I have made an Arduino based night lamp using photo resistor and problem with that is light levels was different from place to place, when I am testing I have used a value as a threshold to switch on the light and after fixing it in its final position that value is way off.
So, to get the correct value I have to data log the photo resistor reading after fixing the light in place, which was a bit harder, because I cannot leave my laptop outside for data logging for a whole day. So I need a portable solution to my problem.
Another project was, water supply near my place was limited, we get water only at fixed timings. so I made a device to turn on water motor at a fixed timings of day. I haven’t made any user interface for that device to change timings because timings get to change very infrequently. So I need a way to change timings without connecting laptop and recompiling Arduino code, that would be complicated for my parents.
So I decided to make an android app that would send serial data to Arduino to change timings of water motor.
Serial Port Communication Program
In this instructable, I will explain how to create an android app that can communicate with Arduino by USB OTG cable, If you dont care about how to just download .apk file and install it in your phone to communicate with arduino.
Arduino Android USB Serial Communication With OTG Cable: I have made an Arduino based night lamp using photo resistor and problem with that is light levels was different from place to place, when I am testing I have used a value as a threshold to switch on the light and after fixing it in its final posi.
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