The KAmod ESP32 POW+RS485 board contains the ESP32-WROOM module enabling communication in a 2.4 GHz Wi-Fi wireless network. A USB-UART converter with a USB-C connector was used to program ESP32. The module is connected to the RS485 interface – a popular solution in home and industrial automation, enabling communication via a 2-wire twisted pair, e.g. in the MODBUS standard. The board is complemented by an efficient power supply system that operates at an input voltage of 8 to 32 V, and provides stabilized voltages of 5 V and 3.3 V with significant current efficiency. The board’s design corresponds to the Raspberry Pi SBC family – it has dimensions of 81×56 mm, and all important I/O ports and supply voltages are led out on a characteristic 40-pin connector.