The Dipper - a tea brewing robot

Tea brewer with deadly punctuality

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If you ever tried to make yourself green tea at 6am (or anytime for that matter) you know the struggle of setting up timer for 3 minutes, leaving it brewing for 20minutes and making another one because the first one would probably instantly put you to sleep.
So I decided sometime ago to fix this problem. I humbly present to you, the Tea Dipper or Brewer. I'm still contemplating the name.
As far as I can tell, this is the first of it's kind. Also, design lacks a designer, which I'm definetly not, but I did try my best.

- Integrated Li-Ion battery with charging port
- Knob that sets time in steps of 30 seconds from 1 to 9 minutes
- Buzzer
- Did I mention deadly punctuality?
- Deadly punctuality

3D files:

Since this is a project that will be sold in a near future, I need to consider 4 things:

1) Design

As I said, I'm not that good at design. But I do try and listen to good ideas. So if you have any suggestion, leave it in the comments! 

2) Electronics, PCBs, code

Electronic components are already picked and they seem to work pretty well. The only thing left to test is the battery. I need to know how long it lastst, how long it charges and how to make the whole experience user friendly.

PCB will be reworked. I ordered 10 PCBs for the first prototype which had two motors, so I'm using that one. However since it's quite big, the next step will be to replace it with something smaller. Also Arduino will PROBABLY be replaced with MSP430 from Texas Instruments (cheaper). But that's in the long run. For now it works fine.

3) Hardware design. 3D print.

I'm pretty good at 3D modelling, and since this was already accomplished (except for minor adaptations and corrections) I won't talk about it too much.

4) User experience

It NEEDS to be simple to use. There will be two "systems". One is for brewing tea. So user sets the time on the knob, and presses the button. From then on, the "Dipper" will rise, wait for the user to latch the tea bag to it's arm and press the button. Dipper wiill then dip the bag every 30 seconds untill the choosen time has passed. 

Second system is for the battery. I will need to figure out the best way to let the user know if the battery is empty so that the battery won't stop working right in the middle of the cycle. 


Current Arduino Code

ino - 12.40 kB - 07/30/2019 at 17:20


Gerber files for the custom PCB (mind you, this one was meant for two motors, but I'm only using one in this version)

x-zip-compressed - 63.19 kB - 04/09/2019 at 11:19


  • 1 × Toggle switch
  • 1 × 35BYJ46 Stepper Motor
  • 1 × ULN2003 chip / Stepper motor driver
  • 1 × RGB LED
  • 1 × Arduino Nano with custom PCB

View all 9 components

View all 2 project logs

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qgeraldo.manoelgp wrote 08/10/2021 at 05:47 point

What a great creativity... Really its looking very useful and amazing product you are working on a deep planning I also started a new hair straighteners project you can see here.

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ezar wrote 10/21/2019 at 18:34 point

Somebody have detailed component list?

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Charles Galambos wrote 10/12/2019 at 10:56 point

Hi! What a great project!  I'd love to build one of these, can you post links to the actual parts you used?   The battery, charging board etc.   It would also be great to know what the values of the components on the board are. Even uploading some photos of the parts and the schematic would help!

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ezar wrote 10/12/2019 at 14:32 point

Same here!

The list of parts is reduced and not clear.
I have printed the 3D and the board, but I would need the more detailed list of components.

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stefan.schnitzer wrote 10/07/2019 at 05:53 point


Great design! I also want to build one. Can you share the stl files please?


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ezar wrote 10/06/2019 at 09:01 point


I want to build one. Can you share all components please?


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Louis Irwin wrote 04/14/2019 at 19:45 point

Maybe they need to extend the Hyper Text Coffee Pot Protocol to include tea 😂

Great project though!

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