Wireless Connectivity Options for IoT. By: MIST Makers John Varela and Nicholas Landy
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1 Wireless Connectivity Options for IoT By: MIST Makers John Varela and Nicholas Landy
2 Outline Introduction to the Internet of Things (IoT) Wireless Communication in IoT Current Standards IEEE (Wi- Fi) IEEE (Zigbee, 6LoWPAN) Bluetooth Comparison Example Projects A B C
3 Introduction to the Internet of Things (IoT) A network of embedded devices that can be connected to each other and/or the internet IoT systems can be used to Share sensor data between devices Store data on cloud databases Display real- time device information on the internet and in mobile apps Control devices remotely Program devices to respond to wireless signals and triggers IoT will redefine the current state of technology It's estimated that by 2020, there will be 50 billion devices (things) on the IoT network IoT is expected to be as important as the advent of the World Wide Web
4 Some IoT Products Nest Thermostat Smart thermostat. Learns preferred temperature levels and let's you change temperature on your phone. Fitbit Wearable device that monitors fitness activity like calories burned and distance walked and sends info to the cloud to view online or on your phone. Apple HomeKit Hub software framework that let's you control and monitor multiple home IoT devices in a single app.
5 Communication in IoT One vital decision when making an IoT device is the communication protocol you use to transfer information to and from the network This presentation will compare three popular technologies: Wi- Fi, Bluetooth, and IEEE (e.g. Zigbee) Other possible technologies include Z- Wave, 6LoWPAN, and Ethernet
6 Communication Standards IEEE (Wi- Fi) IEEE (Zigbee, 6LoWPAN) Bluetooth
7 IEEE (Wi- Fi) Popular Wireless Communication Protocol Networks are composed of routers and stations Can serve as an internet gateway for other connected devices Features: High data throughput ( Mbps) Medium Range (~100 m) Star Topology LAN ~32 Maximum Nodes Highest Interoperability (many devices are Wi- Fi compatible) Issues: Very High Power Consumption Poor Security (SSID only, no data encryption) High startup connection time (~3 seconds)
8 IEEE Characterized by its mesh network topology. Networks are composed of coordinators, routers, and end device nodes. Common Technologies are: ZigBee and 6LoWPAN Optimal for applications that depend on: Low data rates Mesh applications such as auto- routing between nodes. Low power applications Generally the distance between nodes is limited to about meters, but the range can be significantly increased up to a few miles by making hardware modifications. Requires a gateway for Internet connectivity. Has very low interoperability, even in devices of the same family.
9 Bluetooth Wireless technology specializing in transmitting data over short distances (~10 m). Intended for portable equipment like headsets and other wearable devices. Can build PANs in both star and P- 2- P topologies Features: Fairly low power Good data throughput (1-2 Mbps) High interoperability with smartphone, tablet, and laptop devices Like IEEE , an internet gateway is required to connect to the internet Only 7 nodes can be supported by a Bluetooth master device Bluetooth profiles characterize how different types of Bluetooth devices communicate, which can improve interoperability and transmission speeds Bluetooth LE is also available for lower power applications. Has lower data throughput (~20 kbps) but higher number of nodes (10-20)
10 Important Considerations for Protocols When selecting a protocol for your project, you need to consider some of its properties: Range: The maximum distance for transferring data Data Throughput: The speed at which data is transferred (in Kbps or Mbps). Power Consumption: How much power is necessary for a device using this protocol? Frequency Band: Range of frequencies in which radio signals are transferred. Certain frequencies have more traffic or noise than others. Security: How is information in the network protected from theft or damage? Maximum Nodes: Maximum amount of devices (nodes) capable of running on a single network Cost: Some protocols require more expensive hardware to implement
11 Considerations cont. Network Topology: Organization of nodes (devices) in a connected network Star networks are the most common topology. A single node transfers and receives information form all other nodes. Commonly used in Wi- Fi and Bluetooth Tree networks are used to link different star networks. Mesh networks take away dependence on a central node for communication between any two nodes. Commonly implemented by ZigBee, Z- Wave, and 6LoWPAN
12 Figure Obtained from a series of instructional videos from Ember
13 Comparison of Wireless Protocols Wi- Fi Bluetooth Zigbee Standard IEEE IEEE IEEE Range 100 m 10 m 100 m+ Data Throughput Mbps 1-2 Mbps 20, 40, 250 Kbps Battery Life days 1-7 days days Frequency Band 2.4 and 5 GHz 2.4 GHz 868/915 Mhz, 2.4 GHz Security Low (SSID) 64, 128- bit AES 128- bit AES Maximum Nodes ~ Cost High Low Low Topology Star Star Mesh Network Type WLAN WPAN WPAN
