Abstract: In order to meet the requirement of water quality monitoring, the hardware implementation scheme of pH value sensor node based on wireless sensor network is proposed. The design scheme includes four parts: pH value acquisition module, microprocessor module, wireless transceiver module and power module, which can be used to monitor pH value of the lake, river and other different water environment. The hardware modules and software flow are introduced in detail. As a result of wireless transmission, the system solves the difficulties of development, expansion, upgrade of wired communication, which is of low power consumption, low cost, flexible deployment, easy maintenance and other advantages and it is of a broad application prospects.

Key words: wireless sensor network, water quality monitoring, pH value, CC2430