Is it possible to get iPhone's Temperature/Humidity/Pressure/Battery_Voltage/Acceleration_Values using API calls?
I want to make an app that displays these values from iPhone internal sensors. Is it possible?
For accelerometer, yes:
For battery, you can get the battery level and battery state (on charge…)
Other battery info are private API
Go and search on Google with "get iphone battery voltage programmatically"
For ambient temperature and humidity, I guess the best would be to access some web site to get those info in real time. Don't think they are accessible with API.