14 Hardware/Software variations *These figures pertain specifically to ZigBee, but still apply to other technologies.
15 Hardware/Software cont. Example SOC(System On Chip) solutions TI's CC26xx family of low- power MCU's (Multi- standard) ATmega64/128/256 RFR2 Low- power MCU's with IEEE transceiver. Silicon Labs' EM35x MPU's (ZigBee) Intel Edison (Built- in Bluetooth LE) RFD22301 Example Network Co- processors ESP8266 (Wi- Fi) EMW3165 (WI- Fi) XBee family of devices KEDSUM Bluetooth serial transceivers
16 Hardware/Software variations The microcontroller + Transceiver option was how RF technologies were first implemented but are not as popular anymore. SOC Microcontroller is part of IC Requires least amount of hardware. Lowes price. Highest power efficiency due to hardware optimizations with Stack. Requires more software development to implement the stack. Network Co- Processor These reduce the software developing time by allowing any MCU/MPU to access the stack features of the Co- processor through serial communication.
17 Gateways Most wireless technologies, such as Bluetooth and ZigBee, allow you to only communicate through that standard. In order to have an IoT project, your network must be adapted to also have internet connectivity. The solution is to have at least one device that has internet connectivity, through Wi- Fi or Ethernet, connected to your RF network Go to this link for a more in depth description of a Gateway and an example project of having a Raspberry pi as a gateway for an Arduino. These are all off- the shelve parts but all of the tools and concepts used, apply to custom made solutions. Pay attention to the API used!! prototyping- a- sensor- node- and- iot- gateway- with- arduino- and- raspberry- pi- part- 1/ configuring- a- sensor- node- and- iot- gateway- to- collect- and- visualize- data- part- 2/
18 Sample Projects
19 Sample projects To summarize the following slides: SOC solutions are advised if you are implementing your IoT connectivity in your board and need a customized design. This will require regular MCU/MPU tools, such as debugger and IDE, as well as the required Stack provided by the manufacturers of the specific SOC. Network Co- processors are advised if you want to avoid the software development of the stack, and instead want IoT connectivity by just using serial commands from any MCU/MPU of your choosing. Most options are available in off- the shelve devices, but companies like Atmel and TI also sell these IC s SBC are ideal to use as your gateway to connect your nodes to the internet
20 SOC implementation Aside from a few development boards, SOC solutions are the way to go if you are designing your own microcontroller board or need a small footprint. If you are familiar with ATmega 8- bit MCU s, I recommend you to use the ATmega256RF2R. 32- bit ARM Cortex- M0 versions are also available. You will need additional components to use the IEEE functionalities, such as an antenna, proper filtering circuit, and required oscillators for the built- in transceiver. Check the datasheet to find out the required components!!! I suggest creating an account on Circuithub and searching for pinoccio. Look at the Altium or Eagle design files for referece. In the software side, you must download an IDE for debugging along with the drivers and stack provided by the SOC manufacturer.
21 Using SBC(single board computers) SBC's give you the power to very quickly connect your project to the internet by using the power of a full OS such as Linux. The following links and tutorials can be easily implemented in the Raspberry pi, Beagle Bone Black, and Intel Edison, while running on a Linux image. SBC s are great to use as gateways to connect between your RF network and the internet. for most of these systems, you will need a RF USB dongle (Bluetooth or ZigBee) and either a Wi- Fi dongle or Ethernet connection for internet connectivity. Most project tutorials provide you with a custom image, this explains how to install them. cards- and- writing- images Sample tutorial of blinking an LED with a Raspberry Pi depending if a keyword appears on a tweet. pi- twitter- monitor Camera monitoring system that sends s based on the different Bluetooth devices in range. Monitoring- and- Tracking- System- Using- Intel/?ALLSTEPS
22 Projects using cloud ecosystems IBM Bluemix cloud ecosystem provide developers with "recipes", tutorials on how to connect popular devices such as Arduino, Raspberry pi, ESP8266, TI sensor tag, etc. Sparkfun's cloud ecosystem allows users to push and access data online. data- to- datasparkfuncom
23 Additional Resources TI s wireless connectivity solutions Adafruit s IoT resources IoT software resources and list of API s of- things- software- guide Zigbee intructional videos by Ember. (Great for learning about the Stack)
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