This is a MySensors adapter for Livolo 3 button touch wall switch, US/AU size. It will also work for one button switch by putting components for the central button only.

Features

• replaces Livolo sensor board, no changes to do on main/relay board of the switch
• on/off LEDs like original switch
• 2 extra led indicators on the central button, this will be used for extra functionality when I will have time to improve the basic sketch

Warning I have not received the new revision of the PCB yet, so *DO NOT order at the moment

Changes in version 0.9 :

• remove ground plate below touch pads 1 & 2 for better touch sensitivity
• moved on&off leds a bit further away from the touch pads so they are not directly below the clear part of the glass
• holes to attach a 3D printed plastic diffuser, so the light will be more evenly distributed around the button
• changed connectors for serial programming to be more convenient
• added 2 extra leds on middle button
• improved VCC track to reduce risks of interferences/noise

I don't know why I cannot upload the youtube video link so here it is, just a proof it's running ;) https://youtu.be/0z4vhWA3xJ8

TO DO

• complete this document to put more detailed instructions :)

Installation

• After soldering, just remove the sensor plate from the Livolo switch and put this one.
• Touch button order is the same order than the numbers for connecting the switch wires.
• When connected, it will declare switch sensors 1,2,3 for the 3 buttons + 11,12 for the two extra led indicators
• You need to add a capacitor or the Livolo "light savior" little box to avoid flickering if you have low power lights/leds.

Pins used for touch sensors, leds, relays

Touch sensors

Leds

Relays

As relays are triggered using a decoder that takes a 3 bits "address" as input, it's necessary to have the 3 relay pins on the same register of the ATMega so they can all be changed at the same time. Relay pins are D3, D4 and D7, all on PORTD