Updated README with more content

README.md

@@ -8,10 +8,67 @@ Info display powered by two parts:
 ## Requirements
 
 - Arduino libraries
-   - SerialCommand Advanced
-   - serLCD
+   - [SerialCommand Advanced](https://github.com/shyd/Arduino-SerialCommand)
+   - [serLCD](http://playground.arduino.cc/Code/SerLCD)
+     *Note: This is not the official library, but an old one found on the legacy Arduino Playground!*
 - Python libraries
    - pyserial
    - python-dotenv
 
+## Configuration
 
+MAPID is configured using a dotenv file. Currently you have to set three options:
+
+`SERIAL_DEV`
+: Serial device file. `/dev/ttyUSB\*` on Linux, `/dev/cu.usbserial-*` on macOS.
+
+`SERIAL_SPEED`
+: Speed (in Baud) of the serial connection. `9600` is the default value of the Arduino Sketch.
+
+`FIFO`
+: File name for the FIFO. Note that systemd uses a private `/tmp` for services, so the Web-UI cannot access these files, and you have to use a different location.
+
+An example file for GNU/Linux:
+
+```sh
+# Serial device
+SERIAL_DEV="/dev/ttyUSB0"
+
+# Serial baud rate
+SERIAL_SPEED=9600
+
+# FIFO filename
+FIFO="/var/mapid/fifo"
+```
+
+## Components
+
+### `MAPID-CP/`
+
+An Arduino sketch containing the command line os *MAPID/CP* (CP=Control Program). It supports some commands to control a LCD and a LED (there are even a few more non-relevant ones):
+
+- Turn the LED on/off: `ON`/`OFF`
+- Turn the display on/off: `LCDON`/`LCDOFF`
+- Select a line for output: `LINE i`
+- Display some text: `ECHO Foo bar`
+- Clear the display: `CLS`
+
+### `mapid.py`
+
+A Python library used by the other scripts
+
+### `mapid-count.py`
+
+Displays a fake bomb countdown like in one of those action movies. Written as a first test for Pyserial communication with *MAPID/CP*.
+
+### `fifo_bridge.py`
+
+A Python script that provides a FIFO file to pass commands to *MAPID/CP*. Each line read from that file is directly passed over a serial connection.
+
+### `fifo-webui/`
+
+PHP based Web interface for `fifo_bridge.py` supporting all commands of *MAPID/CP* (except for those without a real purpose, that only return some information relevant for interactive serial connections).
+
+### `notification.sh`
+
+Use the LED and display to show a notification, the purpose of the whole MAPID project.