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KY-019 5V relay module by herrerodani

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[Arduino KY-019 5V relay module](https://tkkrlab.nl/wiki/Arduino_KY-019_5V_relay_module) ![enter image description here](https://tkkrlab.nl/w/images/thumb/c/c1/Arduino_KY-019_5V_relay_module_Sku_121354_1.jpg/400px-Arduino_KY-019_5V_relay_module_Sku_121354_1.jpg "enter image title here")

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