2 way switching using hall effect sensor

[Darren In England]

if you use our relay controller and the switch terminal board, you should replace your old wall switch panel with self-reset wall switch panel, that like buttons. just click button for a signal to relay controller, the switch panel state will not locked for ON/OFF. so every time just click the panel for ON/OFF, not need tell relay controller now the state is ON or OFF, when click the button, relay controller will change the state, like ON->OFF, OFF->ON. You also not need to use relay controller's input for switch, that's for sensor use.

There are two way for control the relays to only stay closed for a specific length of time like ON->30s->OFF.
A. use phone app to create the "SCENE" mode, make 1 action for relay ON, delay 30 seconds, relay OFF. this need controller connect with cloud server by internet.
B. use KC868-COL logical controller, when set the IFTTT command , relay ON,delay 30s, relay OFF save to KC868-COL, it will automatic control relay controller locally without internet. Way A, if internet is broken, the function will be invalid.

Hi. Thanks for that. Changing all the switches in the house isnt practical, the existing switches (of which there are over 30!!) are all colour co-ordinated to match the sockets and other outlets in each room (and they cost a fortune!!).  Also I am not sure that the switches you recommmend will fit UK standard back boxes as they are different to everywhere else in the world.  Will the logic controller allow me to control the lights using the existing switches by just telling the unit if the light is on or off so it can change the relay state as needed, my understanding of the logic controller is there are inputs which detect voltage??  This would allow me to do away with the hall effect sensors and just connect directly into the logic controller.  How many smart controllers can you have connected together??  I think I will need 3 or 4 in different locations around the house, will 1 logic controller be able to control all the other controllers, or do I need 1 logic controller for each smart controller (as you do with the Alexa module)??

Thanks