![]() ![]() ![]() No additional components needed in connecting "IN" to a GPIO pin of the Pi 1. Setting the GPIO pin HIGH (and thus outputting a voltage greater than 1.2 V) will untrigger the relay. So pulling this pin low (think connecting to GND or setting an output GPIO pin to LOW) will trigger the relay. The pin labelled "IN" reads "This module is low-level trigger, the voltage value between 0-1.2V". Conclusion here: no additional diode is needed. The board includes a transistor and a diode - and while it is impossible to tell from the image without looking at the wiring and/or schematics - it is reasonable to believe this is the freewheel diode you're refering to. I am interpreting the picture of the printed circuit board of the relay module with accompanying notes as follows:
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