My advice is to buy a RC-Switch compatible remote switch. They cost about 2 dollars/euros on Ebay.
Capture the code with such a cheap receiver and use the RC-Switch library, GitHub - sui77/rc-switch: Arduino lib to operate 433/315Mhz devices like power outlet sockets.
Most of the very cheap remote switches are compatible.
I kind of like this option, but i am curios, how do the rc buttons output the unique bursts that they do, to be captured by a reciever (in our case, by the RC-Switch library)? could i create the unique output per button on my own, to then capture with an arduino running the RC switch library?
Those cheap modules are pretty crappy in operation. See where sf says, "Note:
These modules are indiscriminate and will receive a fair amount of noise". At
least they say so.
I noted that, but thought that since i am essentially just monitoring button presses, i could get away without it being too robust.
there are some very small ones available. There's also at least one clone that has an onboard transceiver http://shop.ciseco.co.uk/rf-328-bare-arduino-atmega-328-compatible-micro-board-rfu-328/ so you can get tiny wireless-enabled Arduinos very cheaply.
I think i may end up going this route. it seems very feasible. I need the transmitter end to be as small as possible (it will be going in a sweat band, to be worn while playing racquetball), but the receiver/display end will be larger. I will probably be displaying a score (count button presses) with small nixie tubes. I have a bunch sitting around, and this seems like a cool use.
Also, what transmission range are you looking for? Typically, low power devices, eg
0 dbm [1 mW], are only good for up to about 10m.
It is possible that you saw a post i made earlier, about using a theremin-type input to control a racquetball scorecard. This is for the same thing, so if someone were standing at the very front of the court, they would be about 12m away from the receiver, and only a single pane of glass between them. most likely, the transmitter will be about 6m away from the receiver when changing the score. I really liked the idea of the theremin style control, but in terms of keeping a game moving, it wasn't the best.