If the WiFi shield is too expensive you might want to look into Bluetooth. This example is for Arduino phones but it shouldn't be too hard to port to IOS.http://www.instructables.com/id/Andruino-A-Simple-2-Way-Bluetooth-based-Android-C/The HC-05 Bluetooth boards seem to run about $7 on eBay.
the android device will serve as :1- output device to the monitor which will output raw data to more clearer graphs and information in the lcd (i need some tutorials about making hdmi output works on the arduino tft lcd screen)2- works as wifi/bluetooth shield with ad hoc feature3- web server
thank you for your replies first of all i am confused because i don't know how to find the correct wayabout the TFT, the android device has hdmi output only, and i have arduino tft shield so i thought it may be possible to implement the tft shield as output for the android device however the hdmi is the issue about the wifi shield i am thinking of connecting the android device to the arduino through usb connection as two ways connectionand then the wifi in the android device will connect as application to the iphone through wireless connection (web server and json parsing)i didn't do it before and it is totally new to me but i think it is the best wayfor the next question it is android 4.0 mini pc
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