www.popgadget.net/2007/10/perfectly_brewe.php

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  3. How do you lower this for the next cup of tea ?

    ReplyDelete
    Replies
    1. Wind up the timer, then simply pull down the lever again and attach the teabag!

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  4. what kind of cd drive did you used is it from pc or from a cd player

    ReplyDelete
  5. great idea, I've been trying to make a button pusher to turn a lever on a vintage camera motor that starts and stops the motor. Then I would in theory then have a interval-meter. You may know if you try to buy one that will work with an old clockwork camera they are usually over $500. They also contain a motor which I do not need as I already have a very good little motor that is made for the camera.

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