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MIT App Inventor and Arduino Part 2 - send data from Arduino to Android and display I found numerous links via Google for this example; unfortunately a lot of them were the same tutorial posted in different places by the same person. None of them included the Arduino sketch! However, the sketch tuned out to be entirely trivial   I won't bother giving any of the links, because the the whole thing is unbelievably simple!   Here is the Design screen for the App:      ...
App Inventor, Bluetooth and Arduino - Part 1   MISSING IMAGES RESTORED 5 FEBRUARY 2016   I was enthused by Pieter Bok’s post  involving an iPhone App connecting to an Arduino via WiFi:   http://www.element14.com/community/videos/12327/l/arduino-based-automatic-irrigation-system-for-pot-plants   I don’t have an iPhone, or a WiFi shield, but Bluetooth was mentioned in the thread,  so I Googled around for Android, Arduino and Bluetooth, finding several ...