The PIR sensor stayed as HIGH as soon as I uploaded the code into the arduino board. May I ask is there something wrong with my code? The circuit diagram looks like this: [image] Here is the code: int LED = 13; // the pin that the LED is atteched to int PIR = 2; // the …

Hi, @gwynethchiew Can you post a link to the PIR please? Is its output open collector? If so then change. pinMode(PIR, INPUT); // initialize sensor as an input To; pinMode(PIR, INPUT_PULLUP); // initialize sensor as an input It will turn on the internal pull up resistor in the UNO so a …

PIR sensor reads HIGH even with no motion

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killzone_kid September 15, 2021, 7:54am 4

The connection to the sensor looks incorrect for HC-SR501, but who knows which one you are using

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PIR sensor reads HIGH even with no motion

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