SFS/BE1: Bluetooth Evaluation Board for Smart Factory Sensors

SFS/BE1: Bluetooth Evaluation Board

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.

SFS/BE1 with SSB Collector

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.

Bluetooth Sensor Technology

Safe Wireless Sensor Extensions for any Control System

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.

User Story Bluetooth Sensor Technology

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.

Secure Sensor Beacon (SSB)

Bluetooth Protocol Extension for Automation

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.

Schema Secure Sensor Beacon

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.

User Story SSB

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.

Energy Cost Optimization via IoT Sensor Technology

Daylight as an extended reference variable of a lighting control system

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.

User Story Luxmeter

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.

Technical Data

System-on-Chip (SoC)
Processor Nordic nRF52840 Bluetooth SoC with ARM® Cortex®-M4 and 32-bit FPU
Clock speed 64 MHz
Flash 1 MB
Security • ARM® TrustZone® Cryptocell 310 Security
• 128-bit AES hardware encryption
• Real random number generator
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
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
Environmental standards RoHS, WEEE

Product Variants

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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