100 led * 0.050 A = 5A
but I think 3.7V is not enough to run the atmega at 20Mhz (as embeded in the arduino).With 3.7v you could run the atmega at 8Mhz alone I think.
I use a maple mini which usually runs at 3.3v, but indeed, certainly the smaller arduinos will have no problem just running straight off 1 3.7V battery. And for the strips, as I think protonerd already documented in this topic, giving them less than 5V is ideal . At 5V their protection diodes dissipate tons of power, just driving them directly off a single battery works very well (only when the battery starts getting low you'll start losing some brightness, and color). besides, trying to do DC-DC conversion in a lightsaberhilt for the power those leds need, is also going to be a challenge >_<.
use a smaller 5V DC-DC only for the arduino and other circuitry, and use the 3.7V for the led stripes.
Nice but why don't you use an atmega in standalone?On my side i will use an atmega and a bluetooth who will stream command to the phone .Sensor test:https://youtu.be/iksalVd8uBU
OK but i'm driving sensor, bluetooth, and led with atmega and even if there is no background process it seems synchronized.But what you are doing is surely more done with the perfect art than me