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I have a relay module exactly like the one on the next page : https://microcontrollershop.com/product_info.php?products_id=5919

I wanted to consult you about the correct way to use it. I connected the 5V port of my RPi to "+", GND to "-" and "S" to GPIO17.

1- In the first measure when directly connecting the module to the RPi, take the current between the gpio port and the "S" (SIGNAL) output, and measure a value of 4 mA.

2- In addition, I made the previous connection but I connected between "s" and the gpio a resistance of 2.2 K, took its current and obtained a value of 0.42 mA.

3- The voltage difference between + and - is 5 V.

4- The voltage between "S" and "-" is 3.30 V.

I could use one of the 2 previous connections (Point 1 or 2), or I should add an additional transistor ?(I have seen several websites but I have doubts about the connection with the module I have). I'm currently using point 2 without problems but I'm afraid of damaging my Rpi.

Greetings.

Seba San Blas
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1 Answers1

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The connections you have made are fine.

You don't need the resistor in series between GPIO 17 and S. However if the relay still operates it will not do any harm to leave it there.

The relay board itself has the circuitry needed to protect the Pi from the relay load.

joan
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