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ested in the attribute _total, which displays the number of active streams. If the
number is larger than zero, at least one stream is active. This attribute is now
automatically parsed by the ThingSpeak-page (analysed) and output as a better-
structured value. This value can be called and assessed easily in the program by
the function getThingSpeakHttp().
5.3 | Twitter alarm system
This project is an alarm system with which you can, for example, check whether
someone opens a drawer without permission. There is a continuous check for
whether the connected light sensor is exposed to a specified brightness. If this is
the case, an alarm signal will sound and a message will be sent via Twitter. The
setup is shown in the figure below. Alternatively,
you can also use a temperature sensor and moni-
tor for whether a specific temperature is ex-
ceeded.
Light sensor at A0, piezo at D8
The program
This subject includes, among others, the Twitter App of the ThingSpeak page.
Required parts
1 x pinboard, 1 x NanoESP, 1 x photo transistor, 1 x re-
sistor 10 kOhm (brown-black-orange), 1 x Piezo, circuit
wire