I was assigned he task of designing a buzzer circuit for a challenge quiz type thing (I don't know what they're actually called). So I threw some stuff together for a prototype with an arduino uno and some tactile button switches and an led.
This worked out fine but then I got a suggestion to design an app for android that would replace the physical buttons. Designing the app itself is no prob, the problem is getting more than one bluetooth enabled phones to connect to one bluetooth module. I'm not sure if this is even possible because googling it doesn't help much. Any advice? Anyone here have much experience working with the rn-42 module? Thanks.