This design is the hardware for the Caracal Evo (2021) board variant. This is an acoustic array, specifically targetted towards unattended bioacoustic monitoring.Specific features include:8 bottom port MEMS microphonesUSB-DFU capable (can be easily flashed/programmed over USB)Power from USB or external (6-12V)Small, circular board (8.4 cm radius)Low cost BOM (~USD30 per unit in 100 qty)An earlier version (shown in the left image below) has been trialled in Zimbabwe and Kenya.This is a multichannel audio recorder, which allows for:precise, GPS-aided, timing between stations for Time Difference of Arrival (TDoA)the capability of estimating bearing/Angle of Arrival (AoA) from a single stationThe plot below shows a hyena call recorded on two stations - top four plots are from Station A, bottom four plots are from Station B. Note the time delay between Station A and Station B.This work has been published in:Wijers, Matthew, Andrew Loveridge, David W. Macdonald, and Andrew Markham. "CARACAL: A versatile passive acoustic monitoring tool for wildlife research and conservation." Bioacoustics 30, no. 1 (2021): 41-57.Check here for the full repository:https://github.com/OpenWild/CaracalEvo_HW
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