The analog sensor on the Arduino board senses the voltage on the analog ... Here, we are feeding the input voltage to the analog pin (A0) using a simple voltage divider circuit comprising resistors R1 ...

The theremin is based on a simple LC oscillator built around a 7400 quad NAND gate IC, a wire antenna, and a few caps and resistors ... the Arduino. Every time there’s a change in the voltage ...

Wyatt]’s CPUVolt library provides a fast way to measure voltage using no external components, and no I/O pin. It only applies to certain microcontrollers, but he provides example Arduino code ...

It may look a little shoddy, but what’s amazing is that this very functional 3-D interface was built by a hobbyist with parts most DIYers can find in their couch cushions—six resistors ...