Calibration Unit for Airborne Germ Collectors

In this project, CORESIGHT was entrusted with developing a calibration unit for electrical airborne germ collectors (eLKS), which demonstrates improved performance compared to the predecessor product. Technically, there is already quite a lot under the hood of this device. An ultra low power 32-bit Cortex M3 microcontroller processes sensor data, records the airflow and handles communication to the host computer. A bistable display (E-Ink) working with the emWin graphics library was used to display the measurement data. The device is powered by a 9V battery and must handle more than 500 calibrations without a battery change. CORESIGHT was able to achieve the required calibration target here through targeted power saving measures. CORESIGHT was entrusted with realising the complete electronics, the entire firmware and the entire software for this project. The mechanical design, the manufacturing of the mechanical components and final assembly are carried out by the customer or the customer's sub-suppliers. The electronics design was created in Altium Designer, the firmware was created in Keil MDK Arm. The software was developed using Visual Studio. Tasks in the area of electronics:

• Display evaluation and testing
• Low power MCU with integrated EEPROM
• Ultra low power circuit design (power supply from 9V battery)
• Pressure sensor, temperature sensor, light barrier for speed detection
• Bistable display (E-Ink)
• Shock sensor for determining transport damage

Tasks in the area of firmware:

• Significant improvement of the light barrier algorithm for speed detection (adaptive pulse counter)
• Deep sleep mode of the MCU
• Implementation of emWin library for full graphics display on the bistable display
• JSON communication from the calibration unit to the PC
• Debug mode for transmission of all measurement data

Tasks in the area of software:

• Connection to SQL database for data storage
• Complex algorithm calculation for device adjustment
• Access restriction via database to control software distribution
• Complete control of the test bench for the traceability of the eLKS
• Calibration and adjustment reports generatable as .PDF