Is it possible to pull information from an iPhone or Android App to change the color of an LED on a Android (Uno) or ATtiny85 run device?
I am looking to make a "Toastmasters Timer" for speech contests. There is an Smartphone App that changes color for different timed speeches to let the presenter know when they reach their time limit.
I wanted to make a small device with a ATtiny85 (to reduce size) inside & some RGB LEDs that I can place on the table. I was thinking of using Bluetooth to communicate between the two devices.