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Light Sensor Example: XBee Zigbee Cloud Kit

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xbee-wifi-light-dashboard-widget

Table of Contents

  1. Introduction
  2. Assemble the Parts
  3. Configure the Radio
  4. Wire up the Circuit
  5. View it!
  6. Use it!

1) Introduction

In this example you will learn to use a photocell light sensor with the XBee Zigbee Gateway to sense and take action based on the amount of available light. You use light to tell if it’s day or night of course, but you can also determine if a cabinet is open or closed, or if someone is currently occupying a hotel room. Because light changes at the speed…well of light, it’s a great sensor to use when want to prototype using changes that happen instantaneously rather than only over a longer period of time. Best of all, these sensors are cheap—at about a dollar a piece, they’re a great component to use when deploying sensors in large multiples.

The resistance across the two leads of the cell varies according to the amount of light hitting the cell. With our circuit, the brighter it is, the lower the voltage that is passed to the XBee’s analog-to-digital converter (ADC). This reading is then sent via Device Cloud to the XBee Zigbee Cloud Kit’s online dashboard application. Now you can monitor the brightness from anywhere right in your web browser.

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Temperature Example: XBee Zigbee Cloud Kit

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temperature-widget

Table of Contents

  1. Introduction
  2. Assemble the Parts
  3. Configure the Radio
  4. Wire up the Circuit
  5. View it!
  6. Use it!

1) Introduction

Measuring temperature is a popular way to get started with analog sensing. This example uses the TMP36 low-voltage linear temperature sensor that is included in the XBee Zigbee Cloud Kit. The TMP36 is very easy to set up. It doesn’t require any complicated circuits or tricky calculations to determine if it’s hot or not.

The sensor generates a voltage output output that is directly proportional to the Celsius temperature. The hotter it is, the higher the voltage that is passed to the XBee’s analog-to-digital converter (ADC). This reading is then sent via Device Cloud to the XBee Zigbee Cloud Kit’s online dashboard application where you can monitor the temperature right in your web browser.

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Wireless Text-to-Speech Device

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Would you like to be able to type ANY word, phrase, sentence, or paragraph and have it speak wirelessly from a speaker? Well it’s now a reality. This project allows you to type into a serial terminal connected to an XBee, and when you press enter, the words are sent to another XBee enabled text-to-speech module that speaks the words out loud on a connected speaker.

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Figure 1. XBee Serial Connection
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Figure 2. Text-to-Speech Module

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Wireless Bar Graph Brightness Display

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Would you like an LED bar graph to wirelessly show you how bright or dim a room is elsewhere? Well this is just the solution for you! This project uses an MBed microcontroller, light sensor, LED bar graph, and a pair of XBee radios to get you going on monitoring brightness without even being there.

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Standard Lighting
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Dim Lighting
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Dark

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Wireless Disco Ball Controller

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Are you having a party? Would you like to be able to wirelessly control your disco ball’s revolution speed from afar? Then your solution is here! This project uses a set of XBees and an Arduino to control a disco ball’s lighting as well as how fast it revolves.

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Potentiometer Knob
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0%
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35% (light glows on)
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70% (slow spin)
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100% (fast spin)

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Device Cloud GPS

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Do you want to be able to access GPS coordinates of anything, flying or not? Well, you can do just that by wirelessly sending that data to be seen from a computer on Device Cloud. This will use the Arduino microcontroller and XBee radio. After all, Arduino and XBee are best friends in the electrical engineering world! Why else would an XBee shield exist?

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Wireless Scoreboard

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Would you like to be able to keep tally of a score on a portable LCD screen with wireless pushbuttons? Then this is the project for you! This project uses an Arduino microcontroller, Mbed microcontroller, and a couple of Digi XBee radios.

score1
Initially 0-0
score2
Push Home button
score3
Now 1-0
score4
Push Home 10 more times & Away 3 times
score5
Now 11-3
score6
Push Reset button
score7
Back to 0-0

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XBee Rock, Paper, Scissors

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Would you like to be able to play automated Rock, Paper, Scissors electronically and wirelessly? Then this is the project for you! This project uses two Mbed microcontroller and a couple of Digi XBee radios to enable two people to choose a button representing either Rock, Paper, or Scissors and determines the winner on your own LCD screen.

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