Electronic reading of a mechanical gas meter based on dual magnetic sensing

This article proposes a measurement system controlled by microcontroller unit (MCU) for the electronic reading of mechanical gas meter. The relies on dual magnetic sensing: 1) low-cost low-power primary sensing based reed switches connected to digital inputs MCU, and 2) secondary Hall-effect sensors analogue MCU. In addition, both strategies have an active passive element achieve output insensitive external interfering magnets. A prototype has been implemented characterized under different test conditions confirm its reliability.