By Alasdair Allan
Construct your individual disbursed sensor community to gather, research, and visualize real-time info approximately our human setting - together with noise point, temperature, and other people move. With this hands-on publication, you will the way to flip your venture proposal 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 total technique, from prototyping an easy sensor node to acting real-time research on info captured by way of a deployed multi-sensor community.
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Extra info for Distributed Network Data: From hardware to data to visualization
Electret Microphone We’re going to use the electret microphone breakout board from Adafruit Industries (see Figure 4-1). The board comes with a capsule microphone and supporting hardware including, an op-amp and a potentiometer to allow you to adjust the gain. Electret microphones are small, omnidirectional microphones commonly used in cell phones and laptops. They can have an extremely wide frequency response; the one we’re using has a 20Hz to 20kHz frequency response. They are small, very cheap to produce, and quite sensitive.
In digital circuits, a logic level is one of a finite number of states a signal can have. They are usually represented by voltage levels in the circuit. In our case; +5V represents a HIGH logic level, and 0V (GND) represents a LOW logic level. By extension, these represent the digital 1 and 0, or on and off. When our sensor is active, it will override the high logic level set by the pull-up resistor. The pull-up resistor ensures that the wire is at a defined logic level even if the sensor connected to it isn’t active.
See Chapter 5 for more information about how to solder if you haven’t done any soldering before. Connect the red trailing lead to the +ve (+5V) rail using a jumper wire, and the black trailing lead to the −ve (GND) rail using another jumper wire. Finally, connect the middle (yellow) wire that carries the data signal to PIN 3 of your Arduino with another jumper wire. info | 29 If you’ve followed the instructions and wired the breadboard as laid out in Figure 3-2, you should have something that looks a lot like Figure 3-3.
Distributed Network Data: From hardware to data to visualization by Alasdair Allan