Transmit a char data from one arduino to another arduino using WiFi Shield
You need: 2 Ardiunos (MEGA) 2 WiFi Shields
Instruction: Just upload server file in one ardiuno and client file to another ardiuno. Connect wifi shields. Change the WiFi name and passwords in code. Run ardiunos.Find IP address of server ardiuno. Change IP address in client ardiuno. If green light blinks means wifi shield succussfully connected. if red then recheck. if you assigned n=40. Then f='z'. So client will recieve z as data.