Record and playback simple radio [control] signals

Hi. I guess the first thing to do would be to have a look inside the remote control and see what's in there. It's likely that there's a radio module inside, and you can look at the model number and work out what frequency it transmits on. You could then buy something else that transmits on the same frequency.

Then, I guess you have to figure out what signal it sends. It's probably better to look inside the module itself, as if where you live is anything like here then there are signals floating around all over the place and you'll never figure out which one is the one for the blinds!

You could use a logic analyser (you can buy USB ones quite cheap) but you may be able to connect Espruino up to the remote control (once you know what the radio module is and what pin is the data input pin) and write some code that outputs what the signal is.

After that it should be pretty easy to duplicate those signals and to see what happens!