RF-star weekly case card is coming as usual. BLE smart water purifier Water quality is quite important in our daily life. And people would like to use the purifier to drink healthier water from the water pipe. How can we achieve easily monitor and analysis of the water quality? And the purifier is always installed under the water basin. How can we get the data easily? Here comes Bluetooth technology. It can interact with your smartphone. All the data you want can be shown in the APP. You also can know when the filter element should be replaced. Choose RF-star BLE module to ease your development. The new solution RF-BM-2340B1 (based on TI CC2340, CC2340R5) is with UART serial protocol for data transparent transmission. You also can choose it as an MCU, it has rich peripherals: SPI, I2C, ADC. Contact us, when you need the wireless connectivity solutions. www.rfstariot.com info@szrfstar.com

BLE Smart Mattress What functions will be added after the mattress becomes smart via BLE? You may analyze your sleep data every moment. If you have a baby, then it will be quite convenient for you to monitor your baby's sleep status. More and more devices are becoming smarter after they embed wireless connectivity solutions. We are in a brand-new society with efficiency and convenience. Happy to be the one who can experience the life-changing day by day. With the BLE modules (like the RF-BM-2642B1 in the picture) with serial port protocol, your end product development will become easier and quicker. Master and slave roles Automatical connection Password User-defined UUID ... Find RF-star, for more wireless connectivity solutions. www.rfstariot.com info@szrfstar.com

RF-star weekly card is coming again. BLE Printer There are so many advantages that BLE inserted into a printer. ※ Smart connection with the mobile device ※ Lower peak current/average current in idle mode ※ Cost-effective ※ Print docs at any time and anywhere RF-star self-developed an extensive series of BLE modules based on TI, Silicon Labs, Nordic and the domestic ICs. There will be one module that is suitable with your application. RF-BM-2642B1 based on TI CC2642R RF-BM-BG22A3 based on SiliaonLabs EFR32BG22 RF-BM-ND08 based on Nordic nRF52832 RSBRS02ABR based on RF-star RS02A1-A The modules are with AT commands to working under UART transparent transmission protocol. ※ Master-slave ※ Automatical connection ※ Observer ... Find RF-star, find your BLE module www.rfstariot.com infor@szrfstar.com

A healthy pet is a happy pet. With location and activity tracking, these wearable trackers and collars can help make sure your dog or cat is both safe and healthy. A Bluetooth tracker will use the Bluetooth signal from the tracker on your pet’s collar, connected to a Bluetooth-enabled device. With Bluetooth module embedded in a pet tracker, you can track where your pet very precisely.

BLE Cervical Spine Massager There are so many people who are suffering from cervical spine injuries. The massager is quite a good design for people relaxing their cervical spine. A small massager embedded in a BLE module will achieve so many functions you want. RF-star has so many BLE modules which can be used in such applications. RF-BM-2642B1 based on Texas Instruments CC2642R RF-BM-4044B2 based on Texas Instruments CC2640 RF-BM-BG22A1 based on Siliconlabs EFR32BG22C112 RF-BM-ND08C based on Nordic nRF52810 No matter what BLE module you want, you can search on RF-star site. We believe that you can find one that is suitable for your applications. www.rfstariot.com info@szrfstar.com

ZigBee Fire safety system We may find that fire cases happen near us. Many of us are living in high-rise buildings, therefore, fire safety is one of the most important things in our daily life. How can we live a safer life with a smart device? Install the ZigBee fire safety system can achieve the following functions: Achieve real-time status monitoring with IoT sensing technology Cloud management to reduce personnel costs Big data for excavating problems and faults in time, and give timely warnings and notifying users in various ways such as SMS, and telephone With wireless connectivity technology, our lives will be safer and smarter. Find RF-star for BLE, ZigBee, WiFi, Matter, Thread modules Contact us: info@szrfstar.com www.rfstariot.com

