I need to connect two Arduino cards together with networking one of them will be sender and the other card will be receiver i need the receiver card receive analog signal normal open and normal close and the sender will be input and the receiver will be output the sender will send network
i hope you answer me as soon as possible .
Sounds doable ....
If you buy the network shields there should be libraries for them which will have example programs to get you started .
Google the shield type to check out Availability of libraries first
from where should I buy network shields ?
What libraries do you mean ?
You could use esp8266 in combination of arduino. but a better way is to use the nodemcu, because you can program it like Arduino using the Arduino ide, its like a wifi enabled arduino in one board
OP has not mentioned nodemcu !
They have two ARDUINO CARDS !