# skyglow

Python program written for the ecoLux project in the ecoTron to periodically set light-intensities of the LED's in the ecoUnits.

<ul>
<li>Parses a file containing the time and light intensities (mlx) for the moon</li>
<li>Converts the lightintensities to a DMX-Value (0-255)</li>
<li>Sets the moon-LED and 3-lightpollution LED's for each ecounit</li>
<li>logs the time and value</li>
</ul>

This was tested and run on a Raspberry Pi connected via DMX to the LED's in the ecounits. 
OLA (Open Light Architecture Framework) is used to write to the DMX-Bus.

##Usage##

```console
	skyglow.py
```
will look for a file called **moon** in its directory, to extract the intensities of the moon for the current time. Alternatively you can also pass a file as an argument.
```console
	skyglow.py /path/to/moon/file
```

If everything worked, a line should be added to skyglow.log:
```
	#date				moon[mlx] moon[dmx]		lightpollution[mlx]
	2020-07-21 15:00:00 	0.05	11	[15, 54, 4, 19, 0, 1, 5, 0, 40, 12, 123, 123]
```
The indices of the list containing the lightpollution valus refer to the number of the ecounits.

##Setup##

###Building OLA###

In order to get a recent version with python support we need to build OLA.
See [this](https://www.openlighting.org/ola/tutorials/ola-on-raspberry-pi/) and [this](https://www.openlighting.org/ola/linuxinstall/#Debian_Ubuntu) for details.

Install libraries (Python 2.x):
```console
	sudo apt-get install libcppunit-dev libcppunit-1.15-0 uuid-dev pkg-config libncurses5-dev libtool autoconf automake g++ libmicrohttpd-dev libmicrohttpd12 protobuf-compiler libprotobuf-lite17 python-protobuf libprotobuf-dev libprotoc-dev zlib1g-dev bison flex make libftdi-dev libftdi1 libusb-1.0-0-dev liblo-dev libavahi-client-dev python-numpy
```
Clone repository:
```console
	git clone https://github.com/OpenLightingProject/ola.git ola
	cd ola
```
Configure for python:
```console
	autoreconf -i
	configure --enable-python-libs
```
Build 
```console
	make -j4 	 #run on 4 jobs (use nproc to check number cores)
	make -j4 check
	sudo make install
	sudo ldconfig 
```
Run the daemon:
```console
	olad
```
###new moonfile###
If you acquire a new moonfile, make sure to replace all occurrences of **24:00** to **00:00**.
Otherwise python will throw an error.
```console
	sed -i 's/24:00/00:00/g' moonfile
```
###cron###
Set up a cronjob to check for new values every minute. Run
```
	crontab -e
```
and insert
```
	PATH=/usr/bin:/path/to/directory/containing/skyglow/
	* * * * * skyglow.py
```

Check the `skyglow.log` to see if it gets updated every minute.
```
	watch -n1 tail skyglow.log
```