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App Inventor, Bluetooth and Arduino - Part 3 I’ve already done a lot of work controlling Arduino connected devices over Ethernet, including using a slider from Google Visualisations to control the brightness of an LED, and using three sliders to control a Tri-Colour LED. Both of these exercises were fairly nightmarish, involving a lot of javascript, which I didn’t fully understand, along with the HTTP commands GET and PUT, which I also don’t fully understand! (Anyone inte ...