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TinyRemoteXL - 12-Button IR Remote Control based on ATtiny13A

TinyRemoteXL is a 12-button IR remote control based on an ATtiny13A powered by a CR2032 or LIR2032 coin cell battery.

The basic hardware is similar to the 5-button TinyRemote. The main difference is that the ATtiny13 has to query 12 buttons here. There are various options for using a larger number of buttons with just a few pins. However, most of them do not meet the following conditions:

there are only four pins available for twelve buttons,
a keystroke must trigger an asynchronous interrupt to wake the ATtiny from deep sleep mode,
the circuit must not consume any electricity as long as no button is pressed.”

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