If everything has worked well, you now have a flickering "flame" atop your LED candle. Brag to your friends. The units I bought came 2 to a package,...
Take a dollar-store "flickering" LED candle, add an AVR ATtiny13 and a little code, and you get an LED candle that looks almost real.
Step 1: Open up the candle casing
A thumbnail seemed to be the best tool for this job. The casing isn't glued. There's just a friction-fit post that goes into a receiving hole in the cover. Work around the cover edge and the base part will begin to come loose. Don't get into a hurry because the wires connecting to the LED module inside are very fine and easy to break. We'll be re-using these wires, so be careful.