Thank you Sundberg84, Actually I was not planning in using any controller but upgrading the already available hardware and firm if necessary. The fastest opton would be replicating a 2 way unit in the ones I got but that would reduce the fun. This would be the only option if functionality is based in the firmware

Hi!! Good to see so many people with common interests!

I've seen there's another thread about touch switches but did not find info about what I want to work out.

I have two 1 gang & 1 way touch switches that look like LIVOLO's but the brand is not printed in the glass. I did realized that the PCBs are ready for more comps so I guess several models share PCB. The idea is to mod theses 1 way switches so they can be used as 2 way based in their net connections A & B. In order to do this the most important point would be that the PIC firmware is the same loaded in other models like a 2 way......which would make sense in order to reduce production cost. Here follows some pics of the PCBs.



As you might see in the last pic I have encircled the two comps added so far: connector for A&B and a resistor (small circle) in the trace of B. As you know connection A is just L in order to feed the other switches.

I connect them and tray to synchro with no results, the slave one just show intermitent the blue and red leds and the master did nothing when touching it the 5 seconds required. I have to add a buzzer to the PCB to make sure there is no audio signaling.
I did not have too much time yet to keep investigating but firstly I want to reduce the added resistor since I guess is to high for a logic level to be reached, from 22K to at least 1K. Also trace B connection injecting low freq signal, in order to find out if it reachs the PIC and add the buzzer. I want to backup the firm also just in case......
Any suggestion or help is always welcome. Anyone who has this switch but being 2 way etc.