For my first Arduino project, I'm trying to make a buzzer system like the ones used at quiz bowls. I'd like to have at least 3 wireless controllers, and when one of them buzzes in, the appropriate LED on the receiver lights up and the other buzzers are locked out until the system is reset. I don't have a lot of electronics expertise, so I'd like to get some advice on how this could work.
First, is an IR led/receiver a good option for this? The buzzers are for classroom use at a range of up to 5-10 yards, so if anyone has any specific hardware recommendations, I'd love to hear them.
How do I get the receiver to differentiate between the controllers? My first thought was to blink the LED at different use different frequencies, but I don't know how to go about detecting this. Is this a reasonable approach?
I'll have plenty more questions on the details later, but first I'd like to ask if the idea itself is sound. Any advice appreciated!