I'm looking into making my own remote control using an Arduino Mini Pro and some RF transceivers. The receiving end won't be a problem, but the remote will. I want to make it as small as possible and consume as little energy as possible.
Is it possible to turn on the Arduino Mini Pro at the push of a button, while also using that same button to trigger a piece of code? That way I can cut the power when it's not being pressed.
I will make sure to code it, so I have to hold the button down for 1-1.5 seconds, so it has time to "boot up" and send the RF signal, but should power off immediately when I let go of the button.
What kind of power should I expect from a single CR2032 battery? I have a couple of NRF24L01 RF transceivers laying around together with an Arduino Mini Pro.
If we assume this, while looking at this sheet:
NRF24L01: 10 mA per second (low-ball)
ATmega328P: 5 mA per second (low-ball)
CR2032: 0.19 mA @ 2V = 2100+ hours
Even if we just say 600 hours and it takes 2 seconds to turn something on, I should be able to run it
600H*60M*60S = 2.160.000 seconds = 1.080.000 times. If my calculation isn't completely wrong, it means I could literally turn it on a million times in the worst case scenario.
I hope that calculation is wrong, because that seems crazy.
EDIT: I could desolder the LED and regular as well, if that won't damage it too much. Just to consume power. I've read I can basically run it for free then.