Hey, I’m originally from a programmers perspective so if any of you electro-wizards could help me out I would be grateful.
My current setup is pretty basic with an mfrc522 and a sd card reader sharing sck, miso and mosi with mfrc522 using the SS pin (10) and the sd card reader using pin 9.
For reasons that are magic to me this works when i try either component alone, but when i do them together things start acting weird.
I am able to read from sd and then the mfrc522, but if i try to read from the sd card again it wont connect. If i restart the Arduino the problem remains, and I am still unable to connect to the sd reader. I have to physically remove power from the sd reader to “reset” it.
To me a line is either powered or not (digital yay!) but it appears that isn’t always the case(?). I’ve tried to read up on these things but honestly its all new territory to me and terribly slow. I think this could be solved with a pull up/down resistor or two somewhere, but why and where i have no clue.
If any of you guys have a solution and/or some pointers to where i could learn this powerful magic that would be really cool.