% Interaction Techniques and Technologies Assignment 7: Sensors, PyQtGraph % Summer Semester 2021 % Submission due: Wednesday, 16. June 2021, 23:55

Hand in in groups of max. two.

Your task is to get comfortable with Sensors and PyQtGraph

7.1: A short introduction to Digital Signal Processing

Skim the chapters of The Scientist and Engineer's Guide to Digital Signal Processing so that you have a good overview of the topics covered by this guide.

Concisely answer the following questions:

• What is the defining property of Gaussian noise?
• What does a low-pass filter do in general?
• Is a moving average filter a low-pass or a high-pass filter? Why?

Points

• 2 Good answer to first question
• 2 Good answer to second question
• 2 Good answer to third question

7.2: A Sensor Game

Write a small Python application dippid_game.py that takes the port of a DIPPID device as its only parameter. This application should implement a fun game that involves your device:

• The application should import DIPPID (do not modify DIPPID.py itself).
• On launch, print instructions for the game to stdout or show them in a Qt window.
• Automatically connect to the DIPPID device with the given Port.
• Utilize at least two input modality of the DIPPID device
• If you want, you may also implement a graphical user interface for the game - but you can also just use the DIPPID device without any display.

If you are looking for inspiration on game concepts, check out e.g., Bop It or ball-in-a-maze puzzles.

Hand in the following file:

dippid_game.py: a Python script that implements your game

(Please also hand in the DIPPID.py version you are using)

Points

• 1 The python script has been submitted, is not empty, and does not print out error messages.
• 1 The script is well-structured and follows the Python style guide (PEP 8) and contains comments in regard of workload distribution.
• 2 The game is fun to play (at least a little bit)
• 1 The game utilizes at least two input modalities of the DIPPID device

7.3: A custom PyQtGraph flowchart using the SensorNode

Read the source code for DIPPID-pyqtnode.py (from the DIPPID.py GitHub repository) and the PyQtGraph documentation. Install the PyQtGraph Debian package (e.g. sudo apt install python3-pyqtgraph Write a small Python application analyze.py that takes the Port of a DIPPID device as its only parameter. This application should generate a PyQtGraph flowchart with the following elements:

• a DIPPIDNode.
• a BufferNode (see DIPPID-pyqtnode.py) for each of the accelerometer channels,
• three PlotWidgets that plot the accelerometer data for each channel and another PlotWidget that displays the output of the NormalVectorNode (see below)
• a NormalVectorNode (to be implemented by you) that calculates the rotation around one axis from the accelerometer values of the other two axes and outputs a vector (i.e., two 2D points) that can be plotted by a PlotWidget to indicate the rotation (see video in GRIPS) - this node should accept accelerometer values on its two input terminals and provide a list/tuple of two tuples, such as ((0, 0),(1.0,1.0)) on its output terminal.
• a LogNode that reads values (e.g., accelerometer data) from its input terminal and writes them to stdout.

Your application should import DIPPID-pyqtnode.py and use the two nodes defined there.

Hand in the following file:

analyze.py: a Python script that implements this flowchart.

Points

• 1 The python script has been submitted, is not empty, does not print out error messages and follows follows the Python style guide (PEP 8).
• 2 The script correctly implements and displays a flowchart.
• 2 The script correctly reads accelerometer data from the DIPPID device and plots it.
• 3 The script contains a working NormalVectorNode as described above.
• 1 The script contains a working LogNode as described above.

Submission

Submit via GRIPS until the deadline

All files should use UTF-8 encoding and Unix line breaks. Python files should use spaces instead of tabs. If you need to submit further supporting files, please add a comment describing their use.

                                                           Have Fun!