Use Gyroscope in BallChallange

[DavidFederl]

Add Gyroscope measurement with 1.6kHz and publish to different topic.

ToDo

• Rename topic from g-value to acceleration
  • Update Cloud App #27
  • Update enV5 Code Base #22
• Implement Gyroscope Usage read with 400Hz
  • Implement read from gyroscope and Publish Data to topic .../gyroscope
  • Make CSV Service store publish to gyroscope
• Implement Gyroscope Usage read with 1600Hz
  • Update read data implementation
  • Make CSV Service store publish to gyroscope

Remarks

Caution

When reading with 1600Hz the internal RAM of the RP2040 (260KB) is to small to store all data!
Amounts to around (only one topic):

$$\#_{\text{Bytes per sample}} \cdot \omega_{\text{measurements}} \cdot \Delta_{\text{recording}} = 14 \cdot 1600Hz \cdot 5s = 112000B \approx 110KiB$$

Solutions:

• Intermediately store data on Flash Chip (512B per page / 256KiB)
• Publish data in chunks (~1000 samples)

[DavidFederl]

waiting for es-ude/elastic-ai.runtime.enV5#282 (comment) to be merged

[DavidFederl]

To overcome memory shortage on the ESP32 side we will split up the measurement into groups of around 800 samples. With a measurement frequency of about 1.6kHz this would lead to 6 published batches for one cycle of 3 seconds.

This can be accomplished by providing a ID for the measurement request under which the data will be published.

sequenceDiagram
    participant S as CSV-Service 
    participant E as enV5
    Note over E: sub[.../DO/measurement]
    S ->> E: pub[.../DO/measurement , <ID>]
    Note over S: sub[.../DATA/gyroscope/<ID>]
    Note over S: sub[.../DATA/accelerometer/<ID>]
    Note over S: sub[.../DONE/measurement]
    Note over S,E: show countdown
    loop for 3 seconds
        par gyroscope
            Note over E: measure with 1600Hz
            E ->> S: pub[.../DATA/gyroscope/<ID> , batch (~800 samples)]
        and accelerometer
            Note over E: measure with 800Hz
            E ->> S: pub[.../DATA/accelerometer/<ID> , batch (~800 sampkes)]
        end
    end
    E ->> S: pub[.../DONE/measurement , <ID>]
    Note over S: unsub[.../DATA/gyroscope/<ID>]
    Note over S: unsub[.../DATA/accelerometer/<ID>]
    Note over S: unsub[.../DONE/measurement]

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