ldrop

Data recording sensor api and gui.

What is ldrop?

ldrop is a more open version of drop that does not require any predefined structure for the experiment. ldrop is aiming to be a library which provides user a sensor-API to be easily used with their own scripts.

System requirements

ldrop is not platform dependend by nature. However we use Linux because python is easiest to use on Linux.

Install instructions

run the following commands:

sudo apt-get install python-pip
sudo apt-get install git
sudo apt-get install python-gtk2
pip install git+https://github.com/infant-cognition-tampere/ldrop.git

How to use ldrop?

[API design not final]

import Ldrop

# create instance of your experiment class (suggested to inherit
# from pyee EventEmitter)
exp = MyExperiment()

# create instance of drop controller
ldrop = Ldrop.DropController()

# set parameters and callbacks for the controller to control experiment
ldrop.set_experiment_id("myexp")
ldrop.set_callbacks(exp.on_play, exp.on_stop, exp.on_continue, exp.on_data)

# ldrop to listen events emitted by experiment
ldrop.add_model(exp)

# add a sensor to record data during experiment run
ldrop.add_sensor('null')

# enable graphical user interface (optional)
ldrop.enable_gui()

# start drop mainloop
ldrop.run()

API

Signals between ldrop components are transported through pyee.EventEmitter.emit().

Signals listened by ldrop controller

• "tag" - sends a tag to all connected sensors with timestamp now [dict]
• "start_recording" - begins recording on all connected sensors [savesubdir, savefilestr]
• "stop_recording" - ends recording on all connected sensors and saves recorded data []
• "query" - invoke a popup question to user [msg, title, (option1, gtk.response, ...), [callback1, ...], [parameter1(/None), ...]]
• "log_message" - appends a string on possible GUI log [str]

Callbacks required on experiment-file

• on_play - is run when play-button is pressed, Play_callback will run automatically on start if on no gui-mode
• on_stop - is run when stop-button is pressed
• on_continue - is run when continue-button is pressed
• on_data - is run when a data packet arrives from any sensor

Example experiment structure

Dependencies and instructions here are specific to certain ICL experiments.