I have an atiny with an RF emitter which would detect the 220V AC off in the circuit and send a radio signal.
to do this I use 2 super capacitor (1.5F 2.7v each ) to send the signal before dying. I've done some tests and putting the two super capacitor in series in my 5V power supply and it is working. But It seems that super capacitor have special design with charging and discharging.
can I use them like this or it is more complicated?