The STEVAL-MKI231KA demonstration board is a kit consisting of a specific PCB, mounting the STHS34PF80 low-power, high-sensitivity infrared sensor for presence and motion detection, which is connected through a flat cable to a generic adapter board (STEVAL-MKIGIBV5) to make it compatible with the STEVAL-MKI109V3. A plastic holder with a Fresnel lens (TMOS63-10) has been provided in the kit for better performance of the device in terms of data acquisition for some applications. The STEVAL-MKIGIBV5 can be plugged into a standard DIL24 socket. The kit provides the complete STHS34PF80 pinout and comes ready-to-use with the required decoupling capacitors on the VDD power supply line. This adapter is supported by the STEVAL-MKI109V3 motherboard, which includes a high-performance 32-bit microcontroller functioning as a bridge between the sensor and a PC. It is also possible to plug the board into X-NUCLEO-IKS01A3, X-NUCLEO-IKS02A1, or X-NUCLEO-IKS4A1. The kit is included in an X-CUBE-MEMS1 expansion software package for STM32. MEMS-Studio is a complete software solution for the evaluation and programming of all MEMS sensors and it is available for Linux, macOS, and Windows operating systems. You can also use the downloadable graphical user interface (Unico-GUI) or dedicated software routines for customized applications.