The CC2541 SensorTag is the first Bluetooth Smart Development Kit specifically for wireless sensor applications and the only development kit for smartphone application developers. SensorTag can be used as a reference design and development platform for a variety of smartphone accessories. TI uses the CC2541-based SensorTag to simplify and accelerate the development of Bluetooth low-energy applications. SensorTag centralizes all common sensors on a single board for quick evaluation and demonstration. SensorTag works with TI's TPS62730 (buck converter), including TI's TMP006 IR MEMS temperature sensor, humidity sensor, pressure sensor, accelerometer, gyroscope and magnetometer. The versatility of SensorTag means unlimited application possibilities, including health and fitness, medical, educational tools, toys, remote control, mobile phone accessories, proximity and indoor positioning applications. The CC2541 SensorTag kit reduces the design time for Bluetooth low energy application development from months to hours without the need for embedded software design knowledge. SensorTag is pre-programmed with the FW needed to start developing smartphone apps, and TI offers the SensorTag app in the app store to give developers access to the tools and software examples they need.
SensorTag now supports iBeaconTM technology
SensorTag now supports iBeacon technology, and iBeacon can be used to customize location apps on smartphones or tablets: the location feature is available to many retail stores, museums and restaurants to display relevant information to users. iBeacon technology can be integrated into mobile application accessories, asset trackers, home automation systems, alarm and security systems, point-of-sale devices, automotive, industrial applications, and a wide range of consumer electronics and appliances. For more information on how to use Sensortag with iBeacon, watch the video in the video section below or visit the SensorTag Wiki. Can be used as a power supply interface, but not as a uart port (sensorTag firmware is not a serial program). Even if it is powered, it needs to be welded to add the connector as shown below.
Beginning with Bluetooth 4.0, the Bluetooth Low Energy (BLE) protocol began to gradually replace the ANT protocol, which allows data to be transmitted at a lower rate, while lower power consumption, and battery life has been greatly improved. In particular, from iphone 5 to Android 4.3, the protocol stack including Bluetooth low energy (BLE) has been included, which means that the main smartphones behind will support the low-power Bluetooth standard. More and more customers, including medical devices, mice, keyboards, mobile phone-controlled toys, and lighting, automotive electronics, etc., will begin to put low-power Bluetooth into their products. Since the driver is already included in the operating system, users no longer need to find a driver for the Bluetooth chip manufacturer, or drive development for themselves. This saves a lot of time for Bluetooth developers.
Different markets for low-power Bluetooth
Although low-power Bluetooth has many advantages, for most manufacturers, if you want to develop low-power Bluetooth products, you have to face many real problems, including:
1. It takes a lot of time to develop iOS and Android apps yourself. 2. Many customers do not have much experience with the antenna design. 3. Low-power Bluetooth cannot support the transmission of big data, nor is it compatible with the traditional Bluetooth protocol.
In response to the above situation, Texas Instruments (TI) recently launched a simple and easy to use BLE development tool SeneorTag to customers, hoping to help customers and application developers solve the above problems. SeneorTag is actually a development board that integrates multiple sensors and a low-power Bluetooth chip CC2541. With SeneorTag, TI offers a complete hardware reference design, an APP reference design (available directly in the IOS, Android market), and a development kit. It can help developers further shorten the development cycle without spending a lot of time on hardware and software design. In addition, TI also provides the complete code of the software, which is customized for development by developers. In addition, on the CC2541, a lot of software is already done, whether it is connected with the sensor or Bluetooth protocol stack, it is in the IC. So users don't need to spend too much time in the software part, just spend more time on the APP design.
SensorTag development board makes development of low-power Bluetooth products easier
TI can have different solutions for different needs of customers. In the past, the general software upgrade was to upgrade the USB to the PC. Now TI can upgrade wirelessly via Bluetooth. The advantage is that it can be made lighter and lighter in design. But USB also has a power supply feature, so TI can also provide a wireless charging solution. TI offers different solutions for compatibility and data transfer issues. If the software upgrade is simple data, TI provides a low-power Bluetooth solution; if it is a relatively large data transmission, TI can also provide CC2560 dual-mode Bluetooth, which is supported by both ordinary Bluetooth and low-power Bluetooth. Basically, the latest flagship smartphones are dual-mode, built-in Bluetooth 4.0 protocol stack. The reason for using dual-mode is to connect with the previous Bluetooth products. Compatibility, transmission rate and power consumption can be taken into consideration. In addition to compatibility between different Bluetooth versions, SeneorTag has been certified by the Bluetooth Technology Alliance for compatibility between different vendors, and has been successfully supported by several flagship mobile phones.
