Description
Bat Ears is a full featured Pi Pico based Bat detector/Listener kit that is easily constructed with through hole and soldering iron. Giving a bat listener that will change the inaudible calls and echo location sounds from many species of bat into the audible range.
It does this in one of three selectable ways. “Time dilation” will record and playback the received sound at 1/20th of the speed lowering the frequency and increasing the duration of the call.
“Divide” will change the frequency of the incoming sound digitally, but not its duration and “Heterodyne” mixes the incoming sound with a carrier, to move the sound into the audible range with an analogue mixing process, again not affecting the duration of the call.
The Frequency spectrum of the received audio is displayed as a graph on the display, and bat sounds can be saved to an SD card at 384000 samples per second for later playback/analysis.
This Bat detector has a range of 20Khz to over 80Khz which is enough to detect and listen to most species of bats .
Powered from 4 x AAA cells in its contained battery holder it can give many hours of field use.
The detection of bat calls is signalled by an LED and can also alert other equipment with a trigger out connection.
The bat detector project runs with its own open source software available from https://github.com/ExtremeElectronics/BatEars
This kit will be available from April.
