Is there any easy way to upload a program/sketch from an iPad or Android tablet without adding extra an shield (Bluetooth or Wi-Fi)?
If not, can it be done using shield? Which shield is preferred?
Also what are the IDE options available?
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I figured out a way to do this without having to port the compiler to iOS. It only works with the arduino Yún, but the Yún can send code to other arduinos with an spi cable.
kind of confusing, but it could work!
Unfortunately Apple doesn't allow apps that implement programming languages. This being said, it is unclear why they would not allow an app that has to do with the Arduino IDE due to the fact that the code doesn't actually run on the Ipad itself.
See here for more Info.
As far as an Android IDE, I have heard that there are a few people working on different IDEs that sends the code to the Arduino over the internet, although they have not been released yet, and the details are still a bit unclear.
You can always upload to the Arduino via Bluetooth.
For a more detailed description please read: http://ame2.asu.edu/staff/kidane/ArdWilessBtProg.pdf
Since your question is only about uploading, this will work with a Yun
Is there any easy way to upload a program/sketch from an iPad or Android tablet without a shield (Bluetooth or Wi-Fi)?
If you don't mind re-writing your program in an interpreted language, one option is:
(*) There are several different ways to make this link; some of them are mentioned at How do I write an Arduino sketch and an Android application to talk to each other over a standard USB cable? .
i have been trying out arduinodroid - it's an ide that claims you can upload to your arduino from it. you need an OTG cable (on the go) and to be honest i never actually managed to upload from arduinodroid but others seem to be able to...
my arduino is currently not talking to my computer - a bootloader problem it seems - so i'm getting hold of an AVR ISP MKii - with one of them it is apparently possible to send from terminal ide - an android app, will feedback when and if i get it to work.
I have tried android app to programming Arduino Uno via bluetooth, simply by adding Bluino_Shield to your Arduino Uno. This link app https://play.google.com/store/apps/details?id=com.bluino.bluinoloader
Yes, you can upload over BLE with free(mium) iOS app - Apploader