Arduino: Where can I find the infrared codes to control a tv?

You can first decode them by using an Infrared Detector, and pointing your TV remote at it. IR Emitter-IR Decoder pairs are often sold together (e.g., at Sparkfun). Alternatively, you can rely on a lookup table of common codes. For both of the above, start with Ken Shirriff's fantastic IR remote library, assuming you are working with the Arduino platform: 1) http://www.righto.com/2009/08/multi-protocol-infrared-remote-library.html blog article 2) https://github.com/shirriff/Arduino-IRremote Github page

the best way is to record replicate the tv remote ir output . as the codes keep changing as per the tv brands .