Can you provide the list of pins that you’re currently using and their function.
When you want to debug your stuff using Serial (and I’m sure you will have a need for that when starting with the ethernet), you can’t use pins 0 and 1 for anything.
You are aware that you can use analog pinsfor digital as well?
And if you’re really low on pins, consider a bigger board like a Mega. Or add port expanders or shift registers; MCP23S17 comes to mind (also using SPI so will cost you only one additional pin).
i was sure i could use the analog pins but needed to google ti to see if i had to do anything special.
so, i can use pin 0 and 1 if i’m not using serial?
My rfid cards are using pins:
5 (for rfid reset pin, i may have a conflict here)and(sd card on ethernet sheld)
6 (SS pin for 2nd rfid card reader)
7 (reset pin for 2nd card reader)
9 (my code says this is the reset pin, but im not using it, so i’m confused)
10(ss pin for card reader 1, I will need to change this to use the shield) and (SS pin for ethernet shield)
11(card reader)and(ethernet shield)
12(card reader)and(ethernet shield)
13(card reader)and(ethernet shield)
2(signal from gate sensors)