The Arrived of Angle(AoA) technology has been introduced to BLE since Bluetooth 5.1 Core Specification for Bluetooth Direction's purpose. Now, Bluetooth 5.1 AoA has been widely used in two fields: indoor positioning, and keyless entry.  Now, we will explain how AoA works and how it applies into indoor positioning with Bluetooth 5.1 AoA technology. 1. Indoor Positioning Technology Overview There are four solutions for indoor positioning: UWB, Wi-Fi, BLE beacon / BLE AoA. For the accuracy range, UWB is 0.1 m ~ 1 m; Wi-Fi and BLE beacon is 5 m ~ 20 m with a larger error range. As the first commercial BLE AoA positioning service company, Quuppa can control the accuracy range within 0.1 m ~ 1 m (with the TI CC254x and Nordic nRF5281x chips). The following is the test data of Quuppa. 2. Analysis of Indoor Positioning Theory No matter what kind of positioning method, the indoor positioning system needs to draw the architectural modeling of the actual scene, deploy the receiver router in the indoor area, and mark the corresponding location on the modeling map. The mobile phone or the beacon module broadcast wireless signals. The receiver router deployed in a fixed position can confirm the location area range of the beacon after received the wireless signals. The arrival angle of the beacon signal can be measured by multiple antennas after confirmed the location area range. Combined with triangulation positioning, the accurate position of beacon equipment can be calculated. Triangulation Triangulation is to measure the position of the beacon device through two sets of AoA data. As shown in the figure below, two sets of antennas can measure one AoA data, and two AoA data can measure the position of device A. Both d and D are known parameters, how we can get θ1 and θ2. 3. AoA Measurement Theory Frequency: Bluetooth operates in the ISM (Industrial Scientific and Medical) band from 2.40 GHz to 2.41 GHz with a bandwidth of 2 MHz. Bluetooth is divided into three broadcast channels 37, 38, and 39. In the Bluetooth v5.x core specification, the extended broadcast of the Bluetooth LE can be broadcasted in any channel from 0 to 39, that is, the Bluetooth v5.1 beacon can work on any Bluetooth channel. (The frequency of Bluetooth is inconsistent when it is working, which will affect the Bluetooth wavelength λ.) Phase: The wireless signal is continuous in the air. The RX receiver receives and demodulates the signal of the entire wave cycle of 0 ~ 2 π under the frequency range. AoA calculation: Supposing that there is a fixed-frequency Bluetooth beacon signal broadcasting in an open area (ignoring obstacles and other 2.4 GHz signal interference in the air). If the two receivers are on the same radius and at the same TX end, at a certain time t, the phase difference received by the RX receiver should be 0. But if the receiver is in a position with an inconsistent radius, at a certain time t, there is a difference in the phase of the RX receiver. If the above diagram...

Bluetooth HID Device What is the Bluetooth HID device? A Bluetooth HID device is meant to provide the service of human or other data input and output to and from a Bluetooth HID Host. What can the technology be applied for? Keyboards, mouse, joysticks auxiliary equipment for the disabled. What do the advantages of Bluetooth HID technology? Cost-Effective Lower Power Consumption Higher Reliability & Security The HID function supports us an intelligent, comfortable, and convenient daily life. Contact us for the wireless connectivity www.rfstariot.com info@szrfstar.com

Nordic launched nRF52832 Sniffer for BLE broadcast packets, which is a very convenient tool for learning and debugging BLE protocols. It can parse data packets from different protocol layers in real-time, so that it can check the frame header and the data carried effectively. It provides detailed information about data packets, Received Signal Strength Indicator (RSSI), Link Quality Indicator (LQI), channel, etc. At the same time, nRF52832 Sniffer also supports the protocol parsing of the captured BLE data. nRF52832 Sniffer can be used to get the specific operation of the protocol and the types of data packets sent back and forth between devices. It is also used as a debugging tool to find out what happens when the protocol does not meet expectations. The nRF52832 Sniffer uses Wireshark as the front end and supports multiple operating systems such as Windows, Linux, and Mac OS. RF-DG-32A is a USB Donlge Sniffer based on a nRF52832 chip launched by RF-star, which supports major wireless standards, including Bluetooth Low Energy (BLE) running on Nordic nRF52832 multi-protocol system-level SoC. RF-DG-32A can provide a high data throughput communication interface through the USB device controller and can be directly connected to the computer. The nRF52832 Sniffer RF-DG-32A launched by RF-star adopts CP2102 and nRF52832 dual chips, and the nRF52832 Sniffer integrated Silicon Labs industrial-grade USB to TTL chipset CP2102 which supports independent LED indication during transmission and receiving. The USB interface uses a CP2102 chip, transfers to TTL through USB, and then connects to the nRF52832 chip through UART. Is the dual-chip design redundant? Is it better to use nRF52840 with USB support? Although nRF52840 supports full-speed USB, nRF52832 plus CP2102 chip can achieve the same USB communication function, and the overall chip price is lower than nRF52840. nRF52832 USB Dongle Sniffer supports BLE 5.0 protocol and is backward compatible with BLE 4.2. RF-DG-32A reserved program burn pad, which supports secondary development. nRF52832 SoC is a powerful and highly flexible ultra-low power multi-protocol SoC, which is very suitable for Bluetooth Low Energy, Antenna, and 2.4GHz ultra-low power wireless applications. ·  ARM® Cortex®-M4 32-bit processor with FPU, 64 MHz ·  Data watchpoint and trace (DWT), embedded trace macrocell (ETM), and instrumentation trace macrocell (ITM) ·  Serial wire debug (SWD) ·  2.4 GHz transceiver ·  -96 dBm sensitivity in Bluetooth® low energy mode ·  1 Mbps, 2 Mbps supported data rates ·  TX power: -20 to +4 dBm in 4 dB steps ·  Supply voltage range 1.7 V ~ 3.6 V ·  Fast wake-up using 64 MHz internal oscillator ·  Type 2 near field communication (NFC-A) tag with wakeup-on-field and touch-to-pair capabilities ·  12-bit, 200 ksps ADC - 8 configurable channels with programmable gain ·  64 level comparator ·  32 general purpose I/O pins ·  3 x 4...