The wearable device will occupy a considerable share in the field of the Internet of Things. Based on sensors and wearable devices connected in wirelessly, they are turning from the fantasy products of the sci-fusion drama "Star Trek" to the market. Fitness wristbands and networked glasses (eg, Google glasses). How can I be rapidly accepted? Wearable devices require a considerable battery life, sufficient privacy protection capabilities and low enough costs.
Let the wearable technology become a fashion popularity by a hot goods, and the money is not a problem. Based on the data provided by IDtechex, Microsoft, Google, Cisco, Apple and Oracle have a total of $ 245 billion in cash, which has a strong interest in wearable technology, Internet of Things (IoT), and Tibet (IOP). Announcement for the establishment of an investment fund often occupies the headlines of major media, including Salesforce Ventures for a special investment of $ 100 million for new mobile applications and networked products.
Intel and Fossil have recently declared co-declarations in wearable technology, and it is also a context that this trend comes. During the recent Intel Developer Forum held in Intel, Brian Krzanich, the company's CEO, pointed out that by launching other Internet of Things platforms and systems, Intel will continue to walk along the road to wear this road. For example, the company's EDISON platform is a microcomputer that uses a 22 NM chip with Wi-Fi and Bluetooth features, and can be designed in part of the next generation of wearable devices. Various plans include higher availability and stronger fashionability, while the latter is the key to the public recognition.
Although the wearable concept is not a new thing, it has so far, its functional application is still more in the industrial field, and only a few people use the MicroOptical tool to display maintenance instructions, indicating that the part fault. Google glasses have been used to fixed asset maintenance and fitness, medical fields.
All of these applications rely on the most basic sensors, which realizes exciting functions on new products. For example, like TEXAS INSTRUMENTS 2.4 GHz Bluetooth Low Power Slice System Sensortag Development Kit, STMicRoelectronics's L3GD20 MEMS motion sensor and the company's BluenRG sensor, which is currently used by the sensor product type example, the same There are also Honeywell's magnetoresistive sensor IC. Let us explore the causes.
Bluetooth technology energy efficiency, low power consumption, strong security, and easy to implement. In other words, Bluetooth technology is a natural choice for wearable communications. Texas Instruments's CC2541SENSORTAG development kit is designed to simplify the development of low-power Bluetooth sensor applications. Application developers can use Bluetooth technology to quickly and easily write smartphone applications for low-power Bluetooth accessories without developing other embedded hardware or software. The Sensortag Suite includes (Figure 1) including:
1 CC2541 SENSORTAG with housing
1 CR2032 battery
1 screw (for fixing housing)
Quick Start Guide
The RF circuit board of the kit has passed FCC and IC certification and test, which meets ETSI / R & TTE from 0 ° C to + 35 ° C over temperature requirements and integrates a PCB antenna.
The Sensortag Suite includes the following sensors:
TEXAS INSTRUMENTS IR Temperature Sensors (TMP006)
Sensirion's humidity sensor
EPCOS pressure sensor
Kionix accelerometer
Invensense's gyroscope
Freescale magnetometer (MAG3110)
TI's Sensortag CC2541 (Figure 2) is six sensors, which are high energy, low cost, small surface mount devices. These sensors use I2C interfaces and connected to the same interface bus by independent enable signals. To keep low current consumption, all the default status of all sensors is "disabled" and are in sleep mode during adjacent measurements.
The CC2541 is particularly suitable for systems that require ultra-low power consumption. The device's operating mode conversion time is shorter, and power consumption can be further reduced. Specific applications include 2.4 GHz proprietary and low power Bluetooth systems, human-machine interface equipment, consumer electronics, and mobile phone applications.
When using the wearable device, the focus is to know where you are and where you will go, and the sensors that provide this information must be small, high performance, and reliable. An example of the STMicroelectronics LSM303C electronic compass is shown in Figure 3. The device is claimed to be a global volume of electronic gyroscope, which integrates a 3-axis accelerometer and a 3-axis magnetometer in a single sector.
The chip size is only 2 mm x 2 mm and is reduced by nearly 20% compared to similar devices, which can be used to achieve advanced navigation and motion sensitivity.
The features of the device include:
Tilt compensation compass
Map rotation
Location detection
Exercise activation function
Free fall detection
Click / Double click to identify
Step
Intelligent festival
Save space in motion monitoring wrist straps or smart watches, ST's LSM303C electronic compass saves nearly 1 mm2 printed circuit board space than similar competitive products. Designers can optimize component layout, minimize Wi-Fi, Bluetooth and cellular radio interference. The small size of the LSM303C helps reduce the volume of the wearable device.
Naturally, this is not entirely the sensor itself - also providing a wearable application to provide magic-like enable technology, such as the BluenRG of StMicroelectronics low-power Bluetooth wireless network processor. BLUENRG can be used as a master or slave device in applications such as watch, fitness equipment, health and sports, as well as consumer medical and life auxiliary.
This complete low-power Bluetooth protocol operates on the embedded ARM Cortex-M0 core, while non-volatile flash memory allows for on-site upgrade. It is designed to meet the strict peak current requirements when using standard buttons, only 10 mA when the 1 DBM output power is output. Ultra-low power sleep mode and very short working mode conversion time, ensuring very small average current consumption, which further reaches longer battery life. Bluenrg also provides the use of the SPI transport layer to connect the external microcontroller.
It is possible to meet ultra high sensitivity, low current operation and ultra-small base surface requirements, which is a nanopower series of Honeywell. This series provides two magnetic sensitivity to suit a variety of design requirements, including SM351LT for use in applications that require ultra-high magnetic sensitivity and very low current consumption. In contrast, SM353LT is suitable for applications requiring very high magnetic sensitivity and very low current consumption.
This type of Internet of Things with various types of sensors and wearable applications will continue to expand in real-time event monitoring and results communication. In addition, this fusion will expand as long as the on-site personnel need to access the problem or evaluate current conditions. As these technologies are used more frequently, the cost will be reduced, so that even new applications that are unimaginable today will also be used in a greater amount.
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