[CNX-Software] - Silabs EFM32-based HydroMoth enables underwater acoustic data recordings

Open Acoustic Devices’ HydroMoth is the underwater equivalent of the AudioMoth full-spectrum acoustic device that records audio samples mostly to monitor wildlife. Still based on a Silicon Labs EFM32 Wonder Gecko MCU, the HydroMoth is firmware-compatible with AudioMoth, enables audio recording at up to 60 meters deep, and has been tested to last two months at a depth of 30m using three AA batteries. HydroMoth key features and specifications: Wireless microcontroller – Silicon Labs EFM32 Wonder Gecko Cortex-M4F MCU @ 48MHz with 256kB Flash, 32kB RAM Storage – MicroSD card slot to store audio data Audio capture Onboard analog MEMS microphone acting as contact hydrophone Analog preamplifier with adjustable gain Uncompressed WAV from 8k to 384k samples per second USB – Micro USB Type-B port for configuration and reprogramming of the flash Misc Onboard RTC to track time in UTC timezone Improved 32.768 kHz MEMS oscillator to reduce clock drift [...]

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