I need advice with SIM900 GMS/GPRS module

Hi Im working on a project and Im looking some advice... In my project I use one arduino uno, one thernistor as temperature sensor, 3 leds us outputs and one sim900 gsm/gprs shield. scenario description:

ok I solve my proplem :)

How can I send the value of a variable in SMS using SIM900 GSM module?

How can I send the value of a variable in SMS using SIM900 GSM module?

Just like you send a string.