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With the help of the Bluetooth evaluation board SFS/BE1, various Bluetooth sensors can be integrated into practically any control solution. In the process, the Bluetooth sensor data and received by a suitable collector functional unit and converted into a data format and interface protocol suitable for the respective PLC. Until now, machine and system designers have
been unable to use the wide range of IoT wireless sensor options, including machine-learning-based real-time data analyses, if the corresponding options for the PLC to be used in each case were missing. This problem can now be solved: per SFS/BE1, for example, the overall data image of the reference variable can be extended by a virtual sensor system.
Such an IoT retrofit enables innovative applications from the fields of condition monitoring and predictive maintenance, e.g. to transmit machine and plant states to PLCs as continuous or categorical output variables. But also air quality, CO2 and energy efficiency optimizations in building automation can be evaluated with the SFS/BE1.
Sensor data that is included in a control application, for example as part of a reference variable, must be trustworthy in any case. Therefore, the scope of delivery of the SFS/BE1 includes the functional components of a digital trust chain, such as cryptographic methods to automatically check the authenticity of each individual sensor reading.
The SFS/BE1 Bluetooth evaluation module can be equipped with various sensor elements, e.g. the BME680 gas sensor or a CCS811 air quality sensor. The respective measured values are continuously transmitted to the sensor support docker together with a digital signature.
In Docker, the sensor data can be preprocessed and analyzed depending on the application. The respective result is transmitted to the controller using a suitable protocol.
You are planning to integrate wireless sensor technology into your building or plant control system and want to evaluate different sensor scenarios to create an extended data picture at the control input to improve overall efficiency.
To do this, you need highly secure wireless sensors that are very easy to install and provide your control system with the appropriate data.
The SFS/BE1 uses SSV's newly developed Bluetooth protocol extension Secure Sensor Beacon (SSV/SSB) for Bluetooth Low Energy (BLE). This allows trusted sensor data to be captured in machines and systems and transmitted to PLCs.
In addition to sensor data fragmentation via multiple BLE beacon data packets, SSV/SSB supports verifiable data integrity and sender authentication via Message Authentication Code (MAC).
A detailed technical description of SSV/SSB can be found here on GitHub.
We are a maintenance service provider for renewable energy plants. For our customers, we want to develop an easy-to-install Bluetooth monitoring sensor for machine competencies whose output data can be accessed by several users simultaneously.
In addition, the sensor data must be transmitted to a PLC, which sends a notification in case of malfunctions. Approximately 100 to 200 bytes of sensor data are generated per measurement. Since costly decisions are derived from these measured values, secure sensor data authenticity is very important to us.
An SFS/BE1-OPT3001 has an optical sensor for measuring illuminance in lumens per square meter. This area-related luminous flux has the unit lux (lx). In measurement technology, this is therefore also referred to as a luxmeter.
The luxmeter measurements are carried out periodically. The desired measurement interval time can be set. The current measured value is transmitted to the SSB collector using the SSB protocol and from there to the PLC.
Since the lux measured values are included in the set point (or reference variable) of the lighting control system, a secure data authentication is required, i.e. a check of the sender authenticity as well as data integrity for each measured value transmitted by radio.
In our factory halls, we use small PLCs to automatically switch the ceiling lighting on and off. The set point is a calendar with the working days, the current time plus defined switch-on time periods of the individual light strips.
Our halls have glass elements in the ceiling and facade. Therefore, we want to use an SFS/BE1-OPT3001 to find out whether the inclusion of daylight in the set point of the control system leads to clearly measurable energy cost savings and whether we can thus actively contribute to climate protection.
As part of this evaluation, we also want to determine the investment costs per control system in order to determine the ROI of such a project.
| System-on-Chip (SoC) | |
|---|---|
| Processor | Nordic nRF52840 Bluetooth SoC with ARM® Cortex®-M4 and 32-bit FPU |
| Clock speed | 64 MHz |
| RAM | 256 KB SRAM |
| Flash | 1 MB |
| Security | • ARM® TrustZone® Cryptocell 310 Security • 128-bit AES hardware encryption • Real random number generator |
| Software | |
| Operating system | Zephyr RTOS for IoT devices |
| Protocols | Bluetooth protocol extension Secure Sensor Beacon (SSB) version 1.0, based on the Bluetooth 4 standard |
| Security | Random 128-bit data key factory preprogrammed (editable) |
| Miscellanious | Sensor module interface driver |
| Interfaces | |
| Socket | 1x mikroBUS™ socket for sensor modules |
| Antenna | 1x external antenna through U.FL connector |
| UART/Debug | 1x 6-pin connector |
| ARM SWD/ICE | 1x 10-pin connector |
| USB | 1x USB-C 2.0 receptacle |
| Displays / Control elements | |
| LEDs | 1x Power/system status |
| Buttons | 1x Reset 1x SSB pairing mode |
| Jumper | 1x Power mode |
| Electrical characteristics | |
| Power supply | 5 VDC via USB or 3 VDC via battery (CR2450) |
| Power consumption | typ. ?? mA @5 V / typ. ?? mA @3 V |
| Mechanical characteristics | |
| Mass | < 50 g |
| Dimensions | 79.2 mm x 50 mm (without sensor module) |
| Operating temperature | 0 .. 70 °C |
| Standards and Certificates | |
| EMC | CE |
| Environmental standards | RoHS, WEEE |
| SFS/BE1-BME680 with environment sensor | |
|---|---|
| Manufacturer / Type | Bosch Sensortec GmbH BME680 (product page) |
| SFS/BE1-BMM150 with magnetometer | |
| Manufacturer / Type | Bosch Sensortec GmbH BMM150 (product page) |
| SFS/BE1-BMI160 with accelerometer and gyroscope | |
| Manufacturer / Type | Bosch Sensortec GmbH BMI160 (product page) |
| SFS/BE1-CCS811 with air quality sensor | |
| Manufacturer / Type | Sciosense B.V. CCS811 (product page) |
| SFS/BE1-OPT3001 with ambient light sensor | |
| Manufacturer / Type | Texas Instruments Inc. OPT3001 (product page) |
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