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What Is The Best Network For Wireless Sensors?
This question has been asked many times by customers and seen on forums. Unfortunately, there is no single answer. Each network has its own strengths and weaknesses. So the best one depends on the application.
Although there are many network technologies that can be used for wireless sensors, the most popular ones are Wi-Fi, ZigBee and Bluetooth. These networks have similarities in that each can host and manage wireless sensors; Each is designed for short-range wireless communication; And each operates in the open 2.4 GHz radio frequency (RF) range. Beyond these similarities are significant differences. Understanding the key differences between networking technologies makes the choice much easier.
There are three factors that are used as rules of thumb to quickly determine the best network for a given sensor application. These are network bandwidth, power consumption and radio broadcast range. Bandwidth is the maximum data throughput on a network, measured in bits per second. In terms of data flow, faster is usually better. Power consumption refers to how much power is required to operate the sensor electronics and broadcast on a given network. Range is the effective distance that a radio signal travels.
The relationship between these three technological factors is to understand their differences. For example, as network bandwidth increases, so does energy consumption. The same goes for the range. As the radio range increases, so does the power requirement. Therefore, it is necessary to understand the sensor usage requirements, such as how many sensors, how far apart they are, and approximately how much data the network is expected to manage.
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Like all products, each network is designed to solve a specific problem. The main purpose of Wi-Fi was to provide a high-speed wireless replacement for the Ethernet cables used to connect computers in local area networks (LANs). Wi-Fi has a speed of 11 megabits per second while occupying five (5) channels at 2.4 GHz. This makes it well suited for computers and smart devices that transfer large data files such as videos, games, music, images, etc. The effective range of the Wi-Fi device is approximately 32 meters indoors and 70 meters outdoors.
The downside of Wi-Fi is that transmitting 11 megabits over five channels requires a lot of energy. A laptop, tablet or smartphone will only work for two hours if not plugged into an AC outlet. In relative terms, Wi-Fi is a power hog.
ZigBee, on the other hand, was developed specifically for battery-powered wireless sensors. Power saving is an important component of ZigBee with power management features built into the platform. Battery-powered sensors may need to operate for months or even years without needing to recharge or replace the batteries. ZigBee achieved this in several ways. First, sensor data packets are typically 250 bytes or less. This is part of the music files, games and videos viewed on the Wi-Fi network. Second, ZigBee devices can be put to sleep when not in use. This is referred to as Duty Cycling. For example, if a temperature sensor measures once a minute, the sensor will receive a reading and transmit the results in generally less than 100 milliseconds. Then for the remaining 900 milliseconds, the device moves to save power.
ZigBee is an idea for battery-powered wireless sensors where the number of nodes in the network is limited (generally less than 50) and the network data traffic is quite low. Network performance degrades dramatically as network traffic and the number of network devices increase. This is because the ZigBee transmission rate is 250 kbit or about 1/44 of Wi-Fi and uses only one channel. The broadcast range is similar to Wi-Fi, with an outdoor range of about 100 meters.
Bluetooth is a platform developed by Ericsson in 1994 as a Personal Area Network (PAN) for secure wireless communication between personal devices. Given that Ericsson manufactures mobile phones, they needed a high-speed wireless means to connect the wireless headset to the mobile phone. They had two conflicting opinions, the headset was powered by a battery and they needed relatively high bandwidth.
Bluetooth solves this dilemma with two adjustments. First, they set the bandwidth at three megabits per second. This figure is significantly lower than Wi-Fi, but it is perfectly capable of handling audio communication between personal devices. However, three megabits can drain the battery pretty quickly. So the second modification they made was to reduce the radio broadcast range to 10 meters. Broadcasting a signal on 10 meters requires much less energy than 70 meters on other networks.
Bluetooth has emerged as the technology of choice for wireless communication between personal electronic devices such as Nintendo’s Wii, PlayStation 3, wireless mice, keyboards, and printers. The advantage of Bluetooth is relatively high bandwidth and low power consumption. The downside of Bluetooth in a wireless sensor network is that only seven nodes can be connected at the same time, and they must be relatively close to each other.
So which one is the best?
After this brief explanation, it seems that ZigBee has been used in most wireless sensor applications because it was specifically designed for this purpose. More often than not, this is the case. Still, there are plenty of applications where Wi-Fi or Bluetooth are better choices. If the network has computers, smartphones, tablets and sensors that require high bandwidth, then Wi-Fi is generally the best network. If the network consists of wireless, battery-powered sensors, then ZigBee is generally the better choice. If the network connects seven or fewer personal devices, such as headsets, cell phones, Wii controllers, or wireless keyboards to your computer, use Bluetooth. Like any rule of thumb, there are plenty of exceptions, but this is a great place to start.
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