practical devices

Develpment board ----- Arduino Mega 2560 ------------- price ~50$
uart camera module ----- µCAM529-TTL ------------- price ~4500Rs
uart gprs module --------- SIm300 Module ---------- price ~3000Rs
uart gps module --------- EM-408 GPS module -------- price ~4000Rs

hawk board ----~80$
moxa usb-4uart ---250$
and others