Arduino Nano as Mains Zero-Crossing Detection Tool. - J4v1987/Mains-zero-crossing-detector. Skip to content. Navigation Menu Toggle navigation. Sign in Product GitHub Copilot. Write better code with ...

[Connornishijima] has stumbled on a different way to detect motion with an Arduino, ... If it were mains hum then the Arduino could measure it’s period to confirm. Report comment.

Full-wave rectifies mains signal and compares it to a near-ground VDC signal to produce a 'zero' crossing signaling pulse. Comparison yields a current-sinking pulse, normally high. Pin D3 receives a ...