Hello everyone, Im very new to electronics and I have a question..
Lets assume that I have arduino with lightbulb connected, And my goal is to toggle the bulb from afar using my phone, using wifi/bluetooth/radio.
My question is, how long can this arduino run on batteries? I mean, how does 'passive' listeners work? Do they take power?
For example, cars have a listener that knows when someone unlocks it with the remote key.. But how? The car is off, and the listener is always on..
If i want to copy the car unlock mechanics when the arduino is the car and my phone is the remote, does it have to always be on? If so, how long will it live on what batteries? Does it take power?