They're good, cheap and work just fine. I tested them with a 3.3v digital output (esp32) and they worked correctly, but I buy some boost modules to match the 5v relay coil voltage just to make sure I don't get any surprises. Future. NOTE: THEY ARE ACTIVATED WHEN THE OUTPUT 0 IS DETECTED V (DIGITAL LOW). In other words, they work in reverse, just like a regular relay.
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