Nordic nRF52811 SoC builds on the success of the Nordic nRF52 Series platform and brings richer connectivity for applications adopting advanced wireless Internet of Things capabilities (such as Bluetooth 5.1 direction finding, thread, and ZigBee). nRF52811 SoC is the fourth-generation product of the nRF52 Series platform, which extends the platform to cover many applications and use cases. Protocols supported by radio, including Bluetooth 5.1 direction finding, all Bluetooth 5 features, 802.15.4, Thread, ZigBee, and proprietary 2.4GHz. nRF52811 SoC has 4 DBM TX power, which is optimized to provide the best reception sensitivity of all SoCS in the nRF52 series: BLE remote: - 104 dBm BLE-1 Mbps：-97 dBm 802.15.4（Thread/ZigBee）：-101 dBm This SoC device combines the low-cost features of Nordic's entry-level nRF52810 SoC with the multi-protocol support of mainstream nRF52832 and high-end nRF52840 SoCs.  nRF52811 is also the first Nordic low-power wireless connectivity product in the family to support Bluetooth 5.1, adding a direction-finding feature for Bluetooth 5 with high throughput, long distance, and enhanced coexistence function. nRF52811 SoC can realize the latest and most powerful functions of Bluetooth 5.1, the most prominent is the direction-finding function, which pushes the Bluetooth positioning to a new height. Based on the strong basic support of the nRF52811 chip, RF-star can supply a mature Bluetooth indoor positioning solution for customers. Nordic nRF52811 SoC is built around 64 MHz arm ® cortex ™ - M4 CPU and has a series of digital peripherals and interfaces, such as PDM, PWM, UART, SPI, and Twi. It also has a 12-bit ADC. Using an advanced on-chip adaptive power management system can achieve extremely low-energy consumption. It also includes a multi-protocol 2.4GHz RF module with 4dbm output power, - 97dBm sensitivity (in Bluetooth 5 1Mbps mode), a 64MHz 32-bit arm ® cortex ™ - M4 processor, 192KB flash, and 24KB RAM. nRF52811 SoC joins the Nordic multi-protocol product family to meet the most extensive application requirements today. Nordic can provide ideal solutions no matter whether the main needs of developers are direction finding, supporting popular RF protocol, high throughput, long distance, or price. As an excellent Bluetooth solution provider in China, RF-star can provide customers with high-quality Bluetooth solutions. nRF52811 SoC Bluetooth 5.1 direction finding function makes the positioning solution not only dependent on the Received Signal Strength Indicator (RSSI) but also based on the actual direction of the signal, which significantly improves the positioning accuracy and opens up a new application space. There are two methods to determine the direction of the signal: one is to calculate the angle of arrival (AoA) of the received signal, and the other is to calculate the angle of departure (AoD) of the transmitted signal. The DF function can be used in two-dimensional or three-dimensional space, which...

What will the future automated parking be like? Today, we may use BLE to control automobiles to achieve the PKE and PEPS. Without AoA AoD support, BLE cannot reach a "cm" level locating, regardless of the antenna array for AoA AoD, we may try other technologies. In order to achieve more specified functions, Let's try UWB! What functions will be? L4 Indoor Automated Driving Secure Interconnection cm Level Positioning

In 2017, with the emergence of the bicycle sharing mode, the traditional travel field was instantly overturned. However, while it brings convenience to people's life, it also causes some disadvantages. When there is a lack of management of "stop and release as needed", it becomes a disorderly stop and release, which not only brings a lot of inconvenience to others, but also brings great troubles to city managers and bicycle-sharing operators. In order to further improve the parking order of shared bicycles, Bluetooth electronic fence technology has become a feasible solution. Bluetooth electronic fence technology is based on Bluetooth's positioning, broadcasting and transmission functions to realize vehicle entry management and vehicle on-site statistics. What Is Bluetooth Electronic Fence? Bluetooth electronic fence refers to the platform planning and setting up a certain area, allowing and standardizing the parking of shared bicycles in this area, and placing Bluetooth beacon equipment in this area, which can detect the shared bicycles installed with Bluetooth within a radius of 50 meters. If the vehicle is parked beyond the specified area or traveling beyond the specified area, the system will generate a series of alarm notices, so that the manager can check and know the dynamics of the relevant vehicle in time and take corresponding measures to deal with it. The public electronic fence realizes data interaction through Bluetooth, and its signal and data coverage accuracy can reach Yami level, management is accurate to vehicles, and can be compatible with the standard parking of different brands sharing bicycles. The sharing bicycle Bluetooth electronic fence scheme is based on the integration of bicycle perception, electronic fence induction, long endurance and other technologies, through Bluetooth wireless broadcast, positioning and transmission services, under the premise of ensuring the long endurance of nodes, to achieve stable and reliable electronic fence services such as bicycle perception, fence induction, etc., to achieve the interconnection of sharing bicycle, bicycle parking point, operation service platform, effectively solve the urban management difficulties caused by the disordered development of Internet shared bicycles. Three Implementation of Electronic Fence There are three main technical implementation methods of electronic fence: Electronic fence based on satellite positioning technology (GPS); Use the Bluetooth device of the bike lock to read the electronic fence of the Bluetooth label fixed at the parking point; The Bluetooth of the user's mobile phone reads the Bluetooth electronic tag of the parking point and the electronic fence of the vehicle-mounted Bluetooth tag; The first and second technologies rely on satellite positioning technology and Bluetooth device on the bike lock respectively, which is relatively hidden visually. The third type of installation and deployment is extremely convenient, which is convenient f...