In addition, in recent years, the application of various sensors has emerged in an endless stream, and more and more sensors are beginning to be integrated in mobile phones, tablets and various wearable devices. SeneorTag includes sensors for temperature and humidity, infrared, pressure, acceleration, and compass. By integrating different sensors, customers can meet different needs, and customers can choose to reduce certain types of sensors according to different needs. This development board can be connected to IOS and Android products through Bluetooth low energy. It has the advantage of allowing users to easily and quickly design applications that utilize sensors. Then connect to different products through Bluetooth low energy, and transfer the data to the mobile phone or tablet through the APP.
CC2541 provides a low cost solution
The CC2541 is a single-chip SOC that includes an 8051 8-bit MCU in addition to Bluetooth low energy. Users can run the MCU code directly on the CC2541. It can achieve 97dBm in wireless transmission performance. In addition, this IC is available in a 6*6 QFN package. Due to the low power consumption of Bluetooth, the battery life can exceed one year. From the reference design of XX, the cost of CC2541 is also very low.
CC2541 can switch master-slave relationship for different usage scenarios
Another benefit of the CC2541 is that the part of Bluetooth low energy can be divided into master-slave relationships. Peripherals such as mobile phones and watches can change the master-slave relationship according to different usage scenarios. For example, when the mobile phone is connected to the watch, the mobile phone is the master and the watch is slave; but when the watch is connected with other sensors, the watch becomes the master.
Take a deep breath, close your eyes, the world has the freshest oxygen ... Yu Quan's "Deep Breath" is well known to us, but as the environmental problems become more and more serious, the haze sky also increases, PM2.5 PM10 and so on Vocabulary has also been mentioned more and more, and air purifiers have quickly become popular on the market with this "air quality" trend. Along with this, the air-clean brand has sprung up, and various technologies are dazzling. Which ones are indeed effective and which are just tasteless propaganda? How does the Air Purifier bother us to get rid of pollution? And look at the editors for you.
Analysis of air purifier
The critical value of PM2.5 content is 75 μg / m3
The pollutants in the air mainly include soot, total suspended particulates, inhalable particulates (PM2.5) and fine particulates (PM10). The smaller the diameter of the particulates, the deeper the part that can enter the respiratory tract. 10 micron diameter particles It is deposited in the upper respiratory tract, and particles below 2 microns can penetrate 100% into the bronchiole and alveoli.
1k-5k air purifier prices vary greatly
The air purifier products on the market not only have various functions, but also have prices ranging from thousand yuan to tens of thousands. The pricing of imported products is generally higher than that of domestic brands. Except for the core technology of many brands, the promotion of purification effects is similar, and consumers need to choose according to demand.
The air quality standard of 74 key cities is only 4.1%
According to the data of the press conference held by the State Council Information Office on June 4, according to the new "Ambient Air Quality Standards", the six pollutants SO2, NO2, PM10, PM2.5, CO and O3 were evaluated, 74 new standards In the first phase of monitoring and implementation, the proportion of cities that met the ambient air quality standards was only 4.1%, and the other 256 cities implemented the old air quality standards, and the proportion of cities that met the standards was 69.5%.
Air purifier sales increased by 90.5% compared with last year
According to a report recently released by the China Electronics and Information Industry Development Institute, due to the haze weather, air purifiers have become the most concerned home appliance products, with sales of nearly 2.4 million units nationwide last year, a year-on-year increase of 90.5%; retail The amount reached 5.6 billion yuan, a year-on-year increase of 105.9%.
HEPA filter needs to be replaced in March
The filter of the air purifier is the same as the filter of the water purifier, and it is not effective for a long time. After long-term use, the accumulation of dust on the surface of the filter will also cause the filter to gradually fail. Therefore, when the haze is more serious, the non-washable HEPA filter needs to be replaced every three months.
Merchants claim that the purification rate is more than 99% for the concept of stealing
99% or even 99.99% seems to have become a slogan for many air purifiers on the market. Many brands of products promote their high removal rate of PM2.5 and formaldehyde. In fact, this kind of publicity is more of a kind. The slogan of stealing the concept, the removal rate of 99% is the effect of the material itself on PM2.5 and formaldehyde, not the effect of actually running in space.
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