Hello all electronics wizards. I'm looking for a way to get a little more out of my madvapes voltage indicator. As some of you know, this device screws into your atty connection, and also has a battery connector up top for testing your battery 'under load' with an atomizer attached.
So, for example, when I screw the indicator on a device with a 3.7 volt 14500 battery that has been fully charged, I will get a reading of 3.7-4.2 volts, as expected. When I throw on a 1.5 ohm atty, I get my voltage under load to read 3.3.
My question is this. How can I turn that 3.3 number into something that is useful to me. Is it possible to use this voltage indicator to test the ohms of my atty's? If so, what formula do I need to use in order to calculate the resistance of the atty attached? I've been racking my brain on this all morning, and I can't quite seem to wrap my head around it.
Thanks in advance for the help!