Hello, I bought an Arduino ESP32 on AliExpress. I'm doing some projects but I can't use relay modules when I give digitalWrite(PINRELAY, HIGH) or digitalWrite(PINRELAY, LOW). The relay module doesn't make the transition. I don't know if I'm using the wrong board in the IDE or if I have to use a spec…

I did what they told me to do, putting 5v to power the board with an external power supply, connecting the relay directly to that power supply and it worked, thank you very much. :slight_smile:

yes, but is this module necessary to have a 5v signal? or will it only be necessary to power the module with 5v?

Connecting that 5V relay to your 3.3V ESP could damage the ESP. You will a transtor to drive the relay.

ahh ok, so I can't use this module with the arduino esp32?

[image] pretoet: yes, but is this module necessary to have a 5v signal? or will it only be necessary to power the module with 5v? Both

[image] pretoet: so I can't use this module with the arduino esp32? Yes you can

Hi @pretoet , Welcome, [image] pretoet: The relay module doesn't make the transition. I don't know if I'm using the wrong board in the IDE or if I have to use a specific relay. Please remember the ESP32 outputs are 3,3V, some of those relay modules are 5V, at least the VCC for driving the re…

[image] pretoet: how can i use You nee one resistor and one transistor like this: Connect relay Vcc to 5V. [image] Do not connect the relay IN pin directly to the ESP, you may damage the ESP.

Hi @pretoet , [image] pretoet: yes, but is this module necessary to have a 5v signal? or will it only be necessary to power the module with 5v? The 5v is for the module working, for the signal the 3v3 is enough. More, if the module is being powered from the USB connector, you can drain 5V f…

Hi @jim-p , [image] jim-p: Do not connect the relay IN pin directly to the ESP, you may damage the ESP. Your's the safe way to go, but I've done it and worked with no problems, as long as the drain is low... Gaby.//

Relay module doesn't work on esp32

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ZX80 January 23, 2025, 2:33pm 19

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Relay module doesn't work on esp32

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