Download Distributed Network Data: From hardware to data to by Alasdair Allan PDF

By Alasdair Allan

Construct your individual allotted sensor community to assemble, examine, and visualize real-time information approximately our human atmosphere - together with noise point, temperature, and other people stream. With this hands-on booklet, you will flip your undertaking concept into operating undefined, utilizing the easy-to-learn Arduino microcontroller and off-the-shelf sensors. Authors Alasdair Allan and Kipp Bradford stroll you thru the whole strategy, from prototyping an easy sensor node to appearing real-time research on facts captured via a deployed multi-sensor community.

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Distributed Network Data: From hardware to data to visualization

Construct your individual allotted sensor community to gather, examine, and visualize real-time info approximately our human atmosphere - together with noise point, temperature, and other people circulation. With this hands-on e-book, you will the best way to flip your venture notion into operating undefined, utilizing the easy-to-learn Arduino microcontroller and off-the-shelf sensors.

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Info Figure 2-6. Temperature against time (dotted lines denote gaps in the data) Summary In this chapter we’ve learned how to wire up a breadboard to prototype a circuit, and how use the Arduino to read values from a sensor. info CHAPTER 3 Adding Another Sensor Just as when writing code, taking an iterative approach to building hardware is always advisable: change one thing, test, and then change another. In later chapters, we’ll take the evolutionary approach one more step forward and move our sensors off the bread‐ board, but for now, let’s add another sensor.

Because libraries are uploaded to the board with your sketch, they in‐ crease the amount of space used by the sketch on the board. If a sketch no longer needs a library, simply delete its #include statements from the top of your code. This will stop the Arduino IDE from linking the library with your sketch and decrease the amount of space used on the Arduino board by your sketch. info | 21 The DHT Library We’re going to make use of the DHT library written by Limor Fried. It’s available for download from the Adafruit GitHub repository.

Modifying the Software Reading from the PIR motion sensor is a lot easier than reading from our DHT tem‐ perature and humidity sensor. We won’t need an external library. println( "Motion ended" ); // We only want to print on the output change, not state pirState = LOW; } } motionState = 0; // reset motion state delay(2000); } The pin to which the PIR sensor is connected has been pulled HIGH by the sensor board, and last time through our loop the state was LOW. This means that since the last time we looked, movement has started.

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