homemade ecig project

Discussion in 'The Projects Forum' started by esterlyh3130, Mar 1, 2014.

  1. esterlyh3130

    Thread Starter New Member

    Mar 1, 2014
    5
    0
    Hi, I have several ecigs, but i always find myself saying i can do better. I have been doing a lot of research. the two closest thing i have found is this
    http://puckecig.com/2011/12/added-variable-voltage-control-to-your-ecig-mod/
    http://www.vapeatron.com/how-build-easy-variable-volt-dual-18650-wood-mod-56023/
    Although sadly neither of these are quite what I'm going for. I am more of a carpenter than an electrician, so I'm sorry if I don't fully understand everything.
    The project i would like to make would consist of using two 18650 batteries. then i would have a Variable voltage that goes of up 9 volts down to 3(doesn't have to be exact), i would also like to have a display that tells what voltage I would have, then if i can an led when the button is being pushed.

    My biggest issue is that I'm worried that if i jump right into this I'm going to end up burning out the resistors, transistors, or whatever else i decide to use.

    My other worry is the DC to DC Converter Switching Regulator, is that what i would want or would i what something like the LM2577 boost? i saw here it can use 5v to make 12v. http://www.eleccircuit.com/lm2577-5v-to-12v-dc-converter-step-up-voltage-regulator/
    although, i wonder if i even need this? if i use two 18650 batteries that each have a charge of about 4.2v, that would give me 8.4v (i can live with that) and i could just use a transistor to control it? but would i need the switch regulator to make the voltage constant?

    Now my final worry, i do not want to but the voltage display or 510 Connector from that website provided in one of the tutorials. I would like to just pick it up at radio shack. if i have to order it well, Beggars cant be choosier. But i don't mind tearing apart a multimeter if that will work.

    I would really appreciate the help. thank you!!
     
  2. AfdhalAtiffTan

    Active Member

    Nov 20, 2010
    117
    11
    Would you mind just to use simple 555 pwm?
    The control is pretty much open loop, you'll need to adjust the output overtime as the battery drained slowly.

    As for the display, simplest ones that I could think of is LM3914 LED bar graph.

    I believe there's already commercial voltage display available: http://www.ebay.com/itm/Mini-DC-2-5-30V-Red-LED-Panel-Voltage-Meter-3-Digital-Display-Voltmeter-F8s-/371015477562?pt=LH_DefaultDomain_0&hash=item56623ee93a

    It's pretty hard to miniaturized the project down, unless if utilizing smd parts.
     
  3. esterlyh3130

    Thread Starter New Member

    Mar 1, 2014
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    0
    well, I just want to make this project right. I will throw an idea at you and if you think i should just lose hope, then i will go with your plan. what i am considering is that i get the LM2577S-12/NOPB-ND (http://www.digikey.com/product-detail/en/LM2577S-12/NOPB/LM2577S-12/NOPB-ND/363659) and use a resistor to bring it down a little from 12v because thats a lot. Once i get it down to 9v i could use the transistor you suggested or something similar to this (http://www.digikey.com/product-sear...ng=en&keywords=3352T-201LF-ND&x=0&y=0&cur=USD)
    From here i would have to order a 510 connector, a push switch of some kind, and the voltage display you showed me looks promising.
    i feel confident that i could wire that all together easily, as long as i buy a simple circuit board from radioshack. My only worry, is that the LM2577S-12, has an output 3A output. Now, i don't really understand how that would affect the project. any ideas??
     
    Last edited: Mar 2, 2014
  4. shortbus

    AAC Fanatic!

    Sep 30, 2009
    4,009
    1,530
    You going to make your own heaters too? Most E-cig heaters work on a lot less than 9V. more like ~4V.
     
  5. esterlyh3130

    Thread Starter New Member

    Mar 1, 2014
    5
    0
    the coils? yea, i currently make them. well, you may have a point, i used to make my dual coils at 1.9 ohms, and i would run on about 5v. although, now that i think about it the entire reason I'm making this is because my zmax mini has an ohm cut off... so maybe i could just make my max 6v and run a transistor down from there?
     
  6. burger2227

    Member

    Feb 3, 2014
    190
    24
    I don't see you burning up any transistors, in fact I don't see any. I see battery current as the thing to look out for. Lithiums are cranky!

    All you need is a voltage regulator to adjust to your pleasure. Where do you get the inhale switches?
     
  7. esterlyh3130

    Thread Starter New Member

    Mar 1, 2014
    5
    0
    inhale switch?
    what do you mean i should watch out for battery current? as in amps?
    i don't know anything about anything, so what do i want to look out for?

    i think i am going to follow most the diagram from http://www.vapeatron.com/how-build-easy-variable-volt-dual-18650-wood-mod-56023/ I may just make a few minor adjustments here and there. he does use a 200ohm trimmer pot wired from the switch regulator to the 510 connector , and currently I'm am trying to make a diagram to see if i want a different ohm pot.
     
  8. esterlyh3130

    Thread Starter New Member

    Mar 1, 2014
    5
    0
    okay, i have used part of a diagram from http://s27.postimg.org/h3rmltl37/dena5.jpg and also followed along from this http://www.vapeatron.com/how-build-easy-variable-volt-dual-18650-wood-mod-56023/ . the reason i took info from both is that i didn't want to use pin1 because it requires another piece.

    i am using a Voltage display, 510 connector, a push switch, a 3 setting switch (first position is option 1, second position is option 2, third position is option 3), then i am using the OKR-T6 to give me a constant 6v from my 2 purple samsung 18650 batteries, ***a 200Ω resistor***, and a 200Ω Trimmer pot.

    my only worry is that i have seen in on the http://s27.postimg.org/h3rmltl37/dena5.jpg diagram that they use a 220ohm resistor, and i am not quite sure why the other post used a 200 ohm resistor... if someone could please give me some guidance to what i should use, and what the effect of the different ohms, would be that would be great!

    i have made a rough schematic of what i would do.... it is very rough..... I'm no artist..... but if someone doesn't mind looking it over and seeing if there are any problems that'd be great too!!!
    thank you everyone for putting up with me
     
  9. shortbus

    AAC Fanatic!

    Sep 30, 2009
    4,009
    1,530
    This isn't a 'precision' type thing.:) 200Ω in a 10% resistor could be in actuality as high as 220Ω or as low as 180Ω. If you have a 200Ω use it, if you have a 220Ω use that. No difference for what your building.
     
  10. burger2227

    Member

    Feb 3, 2014
    190
    24
    The 200 ohm pot adjusts the voltage. The 220 ohm resistor establishes a minimum resistance on Pin 5. That chip limits current and temperatures so it looks pretty safe. I gather you charge the batteries elsewhere.

    The reason I asked about the inhale switch is that is how it works on an E-cigarette rather than having to push a button switch.
     
  11. kinixecig

    New Member

    Nov 28, 2014
    2
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    Hi, I read your first i understand but Now what you want to say i cant understand :(
     
  12. ISB123

    Well-Known Member

    May 21, 2014
    1,239
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    Doesnt matter what resistor you use as long as its between 150-250 Ohms.Resistors have tolerances 1%,5%,10%...
     
    Last edited: Dec 1, 2014
    shortbus likes this.
  13. kinixecig

    New Member

    Nov 28, 2014
    2
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    Yeah U r rite We use any resistor it doesn't matter
     
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