Design of NB-IoT based Portable pH Detector

Abstract pH is a key factor affecting water quality. Traditional pH detection methods are mostly manually operated, with a large workload, low efficiency, and low detection accuracy. In order to improve the efficiency and convenience of water quality detection, we have designed a portable pH value detector based on NB-IoT(Narrow Band Internet of Things) by combining single chip microcomputer and wireless transmission technology. It uses STM8L152 microcontroller as the core and adopts pH composite electrode to measure the pH value of water samples, which simultaneously achieve online detection and numerical display of pH value. The monitoring values can be transmitted to the main control system through the NB-IoT network, enabling wireless collection and monitoring of environmental water quality pH values at multiple points. The use of this portable pH detector is beneficial for conducting water quality testing and preventing water pollution.