10
4.11.5 Microphone - AKU340
The CISS contains the microphone AKU340.
The CISS housing, with its membrane, is not optimized for sound measurements, only the noise level is determined and sent
by the CISS firmware.
Directivity Omni-directional
Frequency response ±3 dB 60 Hz – 12.5 kHz
Signal-to-noise ratio 62 dB
Tolerance at -38 dB ± 2 dB
Sampling rate BLE: ≤ 1 Hz
Note: Access to the microphone is only via BLE possible.
4.11.6 Ambient light sensor - MAX44009
The surrounding illumination can be measured with the light sensor MAX44009. It is located beneath the white cover of the
CISS. The adapted measurement parameters inside the housing are given in the table below:
Dynamic range 0– 2112800 Lux
Maximum resolution 1 Lux
Maximum integration time at low light 800 ms
Accuracy at 538 nm wavelength,
25 °C ambient temperature
15%
Sampling rate BLE / UBS: ≤ 1 Hz
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