ESP8266 DC 5/12/32/220V WiFi Wireless Relay Module Smart Home Automation
ab 3,71 €
NO4: Normally open, the relay is left unconnected before it is sucked in, and it is short-circuited with COM4 after pull-in. Step 1: the 12V/1A power adapter, the positive and negative poles of the power are connected to IN+ and IN- of the module respectively.
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