For example, an early 90s stereo using the ... of volume controls and such is resumed. In final form, a Bluetooth module and Arduino Pro Micro are stuffed inside the stereo along with a DPDT ...

In this particular example, there is a ... I cut the trace leading to the Bluetooth interface module and soldered a wire so the switch now pulls an Arduino pin to ground when pressed.

When comparing the Raspberry Pi and Arduino, it's no secret that ... like ultrasonic sensors and LCD modules. The libraries even come with example codes for your convenience.