Make your own TV remote!
Project showcase by stegabetti
Thanks for the suggestions, frenchy22.
I could actually go for a 4x4 button matrix in the future, so to increase the available functions.
As it concerns battery saving, I'm not very familiar with transistors, but your solution looks like a clever trick.
Since I'm using an Arduino Uno, what I will do in the future will be to use the Arduino as a programmer and then extract the ATmega microcontroller and put all the design on a prototyping board. If I can make a decent voltage regulator circuit, I will be able to save more power than with the current configuration.
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