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I know, I won’t really have a problem with programming, just a hardware stuff

Think I’m gonna stick with this 110W one. Could you recommend a way to measure ohms? Circuit/ic?

Oh, I thought they will have 4.2v under load. I think atmega, oled and stuff won’t take more than 2W. What you think about this one? Will it do the job? http://www.ti.com/lit/ds/slusci9a/slusci9a.pdf

Oh Thank you, everything is clear now. I’ve mistaken links, wanted to send this one https://www.digikey.com/product-detail/en/murata-power-solutions-inc/OKL2-T-20-W12N2-C/811-2961-1-ND/4738836 So I need to take converter efficiency and with that in mind calculate maximum wattage? Let’s say that...

Thank you for your replies. So buck converter is better than PWM? I have read that PWM is kinda dangerous because it doesn’t lower wattage but only deliver it for less time (eg. with fully charged cells and 0.2ohm resistance it would give 350W which would kill the battery - more than 40A current...

Minimum voltage would be 6V (3V for cell). Wattage is the least important thing right now. The maximum wattage will be calculated based on resistance and actual battery voltage by micro controller. I don’t know how to change voltage and measure resistance

Thank you for the links. Thanks to Battery Mods, Now I know that I don’t want PWM anymore, more risky and I can’t really control wattage. I think I’m gonna use DC step down. Can you recommend any with 200W output? Other links didn’t really help me, in the PWM mod he decided to take ready board...

I was googling and couldn’t find anything good and useful. I haven’t really used many cigs and I don’t know to which one I can compare it. Just a simple one with lcd and very basic variable wattage.

Thank you for info. I will decrease wattage then. Still didn’t get answer for questions stated in post. Anyone?

I saw Sony cells to have discharge rate of 30A. I can reach 200W using 0.35ohm and when fully charged - 8.4v. It takes 24A. Correct me if I’m wrong.

Hi, Budget shouldn’t be a problem, I hope 30€ for electronic components is fine (not including case). I’d like to do something on my own. I live in EU, Poland to be precise. I’m more like programmer rather then engineer and stuff, but I designed few circuits and pcbs (mainly keyboards).

Hi guys. I’m interested in making my very first e-cig based on atmega (probably Arduino). It would be used to monitor cells and regulate wattage/voltage. What do I know so far: - gonna use atmega328p - 0.96” 128x64 OLED I2C - 2xLi-Ion 18650 in series - of course 510 connector I want to reach...