Sound grenade for Airsoft [Part 2: Electronics]

Let’s get started on the second part of the sound grenade build, this part focusing on soldering, programming and assembling the electronics into the enclosure. For instructions on how to make the 3D-printed enclosure, check out Sound grenade for Airsoft [Part 1: Enclosure]. I decided to use an ATtiny85 microcontroller and the Arduino environment because