Hi Spark Core guys.
You may have already tried MEASURING THE TEMPERATURE example at http://docs.spark.io/examples/ which is great way to know how to use the temperature sensor.
I just created very simple iPhone App which connect the sensor via the Cloud API and blogged the whole process at http://d.hatena.ne.jp/higepon/20140915/1410784693.
You can also download whole source code github.
The iPhone App is written in Swift, so easier to understand than Objective-C
Any questions are welcomed!