How can I turn a 4x4 keypad matrix into a fully functional TV remote

Using Arduino Project Guidance
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I am trying to make a TV remote with as much functionality as possible. I had the idea of using my 4x4 keypad matrix for this. How can send IR signals with the keypad?

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You need to learn each of these:

After you record your remote codes you can use the keypad to transmit those codes.
I would start with just 16, later you can add bells and whistles but start small.

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