• VL-C701X-2 (ver C0)
• VL-C702X-2 (ver C1)

I have my progress so far dumped at: https://github.com/jamarju/livolo-firmware

https://www.youtube.com/watch?v=t0wluQbNzUw

My goal is to minimize manipulation of the actual switch by reprogramming the original PIC16F690 with a custom firmware (see github above), and soldering 3 cables to the RF connector, which is an empty through-hole header so it's an easy enough mod.

Unfortunately the Livolo GND is actually referenced to the LIVE wire, so I had to use optocouplers to talk to an FTDI232 module safely.

But then I found yet another problem: the optocouplers draw too much current from the Livolo power supply, which is designed to give just enough milliamps for the PIC and the blue/red LEDs, so I had to use a battery to get the extra oomph...

The final goal is to talk to an ESP8266, which I'll use to relay network commands.

Since the battery thing is an absolute no-go, I'm considering powering the ESP8266 externally, make sure the DC side floats, then hooking the PIC's TX, RX and GND directly to the ESP8266 UART, and put it somewhere hidden enough so that it doesn't kill anyone.

Is there a better way to isolate the dangerous side from the "kids friendly" side?