I'm working on a small project that consists of Attiny85 and one 3mm white LED, the power source is two AA batteries. The controller switch on/off the LED based on some conditions (data from analog input). After two month of nonstop running the batteries voltage felt to 2.5v. The controller still works, but LED light is barely visible.
I want to make it always bright till the battery completely die. I thought about 1.2v LED and voltage regulator LD1117S12TR.
But so far I found only 5mm 1.2 white led (OSM5DK5111A). All others are infrared. White are always 2.6-3.3 V.
Maybe you can suggest any solution to achieve such result?
It would be ideal if there will also be a possibility to control LED brightness from the controller.