Fecha de publicación: 29/09/2022 Fuente: Wipo "IOT" An NB-IoT intelligent gas meter based on OpenCPU technology. The NB-IoT intelligent gas meter comprises a basic meter (10), and an NB-IoT main control circuit board (50) based on OpenCPU technology, wherein the basic meter (10) comprises a metering assembly (20), a reed switch counter and an electric motor valve, which are coupled to the metering assembly (20), and an intelligent head portion (40) and an LCD display screen (30); the main control circuit board (50) is integrated and mounted on the intelligent head portion (40); and the main control circuit board (50) comprises an NB-IoT module circuit, which supports an OpenCPU, a metering sampling circuit, a valve driving circuit, a menu button, an infrared circuit, an antenna module and an ESIM circuit, which are coupled to the NB-IoT module circuit, which supports the OpenCPU, and a power source circuit and a power source voltage monitoring circuit.