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24 May 2010
Author: Giorgos Lazaridis
Instant Cold Coffee Machine




Worklog - The electronic part: The straw separator controller (September 25 2010)

The modules are almost ready, yet each one needs of its own controller to operate. So, i started with the most complicated (and most fancy) one, the straw separator. Here is the circuit of the controller:





And then, i start making the PCB...


My Zerox laser printer has always perfect results in artwork printing! A cut a piece of the photosensitive PCB board Artwork transfer with my UV Artwork Transfer Box and etching with my Etching Bath! So far so good!




And then i began soldering the parts on the PCB:


First the holes. I have this pen-style drill controlled with my homemade foot pedal! Then, using my homemade soldering station, i soldered all the parts. The flux paste has to be totally removed from both sides of the PCB, for both aesthetic and operational reasons! The PCB is ready for test. I still have to put the ICs on the base.


I did some measurements with the voltmeter to verify that all chips are powered correctly. Then i began inserting the chips 1 by 1, beginning with the 555. I verified that the 555 produces the correct pulses. Then i inserted the op-amp chip, and verified that both IR break sensors operate normally. Finally, i altered the PIC firmware and i uploaded to the PIC. When i inserted the PIC, the PCB did not work correctly. I discovered two problems. First of all, one of the 2N2222 was not working. I immediately replaced it. And then, i discover an error wiring that i had done to the PCB. That gave me a slight disappointment, but i fixed the problem and the PCB worked fine!


I measured many positions on the PCB to verify that it works I had to change a wrong route that i had make. I tested the PCB and the straw dispenser several hours, and proved to be quite reliable in operation.




The PIC Firmware

Here is the latest PIC firmware for the straw dispenser module. First the assembly listing do modify and re-compile:


 Coffee maker - Straw Dispenser - Assembly listing - V1.0

And the HEX file to upload directly on a PIC

 Coffee maker - Straw Dispenser - HEX file - V1.0





















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  • At 3 July 2015, 6:23:11 user Alex wrote:   [reply @ Alex]
      • Still watching this space every other month only to find the project still not being updated. Hoping to see some progress soon. :)

  • At 28 March 2014, 3:28:25 user Nikos wrote:   [reply @ Nikos]
      • re si, nomizo the "redux" version should have an optional milk stage too for those of us who prefer it a bit easier to drink :)

      subscribed on YT, keep up the good work!

  • At 18 January 2014, 7:31:43 user Giorgos Lazaridis wrote:   [reply @ Giorgos Lazaridis]
      • @Alex In Greece during the Ancient times there was this saying: "Oyden monimoteron ek toy prosorinoy" which means that "nothing is more permanent than the temporary".
      But now that you said that again, i think i should restart this project, shouldn't I? Hopefully within this year.

  • At 17 January 2014, 19:59:52 user Alex wrote:   [reply @ Alex]
      • Dude what happened with this project, there hasn't been any updates for quite some time now. Looking forward to see the end result :)

  • At 13 November 2013, 17:56:48 user Robert wrote:   [reply @ Robert]
      • This is a great invention! I especially like the straw delivery, it is perfect. how wonderfully useless! you are a genious!

  • At 16 September 2013, 15:38:37 user praveen wrote:   [reply @ praveen]
      • excellent job......

  • At 14 June 2013, 17:45:35 user Amir wrote:   [reply @ Amir]
      • Hi ,

      Great work . From where did you buy the worm gear extruder ? Can you give me a website for that .

