Single Channel Relay Module
The output contacts of a relay (including NO, NC, and the common port) works as a SPDT – Single Pole Double Throw switch. Its operating principle is as follow:
VCC—-5V,
GND—-for ground
IN1 connects to the control valve which output 3V-5V
Output contacts: connect to applications
Checkout Our Blog on Relay:
https://piees.blogspot.com/2020/05/single-relay-interfacing-with-arduino.html
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