As we all know, wearing a helmet is mandatory in most countries, including India while driving a vehicle, not just because of ...

He also integrated a 3W amplifier into this build, and everything is controlled by an Arduino including a small LCD screen which ... and also because all of the circuit schematics are available ...

This is Rev. 2 and we looked in on Rev. 7 back in March. That one is a full Arduino, but the circuit board has no substrate.