Hello , i want to trigger one sos button of a GPS tracker after X time if the user don’t cancel the code via RFID card .
My main code is the same as the AccessControl example of MFRC522 library with changes at the relay state (stay LOW at Granted delete delays,HIGH state everywhere ) and a change on pins (swap 4 to 7 ) .
How i can turn on the relay after X time ? (the better way)
3.Read state of pin
I have see the 3 options and try to use them in my code with no luck . i need help to understanding the process The delay make the code waiting ok is out , can enyone help me to understand the to others ?
Its more easy if i use a button as input trigger "if button pressed–> do this "?
The same task its easy to make it with ic 555 or to trigger the ic from arduino , i struggle to use only arduino (i know isnt hard but i have stuck with my tries and research )
AccessControlmodif.ino (24.2 KB)