Week 6 - Testing GSM Sim 900a.

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         This week is the testing of the final component which is the GSM Sim 900a. Sim 900a is built with Dual Band GSM/GPRS based SIM900A modem from SIMCOM. It works on frequencies 900/ 1800 MHz. Sim 900a can search these two bands automatically. The frequency bands can also be set by AT Commands. The baud rate is configurable from 1200-115200 through AT command. The GSM/GPRS Modem is having internal TCP/IP stack to enable you to connect with the internet via GPRS. Sim 900a is an ultra compact and reliable wireless module. This is a complete GSM/GPRS module in a SMT type and designed with a very powerful single-chip processor integrating AMR926EJ-S core, allowing user to benefit from small dimensions and cost-effective solutions.

            To test the Sim 900a, first, need to insert a sim card into the sim card slot provided. Then, power up the Sim 900a using a 5v power supply. When the Sim 900a is turned on, we need to wait about 1 minute for the Sim 900a to establish a connection with the mobile network. There will be a blinking light labeled D6 on the Sim 900a. The blinking light is the status LED which shows if the connection is established. Once the connection is successfully established, the blinking status LED will continuously blink every 3 seconds. Then I tried calling the mobile number of the sim card inside the GSM module. After hearing a ring back, that indicates that the gsm module has successfully established network connection. 

            Then, I connected the GSM's 5VT pin to the Arduino Uno's D9 pin and the GSM's 5VR pin to the Arduino Uno's D10 pin for serial communication between Arduino and Sim 900a module. After that, I uploaded a sample source code using Arduino IDE to test the GSM module. 






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