Your 2 channel relay seems not having any optical coupler to isolator to reduce/prevent back EMF spikes going back to the Rpi's power supply and thus mess up the python program. Perhaps you should replace it with a relay with the following features: (JD-Vcc jumper, for total optical isolation, (2) Optical couplers.
If i turn on the 12 V first in that case the Raspberry Boots up , the RFID scans for the first time and then stop working for the second time. For this one i had a plan to restart the script each time someone scans the RFID but in that case it says that the GPIO Pins are in use
Discussion between tlfong01 and Ahtis…
Discussion between tlfong01 and Ahtis…