      Many thanks
      Amir

  • At 29 March 2012, 21:03:02 user alex wrote:   [reply @ alex]
      • Hi you have a nice coffee Instant Cold Coffee Machine but you wanted to use a fridge for cold water but no water cooler that you use waron also in coffee automaaten is where you can get I know old water out of if not the name but it can look for you we have that built-in devices greetings alex
      mail alex.heijkens@kpnmail.nl

  • At 6 March 2012, 10:25:13 user Giorgos Lazaridis wrote:   [reply @ Giorgos Lazaridis]
      • @steve salvaged from an old photo copier. it was used to push the toner

  • At 5 March 2012, 13:56:29 user steve wrote:   [reply @ steve]
      • Where did you found the worm gear for the sugar and coffee supply?And awesome project.Good Job

  • At 9 January 2012, 9:40:16 user qwerty wrote:   [reply @ qwerty]
      • Tromeri i frapediera sou.bravo sou

  • At 24 August 2011, 11:38:08 user a.mira@vmcogulf.com wrote:   [reply @ a.mira@vmcogulf.com]
      • niccccccce i like this machine :) did you manufacuter it ???

  • At 26 July 2011, 17:53:16 user Sergio wrote:   [reply @ Sergio]
      • Excelent Job! Very good videos an explanations.

      Congratulations!


      Segio from Argentina

  • At 24 May 2011, 15:00:24 user Kammenos wrote:   [reply @ Kammenos]
      • @Fung no of course not. i will have different programs for different sizes. there are 4 sizes of cups (in respect to the volume)

  • At 24 May 2011, 14:24:55 user Fung wrote:   [reply @ Fung]
      • Do the cups which being used are restricted to the same size and same volume? (ie other cups are not allowed?)

  • At 14 May 2011, 19:27:58 user Ivan wrote:   [reply @ Ivan]
      • Great work.....

  • At 27 April 2011, 4:54:19 user Kammenos wrote:   [reply @ Kammenos]
      • @Dimitris it was part of an old photo copier, used to push the toner.

  • At 26 April 2011, 20:23:01 user Dimitris wrote:   [reply @ Dimitris]
      • Congratulations man!
      Awesome machine!
      Can you tell me, where did you find the 'worm' thing
      for the dispenser mechanisms?

  • At 27 March 2011, 6:16:30 user Kammenos wrote:   [reply @ Kammenos]
      • Hello George. Regarding the elements, these are hardware wiring to indicate wire connections between the modules. The orange boxes indicate wires coming from the output module (Digital Output Module - DOM), and the green indicate wires going to the Digital Input Modules. Notice that for example, from module "Rotary table", 4 wires comes out, then 2 of them arrive from the DOM and 2 goes to the CPU.
      As far as the diode is concerned, this is only for polarity protection. It is the same as the D2. But you are right, It is not necessary and i may not put it after all.

  • At 27 March 2011, 5:57:10 user George Hadley wrote:   [reply @ George Hadley]
      • I think your architecture diagram (first figure) is slightly confusing, because it seems to include elements of code (the elements above the CPU) with hardware elements. Ideally, you would have a system-level block diagram detailing your hardware and a separate functional block diagram to describe your code. If I'm misreading your architecture diagram, feel free to ignore this.

      Secondly, looking at your reset circuitry, I see you have a 1N4148 diode between your microcontroller pin and your ICSP header (pin 1). I'm fairly certain this diode is not necessary, so you may want to double check that.

      --George

  • At 25 March 2011, 11:45:30 user Fung wrote:   [reply @ Fung]
      • Why does PIC16F1937 have 2 Vdd's and 2 Vss's?

  • At 12 March 2011, 16:40:13 user de.das.dude wrote:   [reply @ de.das.dude]
      • you are sooooo awesome!!!

      there are no words to describe your awesomeness!

      i hope i can be as awesome as you!

  • At 25 May 2010, 1:53:39 user Tom Hargrave wrote:   [reply @ Tom Hargrave]
      • Frappé has become very popular here in the States. The difference is we use fresh coffee grounds to make coffee then we chill the hot coffee. But we tend to make more fresh coffee here while Europeans tend to make more instant coffee.

      To serve we pour some in a glass and add chipped ice.

      We also tend to add flavors to our frappé in the States. We can't leave a good thing alone - we have to tinker with it to make it more sellable.



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