SIM900 GPRS/GSM Shield Development Board Quad-Band Module for arduino Compatible with UNO MEGA 2560 850/900/1800/1900 MHz

hello viewers we have here our are doing a you know module seem 900 GPRS shield this is GSM module and 5 volt power supply we have to make sure that this supply this power supply can provide 1 ampere during the startup our Doudna module will take power supply from usb so we have to make sure this both ground are common here this is the Arduino ground and this is our sim 900 ground will make it come on and this is our serial software serial interface of Arduino pin 7 & 8 we make it a serial and here is also the pin 7 & 8 uses the software serial to power it on just need to press this button for two seconds so that it currently is now power on the network light is blinking it means it's connected with GSM network we will use a T command to control this seem 900 module if Network strength is low device will not on it will power off after 4-5 second so you have to make sure you have enough