2022-09-21 (W) 24EngBarostat Sound and lights

I added a four-terminal RGB LED with a common anode to the system using more of the header wires. I considered addressable lights, but I won't need that much light, and I have bezels for the single components. I found some threshold values that could trigger with a breath and programmed the light to change accordingly.

I included a speaker with header terminals for testing, but I'll use piezo elements later. The startup sound is a 200 Hz square wave that builds to 700 Hz, then cuts off. Each time the Arduino sees a pressure event, it chirps for a fraction of a second and turns on the light. If there is a sustained pressure increase, it will flash the light and beep intermittently.

I put everything inside an airtight food container, so when I sealed it and pressed the lid, the light registered a significant pressure change and changed the light. The speaker was hard to hear inside the container, but it worked.
Pressure vessel

The rest of the posts for this project have been arranged by date.
First time here?

Completed projects from year 1
Completed projects from year 2
Completed projects from year 3
Completed projects from year 4
Completed projects from year 5
Completed projects from year 6
Completed projects from year 7
Completed projects from year 8

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