Door sensor connect to GPIO

[runy]

Hi mates,

I would like to connect a sensor door like this (https://es.aliexpress.com/item/32255861 ... 63c0iBdn8C) to my raspberry's GPIO.

Using SYSFS option I set the port with the following steps:

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sudo echo 18 > /sys/class/gpio/export
sudo echo in > /sys/class/gpio/gpio18/direction
sudo echo 1 > /sys/class/gpio/gpio18/active_low

but when I try to check the status with

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cat /sys/class/gpio/gpio18/value

the value is always 0

What am i forgetting?

[runy]

I have changed the GPIO for the GPIO4 a now it's working well.