SIM900 on arduino orf similar

Hi.

I need to define one fairly simple system where a gsm call or SMS message should be send according to the analog value on the Arduino or some similar board....

1.) reader is outputting constantly some value from 1 - 20 V

2.) arduino reads this values and if the value is too high it should trigger some event that would activate SMS or call over SIM900

3.) user gets SMS / call

Based on this tutorial, there should be any problem with this setup. The only thing that i need to do is to read the analog values and compare them to some predefined value.

GM.