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Does a a device, say an iphone, require more energy to advertise as a BLE peripheral in the background than it would if it were scanning as a BLE central in the background? If so then by how much? Again I am refering to a small device such as an iphone.
Core bluetooth is optimized for minimal power consumption. There is practically no difference between the central and peripheral roles. Don't worry about the power consumption of ble operations, the Apple engineers have taken care of that for us. You should be more concerned with writing your critical business logic to run efficiently.
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I’m trying to build a development board like raspberry pi, I can’t seem to find a processor that is sold as a standalone.
For example arm cortex A etc
Please where can I find modern multi core processors to use for my board
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Firmware - What exactly is this? I know that it isn't a piece of code which just helps in communicating with the hardware since it is the device driver's function.
I guess it is something more complex than that. All the time I see firmware updates for my mp3 players and smartphone. In smartphones I see that after a firmware update the OS's version is bumped up e.g., from Ice Cream Sandwich it goes to Jelly Bean (Android). Does this mean that firmware is an alias to OS?
Firmware is just software that is programmed into a device. In the example you used, the OS would qualify being called firmware. In other devices, it could be less sophisticated than iOS or Android, for example, a lot of DVD players and Blueray players have a firmware component, so do smart TV that are Internet enabled and routers, for instance.
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I need to learn the basic knowledge of OS, kernel and CPU architectures since some jobs do require those background.
Is there a good book or online resource that I can refer to.
I don't know if you had a specific OS in mind, but one of the best books on how the Windows operating system works "under the hood" is called Windows Internals. It describes in detail how everything from the kernel, to device drivers, and the file system all work.
If your looking for a good book on how CPUs and processors work, in general, I recommend Computer Architecture: A Quantitative approach. Very good info there!
Also, some good resources on how CPUs work, with perspective to programmers, can be found from the Intel technical library. Everything is free to download there and it makes for some good reading!
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There are lots of tools to see your CPU etc temperature, but I'm looking for a tool to monitor your room temperature.
I don't know if my PC have the hardware to do this, but maybe it's build in?
Thanks
Here is a link to a room temperatur scan software. All you need is a probe and a usb device.
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Closed 8 years ago.
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We're considering doing some experimentation with the price point on our iPhone app and I just want to make sure that if we raise the price we won't get a flood of user complaints that apple is charging them the price difference to upgrade.
No, the don't pay the upgrade. In fact, it is an interesting way to launch your app: a small price at the beginning, as a special promotion, and then increase it if you made significant improvements.
Google "iphone app pricing strategies" for info on how other apps did in the store.
No, that's a way to encourage your potential users to buy it ASAP.