ESP8266 MQTT Homie(https://github.com/homieiot/homie-esp8266) based LED dimmer with light sensor (photo-resistor - build in into Witty module) Features:

• dimming - homie/_device_ID_/dimmer/percentage/set (0..100%)
• dimming - homie/_device_ID_/dimmer/absolute/set (0..1000)
• switching - homie/_device_ID_/dimmer/switch/set (ON-dim 100%, OFF- dim 0%)
• timer - homie/_device_ID_/dimmer/timer/set (time [s] of 100% dim)
• Manual ON/OFF by momentary turning off/on power

USED GPIO (ESP1):

• GPIO-3 - RX Line - boot delay detector
• GPIO-2 - Dimmer output (MOSFET)
• GPIO-0 - Homie reset input (pullup + switch to ground)

USED GPIO (WEMOS-ESP12)

• GPIO-14 - bootdelay detector
• GPIO-12 - dimmer output (MOSFET)
• GPIO-0 - Homie reset input (pullup + switch to ground)

RX Line circuit (momentary reboot detector)

               |\ |    _____200k     _____2k
    +3,3V _____| >|---|____|---*----|____|-----*--------->GPIO3 (ESP1)
               |/ |            |               |          GPIO14 (WEMOS)
                             -----47uF        |--| 200k
                             -----            |__|
                              _|_             _|_