Hi bigclownians.
Happy Christmas time and PF 2019.
I would like to introduce my project.
I call them multiwave.
It is simple tone generator. Tones will be generated in realtime (to D/A converter with connected earphone(s)) based on measured distance using a pair on HC-SR04P distance sensors.
Tones are simply cosine waves on multiple frequencies.
First proximity sensor control frequency of cosine waves => frequency of tones.
Second proximity sensor controls loudness.
Project stages
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[spoiler]Proof of concept.[/spoiler]
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[spoiler]Early prototyping stage[/spoiler]
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Prototyping stage. (2018-12-29T23:00:00Z)
Some aspect of project has been already discussed here and here.
Things used in this project
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Solderless breadboard (not necessary)
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Dupont line (can be replaced by standard electric wire)
What’s working now.
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Playing pre-generated buffer i.e. sine wave (on multiple frequencies) from buffer(s) some background here and discussed in this topic.
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Measuring distance by multiple proximity sensors described here (Czech explanation) all credits to @martin.grames and discussed here.
TO-DO
- Generating sine / cosine wave in real-time
working in progress. - Tuning loudness logarithmically.
- Project and print enclosure.
- Manny minor stuff.
Photos of prototyping stage.
Generating tones to earphone(s).
Measuring distance with logging to console.
Possible extensions
- Tuning frequencies logarithmically.
- Measured distance shown on smart led strip inspiration here and codes here all credits to @martin.grames.
- Generating tones from white noise using filter(s).
Credits
Thanks @hub.martin for advices and support.
Thanks @martin.grames how proximity sensors workaround and support.
Summary
This project is optional task for the courses Signals and Systems taught at FIT BUT.
All ideas and notes welcome! 
