In the last three posts I went through the basic steps to send data from an Android device to an Arduino using a bluetooth serial module. That was fun and all but it would be better if the Arduino could send data back to the Android device. With functionality like that there a lot more plausible uses for the technology. For this example I am going to go through the steps to make a 4 channel voltage logger but with a few minor changes this could be used to send/receive practically anything.
All files used are available on GitHub here.
Like last time, lets get the Arduino stuff out of the way first. For this project I have made a simple sketch and circuit that takes four analog inputs A0-A3 and then converts the values to 2dp float voltage values. The values are then displayed on the LCD screen…
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