The document discusses Ulyxes, an open source Python library for connecting to sensors and instruments. Ulyxes provides a sensor object model that defines interfaces for physical devices, measurement units, readers, and writers. This allows logging sensor data to files, databases or HTTP. The library is used in educational and industrial applications through its Python API and apps. It has been in development since 2008 and is maintained in a GitHub repository.

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BackgroundBackground
● Geo for All Lab since 2014
● Lab of the month in August 2016
● OSGeo charter member since 2014
● Contributions to QGIS, OSGeoLive, RTKLib,
p.mapper, GNU Gama
● Using and teaching QGIS, GRASS, PostGIS,
MapServer, OpenLayers, Proj, GDAL, ...
● Open source projects maintained:
Ulyxes, GeoEasy and QGIS plugins
http://github.com/zsiki

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UlyxesUlyxes
● Started in 2008 (Tcl and C++)
● Changed to Python in 2012
● Based on PySerial, GNU Gama, OpenCV, etc
● 3 in 1 like an instant coffee
coffee: research and coding
sugar: industrial applications
milk: educational usage
● Parts:
coffee: Ulyxes PyAPI,
sugar: PyApps,
milk: server scripts

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Repo on GitHubRepo on GitHub
First commit on September 6, 2014

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Sensor object modelSensor object model
Interface Measure unit
Writer
(optional)
Physical
device
Data
Serial/USB/
Bluetooth/i2c
file (CSV, XML),
SQLite database,
http (to RDBMS)
Logical device
●Set up messages
●Parsing answers
Reader
(optional)
file (CSV, XML),
SQLite database,
http (from RDBMS)

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Detailed object modelDetailed object model (PyAPI 2018 Aug)
Iface
SerialIface LocalIface
Instrument
TotalStation GNSS
MeasureUnit
NmeaGnss
Leica
WebCam
USBIfaceLeicaDna
Trimble5500
Writer
FileWriterHTTPWriterImageWriter
VideoWriter
Video
DigitalLevel
CSVWriter
VideoIface
Logging
TCA1800 TPS1200
TCRA1100
~5700 line of code
~1200 line comment
~50 module/class
Planned
BluetoothIface
Not finished
Ready
Used Python
modules
serial
cv2/cv
pyusb
I2CIfaceBMP180Unit
smbus
BMP180 LSM9DS0
LSM9DS0Unit
Angle
Reader
Independent
classes
WebMetUnit
Base class
Key
WebMetWifiCollector
WebIface GamaIface
CSVWriter EchoWriter GeoWriterSqLiteWriterLSM9DS0
Wifi

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UML sequence diagramUML sequence diagram
Sensor Measure unit Interface Writer
Logical message
Sensor dependent
message
Send message
Device dependent
answer from sensor
Answer
Processed
data
Processed
data
physical
sensor
e.g. GetMeasure
e.g. %R1Q,2108:15000,0
e.g. %R1P,0,0:0,0.9973260431,1.613443448,1.3581
e.g. {‘hz’:0.9973260431,‘v’:1.613443448,‘distance’:1.3581}
file,
database,
http, etc.

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First applicationFirst application

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Educational usageEducational usage
Automation for surveying (Msc subject)
Train the
trainers

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Let’s ride togetherLet’s ride together
Zoltán Siki, Bence Takács, Csaba Égető
siki.zoltan@epito.bme.hu Takacs.bence@epito.bme.hu, egeto.csaba@epito.bme.hu