DNA modders' board project

[mamu]

I pre-wired and breadboarded the dna board and I'm happy to report it was really easy peasy and took less than a half hour to get er done! And of course I vaped with it for a while just like that. LOL!

So far it's working like a champ and gives a mighty fine vape. I'm waiting for parts, a watts meter, and a few cases to try out. So will update this thread when I've done a few complete mods with the dna board.

I have a mod planned to piggyback 2 dna boards to broaden the wattage range to 24 Watts of awesome powah!

I also have a mod planned to use a pre-selected wattage level via a 5-position slide switch for the 5 different wattage levels of 8, 9, 10, 11, and 12.

 

[Malduk]

Very nice, keep us posted.
With 2 boards, do you plan on implementing a separate switch to turn one on/off, so you can vape at lower settings too?

 

[mamu]

Very nice, keep us posted.
With 2 boards, do you plan on implementing a separate switch to turn one on/off, so you can vape at lower settings too?

I was thinking of the separate switch too. But the min with 2 boards running parallel is 10 Watts, with a full range of 10 - 24 Watts. I currently vape between 11-14 Watts with my vv mods. So for me, a separate switch wouldn't be necessary.

I haven't had a chance yet to put the board through all its paces as I'm waiting for some parts, so am looking forward to tinkering some more with it.

 

[breaktru]

Nice mamu, I see you have one too.
Fun ain't it.
Got mine together also. Just fine tuning the C code for the microcontroller & an OLED display.
Which pot value did you go with? The spec's say 1k to 10k will do it.

 

[mamu]

Nice mamu, I see you have one too.
Fun ain't it.
Got mine together also. Just fine tuning the C code for the microcontroller & an OLED display.
Which pot value did you go with? The spec's say 1k to 10k will do it.

Ya - it is fun. It's also interesting for me to wrap my head around vw instead of vv.

The only trimmers I have on hand is 200 ohm and 200K ohm. So for now there's a 200K ohm trimmer that I'm using dialed down and am testing with the range of 0 - 10K.

Haven't decided yet which one to go with, so I ended up ordering 1K, 5K, and 10K so will given them a go when I get them.

 

[urquidezj]

Tuned in. Breakthru and mamu are electronic ecig god/ goddes. I have mine in the way but have no idea what to do with it. I want a screen like Darwin but have no clue what to do on that. Aluminum box already drawn up, just need measurements and find addisplay for it.

 

[BJ43]

On a video on the English TV site the owner of evolv said they have an internal switch that when you have them piggy backed it turns one off automatically if you are using less than 12 watts.

 

[Para]

I pre-wired and breadboarded the DNA board and I'm happy to report it was really easy peasy and took less than a half hour to get er done! And of course I vaped with it for a while just like that. LOL!

So far it's working like a champ and gives a mighty fine vape. I'm waiting for parts, a watts meter, and a few cases to try out. So will update this thread when I've done a few complete mods with the DNA board.

I have a mod planned to piggyback 2 DNA boards to broaden the wattage range to 24 Watts of awesome powah!

I also have a mod planned to use a pre-selected wattage level via a 5-position slide switch for the 5 different wattage levels of 8, 9, 10, 11, and 12.

I knew you and Breaktru would cook up something special.

Jeez.....that's like vaping a car battery.

 

[mamu]

I got the watts meter and some parts the other day and now have had a chance to put the DNA board through its paces.

I initially had a 200K ohm trimmer cuz that's all I had on hand when I got the board. When I tested that I was getting 11 Watts no matter where I dialed from 0 ohms to 10K ohm so I figured that the 3rd pin was a comparitive and the 200K ohm trimmer was def not suitable to get variable Watts. I tell ya though, vaping at 11 Watts with a 3 ohm Boge SCC was mighty fine.

Now that I have the appropriate recommended trimmer, I'm getting inconsistent results as the board doesn't seem to want to be consistent in that the Watts will change by as much as plus/minus 0.5 Watts each time you press the button and I can’t get above 10W max. I tried a 1K, 5K, and 10K trimmer with no change in results. I didn't expect there would be but wanted to make sure.

All tests were done with an 18650 IMR 1600mAh batt.

Here's the data I've collected so far:
1.5 ohm DCC: min = 5W, 1.58A, 3.09V ::: max = 9.7W, 2.23A, 4.4V

2.5 ohm DCC: min = 4.8W, 1.28A, 3.64V ::: max = 10.1W, 1.87A, 5.42V

Standard 3 ohm SCC: min = 4.8W, 1.21A, 4.03V ::: max = 10W, 1.85A, 5.45V

510 standard atty (2.4 ohm): min = 4.7W, 1.31A, 3.64V ::: max = 10.1W, 1.91A, 5.3V

As it is, no matter what carto/atty I use I can't get above 10W. I may be doing sumfin wrong. dunno.

I did go back and put the 200K ohm trimmer on and now it maxes at 10W where previously it was 11W. No trimmer on the board though consistently gives 8W.

Min:

Max:

 

[breaktru]

I'm getting inconsistent results as the board doesn't seem to want to be consistent in that the Watts will change by as much as plus/minus 0.5 Watts each time you press the button. I tried a 1K, 5K, and 10K trimmer with no change in results. I didn't expect there

It's not you mamu, the readings are all over the place. I have the same results. I thought it was the microcontroller being too sensitive.

