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You must supply a steady, regulated voltage to both 3.3v and 5v pins at all time (see Voltage Inputs on https://learn.sparkfun.com/tutorials/bi-directional-logic-level-converter-hookup-guide/all). Logic level controller does NOT convert 3.3v to 5v for powering the relay, it just let you turn 3.3v signal to 5v so a relay can get activated. Relay's positive ...


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