Also, maybe the relay as a single component can be triggered by V, but it is likely that the LED would burnout with 12V with the KY? This PDF should have the correct schematic in it. Hi, nice article, but not sure where you got your specification for the KY module from, it is incorrect. Right-click on the module and select Edit new parts editor. You can extract the SVG file using Fritzing. Would you be willing to share your SVG files with me? I will do the same when done. I have a slightly different relay and would like to modify this to match. Running the sketch will cause the lamp to light up intermittently. On the DC side of the board there are 3 pins for signal, power and ground.
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