This tutorial, serves as a sequel to the Simple & cheap, GSM controlled on/off switch, was originally published in my blog and describes one of its applications. Now, we will modify the inexpensive GSM bug and whenever we call the GSM bug, a buzzer will emit a distinctive monotonic sound that will h...By: Dimitris Platis
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from Instructables: exploring - technology - robots http://ift.tt/1C4HP1I
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