![](https://lemmy.world/pictrs/image/9871f61c-9f1c-4f09-9c50-3eab9b1c91cb.jpeg)
![](https://lemmy.world/pictrs/image/27811e0f-7996-4187-9484-c6d62dd9d85f.jpeg)
if you have an emisar light and can disassemble it, then you can try soldering an airwire from the sense resistor to the button LED pad (sacrificing it for that), if that cause problems with the current regulation, add a 10k resistor or the likes.
with a linear driver Iout=Iin so it’s simple, with a boost driver Iin=(Vout x Iout)/(Vin x efficiency) so there is more calculations and some guestimations.
C’est beaucoup mieux que les autres apps que j’ai testé et surtout elle est adaptée aux tablettes, par contre les prix sont un peu élevés.