Abstract:  In order to solve the transmission inconvenience caused by cable data transmission in runoff sampling,
based on a wireless local area network (ZigBee) technology, a low-power sampling system for water and soil
erosion in field runoff is designed. It is used to automatically collect the surface runoff samples and to record the
sampling time and other parameters. TI company’s CC2530 microprocessor is used as the core controller which is
responsible for the wireless data transceiver and sampling device control. The system is composed of a wireless
handheld device and a plurality of runoff sampling devices. Wireless hand-held device and runoff sampling
device are composed of star ZigBee network for data transmission, the hand-held machine as the center node is
responsible for the management of the entire network and the control of each sampling device. The runoff
sampling device is a network node points separating runoff automatically according to the central node sampling
rules. The system uses 12 V lead acid battery as the power supply, and realizes the low power design of the
hardware and software. Field experiment shows that the system has the advantages of convenience, stability and
reliability.

Key words: water and soil erosion, ZigBee, CC2530, low power consumption