In general this commit resolves the comments received for the last tw…

…o commits in the pull request #859 discussion.

- moved all files into teh components directory into the sub-dircetory /components/displays/HD44780-i2c/
- added shebang for Python3 for the driver and the main script
- removed the path to the executable (python3) from the sample service file
- added README.md file which describes the features, usage and installation of the code.

components/displays/HD44780-i2c/README.md

@@ -0,0 +1,57 @@
+The following files allow using LCD displays based on HD44780 connected via i2c bus for this project. The following displays have been used for testing:
+- 2x16 display
+- 4x20 display (recommended as more information can be displayed)
+
+Various informations such as artist, album, track_number, track_title, track_time and many more can be displayed see main script for more display options.
+
+The required files are:
+- components/displays/HD44780-i2c/i2c_lcd.py
+- components/displays/HD44780-i2c/i2c_lcd_driver.py
+- components/displays/HD44780-i2c/i2c-lcd.service.default.sample
+- components/displays/HD44780-i2c/README.md
+
+
+The first file is the main LCD script that makes use of I2C_LCD_driver.py.
+The second file is the library needed to drive the LCD via i2c, originates from DenisFromHR (Denis Pleic) see http://www.circuitbasics.com/raspberry-pi-i2c-lcd-set-up-and-programming
+The third is used as sample service file that runs the i2c_lcd.py main script at boot-up if the service is properly installed (install description can be found below.).
+The fourth file is this file which describes the features, usage and installation of the code.
+
+### Installation
+
+1. You need to install additional python libraries. Run the following two command in the command line:
+`sudo apt-get install i2c-tools python-smbus python3-numpy python-mpdclient python-mpd`
+`pip install smbus numpy python-mpd2`
+2. You need to know which I2C bus your Raspberry Pi has available on GPIOs:
+`ls /dev/i2c-*`
+It'll output "/dev/i2c-x", where x is your bus number. Note this bus number as you will need it in step 6.
+3. Now detect the adapter by using the i2cdetect command, inserting your bus number:
+`sudo i2cdetect -y bus_number`
+The I2C address of my LCD is 27. Take note of this number, it will be need in step 6.
+4. if i2cdetect is not found install i2c-tools
+`sudo apt-get update`
+`sudo apt-get install i2c-tools`
+5. Next we need to install SMBUS, which gives the Python library we’re going to use access to the I2C bus on the Pi. At the command prompt, enter
+`sudo apt-get install python-smbus`
+6. Modify "i2c_lcd_driver.py" line 19 which reads "I2CBUS = 1" and adapt it to your bus number (see step 2.) Furthermore modify line 22 which reads "ADDRESS = 0x27" and adapt it to your I2C address (see step 3.)
+7. Modify "i2c_lcd.py" to adapt it yo your specific display e.g. 2x16 or 4x20 (default). The lines 15-19 look like the following:
+```################# CHANGE YOUR SETTINGS HERE!!! ###########################################
+## Display settings                                                                     ##
+n_cols = 20                 # EDIT!!!  <-- number of cols your display has              ##
+n_rows = 4                  # EDIT!!!  <-- number of rows your display has              ##
+val_delay = 0.4             # EDIT!!!  <-- speed of the scolling text                   ##
+```
+Check if "n_cols" and "n_rows" need to be changed and modify them if necessary. The "val_delay" constant leave for the time being. Lower values will speed up things but will make the text less visible/readable.
+
+8. next install and start "i2c-lcd.service"
+`sudo cp /home/pi/RPi-Jukebox-RFID/components/displays/HD44780-i2c/i2c-lcd.service.default.sample /etc/systemd/system/i2c-lcd.service`
+9. register service by running, it will thereby start on the next boot-up
+`sudo systemctl enable i2c-lcd`
+10. reboot and enjoy!
+For test purposes you can use the following command to start and stop the service without rebooting
+to start the service instantly run
+`sudo systemctl start i2c-lcd`
+to stop the service instantly run
+`sudo systemctl stop i2c-lcd`
+
+Best regards,
+Simon

misc/sampleconfigs/i2c-lcd.service.default.sample → components/displays/HD44780-i2c/i2c-lcd.service.default.sample

@@ -7,7 +7,7 @@ User=pi
 Group=pi
 Restart=always
 WorkingDirectory=/home/pi/RPi-Jukebox-RFID
-ExecStart=/usr/bin/python /home/pi/RPi-Jukebox-RFID/scripts/i2c_lcd.py
+ExecStart=/home/pi/RPi-Jukebox-RFID/components/displays/HD44780-i2c/i2c_lcd.py
 
 [Install]
 WantedBy=multi-user.target

scripts/i2c_lcd.py → components/displays/HD44780-i2c/i2c_lcd.py

@@ -1,3 +1,4 @@
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 import i2c_lcd_driver
 from time import *

scripts/i2c_lcd_driver.py → components/displays/HD44780-i2c/i2c_lcd_driver.py

@@ -1,3 +1,4 @@
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 # Original code found at:
 # https://gist.github.com/DenisFromHR/cc863375a6e19dce359d