Maybe this board needs input and output caps to stabilize it a bit.

 

[mamu]

It's not you mamu, the readings are all over the place. I have the same results. I thought it was the microcontroller being too sensitive.

Are you able to get above 10W max breaktru?

I'm using a freshly charged 18650 AW IMR 1600mAh batt. No matter which atty/carto, I can't get it above 10W.

 

[mamu]

I'm going to try 2 DNA boards piggybacked and see how that goes. But if the one 18650 AW IMR batt is not supplying enough current for one board, I may need to use 2 batts in parallel.

 

[breaktru]

I'm now using two 20c Li-Po's in parallel. This sucker does draw a lot from the batteries.
Haven't put the DNA through extensive testing yet. Trying to get it into an enclosure so I have it apart for now.

I can't see having to use 2 DNA's in parallel to make a mod being that they are 35 bucks apiece. If one can't do it then it's time to look for one that can for less $$$$. I could use two 04050c in parallel for less and get 24 watts. or... a 30watt 08100w or OKR-T10
Don't get me wrong, I got mine for free but 70 bucks plus the extras is a lot of bread.

 

[mamu]

We're on the same page with the expense breaktru. $70 to get up to 24 Watts is a heck of a lot considering the $9 OKR that will go the range with whatever atty/carto is being used.

My initial thoughts were it would be great to use only one batt for the boost circuit vs the two batts for the buck circuit. But the way it looks, I may need 2 batts anyway with the DNA.

Anyway, it's a new toy for me right now and it's fun to tinker.

 

[hificat101]

My initial thoughts were it would be great to use only one batt for the boost circuit vs the two batts for the buck circuit. But the way it looks, I may need 2 batts anyway with the DNA.

Anyway, it's a new toy for me right now and it's fun to tinker.

It isn't really a buck circuit if that bats are in parallel is it Mamu? The spec sheet shows a max input V of 4.3V. I'm interested to see what you get if you parallel 2x18650's on it. I wonder if the 10w limit your hitting isn't because the chip is wanting more current than a single AW IMR can provide? I'm a modding noob so that may be a stupid observation. If it's right, it's gonna make it tough to use two chips without a backpack for power ala Ghostbusters.

At any rate, once this whole stability issue gets straightened out, here's what I'm throwing mine into with a pair of high C Panasonic 18650's:

Cool tin

Hat tip on the tin to ECF user Digital-Dragon. FWIW, the tin is better than the mints.

 

[mamu]

It isn't really a buck circuit if that bats are in parallel is it Mamu?...

I was referring to the boost circuit (DNA) needing only 1 batt vs the buck circuit (OKR) needing 2 batts (in series of course). I was hoping to finally make a mod using a boost circuit which requires only 1 batt, rather than needing 2 batts as required for the OKR circuit.

Although I have made mods with the TI boost circuit, you can't really get much above 5v vaping with it. I currently vape 2.5 ohm DCC at 5.8v. So for my needs, I need a boost circuit - either regulated watts or regulated volts - that can handle that kind of load.

I tried 2, 18650 AW IMR 2000mAh batts in parallel with the DNA board, same results - I couldn't get above 10 Watts max.

 

[hificat101]

I tried 2, 18650 AW IMR 2000mAh batts in parallel with the DNA board, same results - I couldn't get above 10 Watts max.

Grrrr. I was hoping that was all it was. With someone as talented as you, and some of the other modders here, I'm sure we'll have an answer soon.

 

[breaktru]

Even w/ two 20c Li-pos in parallel I can't get above 10.58 watts. Initially I get 9.68 watts and jumps to several values in between the min and max.
With one 20c battery I get slightly lower max wattage of 10.02 watts.
Readings were no different using a 2.4 ohm and a 1.02 ohm load.

update:
As per datasheet 3.3 ohms should get you 12 watts but I tried a 3.3 ohm atty and only get 9.7 watts.
I also notice that it is a pulsed output. I can hear the atty pulsing on and off. That's why the readings fluctuate.

Update2:
This is weird: Wanted to see if I see a red err LED on the DNA so I tried the 3.3 ohm atty again and got NO pulsing and get 10.38 watts. Still fluctuating readings. NO red LED indicating.

I understand that VW maintains wattage with the load. Resistance of atty may vary and the DNA adjusts accordingly to maintain the set wattage. But........ Wattage readings should NOT fluctuate.
Also most of my testing is with a fixed load. A Ceramic 20 watt resistor. No resistance variation should occur.

 

[retird]

are ya getting a Red LED error indicator light....

also, kinda shooting in the dark here since I am waiting for my DNA's, but is the watt meter in-line with the atty? Thinking ... measure the voltage at the atty with the watt meter in-line, then measure the voltage at the atty with the watt meter out of the line....

or, check the voltage-in at the meter and the voltage-out at the meter...

Ohm's law (we all use it): 6 volts at 3.0 ohms = 12 watts : 6 volts at 3.3 ohms = 10.9 watts

also, we know that too small guaged wire will cause voltage/wattage loss....going to build my DNA with 20 guage...

 

[retird]

oops, posted in wrong thread.....sorry......moved to

http://www.e-cigarette-forum.com/fo...bout-new-dna-modders-board-6.html#post6136216