This is a sketch for controling/reading a benq projector using an esp8266, and the serial port
Install https://github.com/bloft/EasyMqtt as a library
The hardware consistes of A Wemos D1 Mini, Wemos proto shield, and a RS232 board
easyMqtt/15768393/power ON
easyMqtt/15768393/model W1110S
easyMqtt/15768393/source RGB
easyMqtt/15768393/lamp/mode LNOR
easyMqtt/15768393/lamp/time 84
easyMqtt/15768393/audio/mute OFF
easyMqtt/15768393/audio/volume 10
easyMqtt/15768393/picture/aspect AUTO
easyMqtt/15768393/picture/sharpness 15
easyMqtt/15768393/picture/brightness 50
easyMqtt/15768393/picture/contrast 50
easyMqtt/15768393/picture/mode FOOTBALL