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3Pcs 1Channel AC 220V Optocoupler Module 220V Voltage Detect 220V Optocoupler Isolation Microcontroller TTL Level 3V 5V June_2023_update 2"(Lx W x H) Product DIY labels 2"(Lx W x H) Product thickness: 0 wonderful accessory The output TTL level can be detected by a microcontroller 1 Channel 220V AC optocoupler module can be used to detect the presence or absence of 220V AC power
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