This is a 5V standard Relay interface card, it has normally open and normally closed contact and can be controlled directly by large number of microcontrollers such as Arduino. Its widely used in industrial applications, PLC control, smart home control …The module has an output LED to indicate relay output status.
You can use this module to control high voltage systems for example a refrigerator, AC, and TV using a 5 V power supply, by simply connecting it to your module.
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