I have a 5V relay. I connect 5V and GND. I switch the pin to low on the relay and 4.2V appears on the relay pin IN, which is wrong. If I connected the analog PIN from the ESP32 to the relay pin IN, I would boil the ESP32.
Is this a relay module?
Can you post a link to the module?
Post your project schematic...
A drawing speaks more than 1000 words.
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When you post your schematic be sure to include all connections, power, ground and power sources.
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