I am drafting a pub quiz project, where the Referee gives a signal and multiple players push their buttons. The first to push wins the right to give an answer.
I want all buttons (referee's + X players) to be wireless. Since the best quiz players can click a button within 10ms of the signal, it is very important that there is a very, very little variance in ping between different buttons. I cannot have players shouting "my button is laggy!" On the other hand, I don't want to use more expensive/complex tech than needed.
SO, what would be the optimal wireless tech to use? Please share your experience from similar projects (or just theoretical knowledge :) Here's what I researched so far (correct me if I'm wrong):
Bluetooth 4 LE (as in RFduino) Pros: 3-6ms latency (advertised), low energy Cons: cost, not more than 7 buttons to the device
Wi-fi Pros: 2ms latency (I justed pinged my wi-fi router), dozens of buttons if need be Cons: cost, power-hungry
RF data tranceiver Pros: dunno, cost seems to be a bit smaller Cons: multiple buttons at the same frequency will probably create a lot of noise
Simplest "Radio remote" Pros: zero lag since it's all electromechanical, no data Cons: multiple buttons at the same frequency won't work
So, did I miss anything? I appreciate any guidance.