Hi guys i am building a security alarm system with ESP32 and HT12E/HT12D ICs and I need to detect when VT (valid transmission) pin on decoder goes LOW. It outputs GND current as i have tested with led. Can i connect this directly to esp32 digital pin or do i have to convert to signal through transistor?
According to the datasheet https://www.farnell.com/datasheets/57850.pdf
Provided you power with 3.3v (same as the ESP32) I think you will be able to read the pins directly without a problem.
even though they're gnd?
Sure why not... ?
Set your ESP pin to INPUT_PULLUP, then detect when it goes LOW.
ok thanks!
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