Raspberry Pi enthusiasts interested in creating an ultrasonic bat detector may be interested in a project published by Tegwyn Twmffat to the Design Spark website earlier this year. A Raspberry Pi mini ...

The range of human hearing goes up to about 20 kilohertz, which is fine for our purposes, but is pretty poor compared to plenty of other animal species. Dogs famously can hear up to about 60 kHz, and ...