What would you need to create a small device that would recognize a beep and play a random sound consequently?

The random sound played would be a selection of a short mp3 sound out of 3 preset sounds.

rickharris5 years ago
1. Something to detect the beep

2. Something to play the sound

1. A microphone, an operational amplifier to amplify the sound, something to make the sound into a pulse - Personally I would use a microprocessor and feed the sound into the analogue input and detect level or use the counter function to detect a given frequency.

2. Depends on the type of sound you want - The microprocessor will make simple sounds or trigger an MP3 player for more complex sounds.

This isn't going to be a beginners project I suggest you start by reading through

...or the old 567 tone decoder....