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Let's say I'm running iOS 6.0.1 on an iPhone 4 and I want to get the temperature of the A4, are there any public APIs that will allow this? If not, can it be done on a jailbroken iPhone? I ride my motorcycle to work, and when it is below 30 degrees F the phone gets cold enough that the chemical reaction in the battery slows to the point that the phone shuts down. I would like to write an iPhone App (Shiver) that ramps up the GPU and CPU usage when the CPU cools to below a certain threshold (if the CPU is at 60 degrees F, it would be safe to assume that the battery is probably at 50 or less and quickly approaching the point at which it quits putting out enough power even though it has plenty of charge left). You'd turn on such an app when you are about to ride 20 miles or more in the cold, or ride your snow mobile for 20 miles or so. The app would run your battery down a lot faster, but 2 hours of functioning phone would be better than 25 minutes and then dead until you can warm it back up. If I had access to the temperature of the CPU I could ramp up the CPU usage only as much as necessary and only when necessary. The extra draw of voltage from the battery would also heat the battery directly in addition to heating it indirectly from the heat radiating off the CPU and GPU. Other question, is how much are background processes in iOS allowed to tax the CPU and can they make the GPU work hard with the screen locked and off?

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It sounds like a nice project to learn to program, but I place my phone in contact with my body so that it never cools enough to substantially raise the internal resistance of the lithium battery. With the internal device temperature at -18 C (0 F) you should be seeing a 50% reduction in capacity - even with the device sleeping and no CPU to keep things warm. – bmike♦ Nov 29 '12 at 18:17
Questions about programming, development, and listing your apps on the App Store are off topic for Ask Different. – Daniel Lawson♦ Nov 29 '12 at 19:14
If you're really just interested in getting the CPU temperature, that could be an end-user question, but your question text seems to suggest you're looking for an API to do this programmatically, which puts the question outside the scope of this site. – Daniel Lawson♦ Nov 29 '12 at 19:15

closed as off topic by Daniel Lawson♦ Nov 29 '12 at 19:14

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1 Answer

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You can use iStat (iTunes: https://itunes.apple.com/app/istat-sys-monitoring-battery/id303034517?mt=8), but it costs .99$, but it should show you the processor temperature

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iStat lets your iOS device view temperatures on your Windows, OS X or Linux machine. It does not let you view the temperature on the iOS device running iStat – Robert Louis Murphy Nov 29 '12 at 19:40
Oh, sorry, didn't know that (this 1 was the only 1 that looked promising from a google search) – JomanJi Nov 30 '12 at 15:53

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