I searched far and wide but couldn't find an answer to my question. I've read the datasheet and I've look at schemes. I'm not very experienced with electronics.
Let's say I apply 5V to VCC from a given power supply, and then connect the ground. If I short IN1 and IN2 with VCC, nothing happens. Why is this so? Logic dictates it should, because when an Arduino controls the relay it powers the relay from 5V and then uses the same power supply to switch the relay with a pin connected to IN1 and IN2.
Why wouldn't it work with a simple 5V power supply? The power supply I used was my phone's adapter, it delivers exactly 5V.
Is there a way to short something to make it work?
The scheme's idea is to switch between 5V from the wall and 5V from a battery. If power from the wall is available, then the battery is disconnected and recharged, if power is out then the battery kicks in.
I know MOSFETs will probably be better in this case but I've already soldered the thing.