Hello everyone.
I have a project to make where I have to read tags out of 5 RFID Readers and when every tag is in correct reader to open a relay. My code works just fine when powering arduino through my Laptop's USB port but since it have to be installed somewhere I tried the following ways to power it:
USB coming from a Xiaomi 5v Phone Charger to Arduino's USB port
USB coming from this to Arduino's USB Port. It is being powered from a 12v 1amp power supply from and old router.
The 12v 1amp power supply from and old router.
4)L7805CV and it's suggested circuit from the datasheet
My problem is that none of these ways seem to work properly. What I mean is that I cant get readings from the Readers as it should do. I have an LED which lights up when it read a tag but at these cases it only lights up only on some of the readers. The strange part is that when I am charging my laptop and powering arduino through its usb port it doesnt work either.
3Dgeo:
No schematic, no nothing, what you expect to get as an answer?
You are right sorry. The schmatic is this one. I havent made my own cause its the same thing. I also have made the board that i have attached so I can connect all the common pins together (MISO, MOSI, SCK, RESET, 3.3V and GND)
The SDA SS pins are connected directly to pins 3-7 of Arduino.
With limited info you've provided I can only guess – unreliable connections, electrical interference, not stable enough power supply, too fast communication...
Also in your circuit example RC522 is powered by 3.3V, but logic is 5V, that might be a problem too (can't be bother to look at it's datasheet)
3Dgeo:
With limited info you've provided I can only guess – unreliable connections, electrical interference, not stable enough power supply, too fast communication...
What info do you want? I don't have problem sharing it.
The module I am using and the chip works with 3.3v so this isn't the problem for sure
