Multi-Channel AC Dimmer Control: 2CH and 4CH Guide Feb 26, 2026 0 17 FAQ TL;DR: 2CH 8A and 4CH 10A modules share one ZC pin across all channels. Each channel has its own DIM pin. One interrupt call in code covers all channels; brightness is set independently per channel ha... Arduino ESP32 ESP8266 RBDdimmer ac-dimmer multi-channel tutorial Read more