I'm looking for a physical command technology, which has minimal registration delay.
Objective: To make a live auction system with 20-40 people, where each one has a physical command, where the price has a starting point, for example (1.80€) and an interval after which the price drops (ex: 0.01€ every 200ms).
I've already found, Zigbee network with buttons. The problem is that there is no firmware that makes it possible to disable the double click, which makes the system slow (+-500ms), because the command when receiving a click is waiting for the second .
I've also tried to investigate infrared commands, as it also has little delay, but these systems tend to have a high energy consumption, unlike zigbee commands.
Thank you for your suggestions.