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GitHub Repository
● batear — Ultra-low-cost, off-grid acoustic drone detector. Edge computing. Protect your airspace with a microphone.
246 starsC
Batear – I built a $15 edge-only acoustic drone warning system
by t841222·Mar 21, 2026·6 points·2 comments
AI Analysis
●●SolidDark HorseWizardry
Goertzel filters on ESP32-S3 detect drone rotors for under $15, no cloud.
Strengths
- •Goertzel algorithm fits entirely within ESP32-S3's 512 KB SRAM constraint.
- •Zero ongoing costs — no cloud subscription, no internet connection required.
- •O(N) per frequency bin makes battery or solar deployment actually practical.
Weaknesses
- •Requires per-environment calibration — not plug-and-play out of the box.
- •Acoustic detection struggles with wind, background noise, and distance variables.
Category
Target Audience
Homeowners, farmers, privacy-conscious individuals
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Aeroscope · DroneShield
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