42 lines
1.2 KiB
Markdown
42 lines
1.2 KiB
Markdown
# Hardware Prototype Specs
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## Components List
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### Main Unit (Faux Rocher)
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- Raspberry Pi 4 (4GB)
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- Waveshare 4G HAT
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- Solar charge controller (MPPT)
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- LiFePO4 Battery (12V)
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### Underwater Unit
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- Hydrophone
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- Reco: 192 kHz sampling, useful band 5 Hz–118 kHz
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- Pressure + temperature sensor (MS5837-30BA)
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- Conductivity sensor/probe (TBD)
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### Cables & Connectors
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- IP68 underwater connectors
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- Shielded audio cable (~5m)
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## Power / Energy Budget (estimation)
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**Inputs (production)**
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- Solar panel: **100 W**
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- Assumption: ~4 h/day equivalent full sun, ~70% end-to-end efficiency (MPPT + wiring + battery charge)
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- Energy/day (order of magnitude): **~280 Wh/day**
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**Outputs (consumption)** (order-of-magnitude, to be measured)
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- Raspberry Pi: ~5 W
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- 4G modem: ~2–6 W (depending on uplink)
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- ADC + sensors: ~0.5–1.5 W
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- Total average: **~8–12 W** → **~190–290 Wh/day**
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**Battery sizing example (12V LiFePO4)**
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- 24h autonomy: ~16–24 Ah
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- 3 days autonomy: **~50–75 Ah**
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**Transmission strategy**
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- If 4G throughput is OK: stream raw audio continuously.
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- If throughput is low: apply light denoise/filtering + compression to avoid transferring mostly noise.
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- If very low: send clips/events/features.
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