The user flashes a QR Code (or accesses a website) to ring a door bell in a remote location.++++++Operation Principle:When the user accesses the website, an ajax call is performed which changes the contents of a .txt file to "on". The Raspberry Pi checks this file every second. If it detects a chang...By: gcoolinfo
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from Instructables: exploring - technology - robots http://ift.tt/1vXhYUT
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