I'm making up my project, I have an Ethernet shield with an sd card, a light dependent resistor, an rtc ds3231 and an RFID reader (a sm 130 Mifare in a evaluatin board), everything works separately but as soon I put everything together the RFID dont turn on the seeking light, i use the same code and i unplug everything but the RFID and works... it seems like a power issue,im going to connect to an external sours to see what happen.
Any advice?
Any with similar problems?
my best regards
Peter
Any advice?
Post a wiring diagram and the specifications of the power source (voltage, current) and the power requirements of all the parts.