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What VCC of AC dimmer module?
VCC needs the same logic level as the MCU. For ATmega = 5V, ESP32/8266 = 3.3V, STM32 = 3.3V
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How to choose AC dimmer module?
Bysupport
The main parameter is current power (Ampere/Watt). We recommend that the device load power value be no over than 70% of the dimmer value. Example: Dimmer 8A (230V*8A=1.8kWt), load = 8A*70%=5.6A (230V*5.6A=1.3kWt).