Connection of 3.3V PIR sensor on 15-20m cable - interference, voltage drops

The discussion concludes that a 3.3 V PIR sensor over a 15–20 m cable cannot be judged reliably without knowing the sensor output type, receiver input requirements, cable type, routing, and interference conditions. Long cable runs can cause edge degradation, signal delay, voltage drop, and noise pickup, making logic levels difficult to detect. A relay contact or open-collector/open-drain interface is suggested as a more robust way to transmit the PIR signal over distance. Later, the use case is clarified as connecting a 3.3 V sensor to an Olimex ESP32-POE-ISO-EA board over 30–50 m of Ethernet cable, with PoE and additional ESP32/Raspberry Pi Zero 2 W management, but the final advice remains only a brief “connect like this” without further detail.
AI summary based on the discussion. May contain errors.