Wireless Ebike BMS: Battery Management System What functions will be added to the wireless E-bike? Real-time monitoring to prevent over-charging and over-discharging More safety Theft-proof Extend the Battery life Remote control by mobile phone

Automobile makers has been caught in crunch of electronic components shortage，albeit the trend of intelligent cars is irresistible. As the most instant and impressive evidence of smartness to users, the PEPS （Passive Entry and Passive Start）system is no more a high profile feature only for high end cars. It has been introduced to mid-tier or even economical models by many car makers, emerging brands in particular. In China market where EV sales witness more than 100 percent growth in the first half of 2022, major electric car makers such as BYD, GAC Aion, Geely, Nio, Xpeng and Li Auto have basically equipped all models with PEPS. While that ECU quietly stuns us motorists, have we ever thought of probing the trail of its making and the prospect of its future? Let’s hit the road. PEPS provides motorists with experience of securely entering the car without manually unlocking activity. The engine and HVAC system of the car can be remotely started before the driver or passengers enter the car. While all passengers leave the car, the PEPS will automatically lock the car. In this way, car users enjoy the convenience of passive entry with security reassured. That must be why we name it with the word “passive”. Yesterday: RKE and PKE Currently, mainstream PEPS solutions integrate wireless technologies such as Bluetooth Low Energy (BLE), NFC, RFID (High Frequency and Low Frequency) etc. Well, how do they function? It would be hard to digest if we tell story as of today. So, why don’t we flash back to yesterday？ In the end of 1990s, some high-end car models phased in a remote keyless entry (RKE) system an evolution over the earlier IMMO (immobilizer) solution based on low frequency RFID (125KHz). As a predecessor of the PEPS, the RKE has the key fob to transmit UHF（ultra- high frequency）signals to a RF receiver connected with the BCM (body control module) of the car to verify user identity. Once the ID is verified, the system will execute an open/close-door action driven by the BCM. Such a one-way verification mechanism as shown in Figure 1 can be interpret as an advance-set cipher in a spy movie. When a visiting secret agent comes to a meeting venue, he or she has to speak or show such a cipher. If the cipher is correct, he or she will be allowed in. The drawback of this mechanism is that once the enemy infiltrated and got the cipher, the venue will be instantly broken. Figure 1. Working Mechanism of RKE The RKE solution adopts frequency bands of 315 MHz (in USA, China and Japan etc.), 433.92 MHz (in Europe, China) and 868MHz (in Europe）. In term of signal modulation, most countries adopt the ASK (amplitude shift keying) mode, whereas Japan adopts the FSK (frequency shift keying) mode. IC vendors such as Silicon Labs, Maxim, Microchip and NXP etc. have offerings in this field. By early 21st century, people upgraded the one-way verification mechanism of the RKE to a two-way mechanism called the PKE (passive keyless entry) system, where the verification is n...

Here comes intelligent irrigation! What are the differences between traditional irrigation and intelligent one? Save water Save energy Save labor Remote control Real-time soil moisture monitoring Easy installment With wireless technologies such as Wi-SUN, Sub1G, LoRa, LoRaWAN, agriculture will become more and more intelligent.

