@zboblamont I would be interested to see your final sketch if you don't mind posting it.

Well done @zboblamont great news to see you have had a win.

The Playing with fusion sketch uses the I2C library found here

some more info on the library here

@unfadingpyro Great to hear you got it all working. Always a good feeling when a project comes together

1.5.4 is a few versions back now so it will help if you post the code you are using, even if it is the standard version. That will give us a starting point to work from.
Also what controller are you using.

Yes i can see your wiring now and no you are not likely to get any sort of reading with that circuit. You have the 712 wired in parallel with the charge wire, it needs to be in series instead. The load needs to be connected to the same side that the charge wire is on. So a quick re-draw of your circuit would look like this.

Don't forget to add a fuse at the battery positive.

The original drawing from earlier in this thread would also be ok

Your only getting 0 sent for the relay so it certainly won't be changing status. Perhaps post the code you are using .

@unfadingpyro I can't see your wiring diagram.

@alexsh1 I ended up using the dust sensor type for both readings. In Domoticz it allows you to set the letters to be used after the number so was easy to just add km to the end.

The original post where using dust was discussed is here

@ago1980 It should work but as I said i have not tested it. You may still need to tweak it to suit your setup.

To add extra relays I usually just duplicate the code if it is only two relays but more than that you will probably want to use a loop and perhaps an array to assign the variables etc. You will also need to add some code to your void receive function to sort out which switch/relay the incoming message is for.

The RelayActuator sketch in the MySensors examples shows a way to add more than one relay.

You could also have a look at my AC power controller project for an idea of how to use a case statement in the receive function to filter the incoming messages.