AC Mains Detection
- AC Mains Detection - https://learn.edwinrobotics.com/230v110v-ac-mains-detection-using-arduino-raspberry-pi-and-esp8266-thing/#Step2
- LTV8141
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Function of Zero-Crossing
- Delay to connect the AC mains to the target load, so the load receive less power, this can be used to control speed / light
- Active relay on Zero-Crossing, to protect relay and target load, avoid high power shutdown feedback.