In the first half of 2022, the shipment of the global New Energy Vehicle (NEV) market took off, and the sales of NEVs in mainland China in the first half of the year were particularly prominent, creating an astonishing result of a year-on-year increase of more than 100%. When new energy vehicles become a household topic, people's requirements for battery systems become increasingly high. They expect manufacturers not only to improve battery life, but also to ensure safety and stability. As a result, a major innovative technology in the industry is about to emerge, that is, wBMS, or wireless battery management system. The cost of BMS accounts for about 20% of the power battery of NEVs. The traditional BMS connects the battery packs with cables, and then bridges them with daisy chain interfaces. The use of cables and mechanical interfaces is space consuming, which actually squeezes the room for battery energy density improvement. The wireless BMS replaces the traditional ring circuit by deploying wireless modules on the BMS host and the battery pack node, realizing the star + ad hoc network mode for necessary communication of battery management. The wireless method not only increases the energy density improvement space, but also greatly reduces the labor in the battery assembly stage. And with wireless solutions manufacturers does not need to consider investment big money on isolation between the high and low voltage circuits in the battery. In the traditional mode, in event of an accident or aging caused by long distance riding, some cable might get broken or contact of some interface would become poor. It is easy to cause the power battery system to disfunction. In that case, the power battery needs to be replaced as a whole. The potential economic loss to the car owner is considerable. The wireless method does not have the problem of wire and interface failure, and because of its wireless characteristics, it naturally has the advantage of modularization. Even if there is a problem with a certain part of the battery pack, you can just take out the faulty battery pack for replacement without disposing the entire power battery. Due to the above-mentioned advantages, leading car makers began to consider wireless BMS technology from 2019. So far available or upcoming models with wireless BMS technology include: BMW i3 (2022), GM's Hummer EV (2024). Texas Instruments, which is deeply involved in the field of automotive electronics, took the lead in launching the CC2662R-Q1, the world's first wBMS SoC solution that complies with ISO 26262 ASIL D standard. The chip deploys the TI's proprietary Simplelink wBMS protocol over the 2.4GHz band. The solution can manage and support up to 100 nodes, and specified to couple with BQ79616-Q1 battery monitor, it can be used for different configurations, such as 16, 32, and 64-cell battery systems. The wireless approach in which the battery module transmits battery data directly to the BMS MCU overcomes the challen...

The liquid level gauge is a special instrument for liquid level monitoring that integrates the functions of liquid level detection, data acquisition and transmission. It is mainly used to monitor the real-time data of the liquid level in the container and the natural environment. The Bluetooth module is implanted to make it wireless. Thus, after the liquid level gauge completes the sensing, the signal transmission and information interaction can be completed wirelessly, making its deployment safer, more convenient and more reliable in use. Challenge Liquid level gauges are usually used in harsh industrial environment which is subject to high temperature, strong corrosion, strong adhesion, dust and soot, making it great danger to manually survey with traditional liquid level gauges. Manually measured and recorded data is also subject to inaccuracy. However, factories keep elevating bars for the quality, immediacy, reliability and storability of sensing data. Traditional liquid level gauges can no longer meet such requirements raised in latest industrial production scenarios. At the same time, complex terrains of some industrial sites make it extremely difficult for equipment wiring. The deployment and construction cost of traditional wiring methods between transmission nodes is high, and the cost for maintaining the system will also be high. Solution By building a Bluetooth module into the liquid level gauge, the liquid level gauge can transmit data such as its power level, sensing signal strength, liquid level data information, and alarm information to the terminal device in real-time through the wireless network. The terminal equipment stores and analyzes the data, makes inquiries or  raise alarms, thereby realizing convenient deployment, collection, and maintenance while ensuring the safety of personnel. Keep tracking consumption status in real-time The wireless liquid level gauge is made by connecting the meter with a built-in Bluetooth module functioning as a data-transparent transmission unit. The receiving end of the wireless liquid level gauge is responsible for the data display and gauge setting. It also distill and output analog and switch signals to the terminal equipment. It detects liquid level in closed or open containers, processes relevant data, and automatically raise alarm and augment data whenever the level reaches a preconfigured threshold or the battery’s voltage is too low. It thus enable us to reduce manual intervention in survey and ensures the accuracy of the measurement as well. Through the terminal equipment, we can better monitor and manage the liquid level of the tank, tracking the consumption level in real-time, and ensuring the safety of personnel. Low deployment and maintenance costs The wireless level gauge greatly reduces the cost of trenching and wiring and later line maintenance. It does not need to lay cables, nor damage existing structures of the factory, saving labor and engineering costs. Meanwhile, wir...

RF-star Weekly Case Card: BLE Electric Valve Let's see what disadvantages the BLE electric valve has: Difficult to monitor High operating costs Lack of flexibility How does the BLE electric valve work? Real-time monitoring, improve the work efficiency Easy to control by remote, achieve a higher production efficiency Easy installation and maintenance, ensure the safety of the workers Lower operating costs Reduce batch loss For more solution support, contact us at www.rfstariot.com