Mqtt MP3 Player based on Wemos-D1 ESP8266 circuit and VS1053 audio module

Functionality:

This module was created to be controlled by Node-Red over a MQTT Broker.
The module understands various tags such as:
		 /Zaudio/play  "file to play with extension" 8.3 format
		 /Zaudio/volume xxx (volume in db) 0 to 100db is possible
		 /Zaudio/command stop (will stop the file played)
		
The module also allows to connect a Neoled display module with 7 leds
		 /Zaudio/neoled #xxyyzz  (set color in hex rgb format

Hardware:

Wemos D1 module, SPI bus used to communicate with audio module

Adafruit VS1053 module with 3W amplifier PRODUCT ID: 3436

Micro SD card 128mB our larger FAT format.

Connections:
		Wemos D1		-      VS1053   -   Neoled
		D8						MISO
		D7						MOSI
		D5						SCK
		D4						SD-CS
		D6						MP3-CS
		D3						DREQ
		DO						XDCS
		D2									IN
		+5V						AUDIO +5V	5V
		+3V						DIGIT.+3V

! Use min. 5V 2Amp USB to supply both circuits + LED's

Software Libraries:

Adafruit_Neopixel
Adafruit_VS1053_Library-master
pubsubclient (MQTT library)

Software Main file:

mqtt_mp3_server.ino contains all customized code based on the MQTT client example
wifi_settings.h 	contains the WIFI private setting

Using the Zaudio module with Node-red

Zaudio was tested with a connection to an MQTT brocker running on a RPI3 board
	Software installed was Openhabian with MQTT and Node-red modules installed.

v1.1 rz 21.2.2018	added OTA code
v1.0 rz 28.1.2018   orginial code