Yisheng Miao

Application of Smart Handheld Device in Agricultural Product Traceability System

The quality and safety of agricultural products is becoming more and more important nowadays. The devices commonly used are POS (Point of Sales) terminals, electronic scales, bar-code scanners, etc. The mismatches among various devices cause a lot of problems during data communication, synchronization, manipulation and flow control. Here a smart handheld device will be introduced, which can resolve these problems. Highly integrated design reduces the total cost of the traceability devices; an overall control makes the cooperation easy and guarantees the traceability flow more reliable and robust. The device hardware mainly consists of an ARM (Advanced RISC Machines) core, a power management block and some functional peripherals. The implementation of the device focused on four issues: 1. power circuit and power management design in multi-power system; 2. peripheral cooperation under CPU control; 3. signal integrity and power integrity in PCB design; 4. transaction model based software design and database synchronization.

An Energy Efficient Cluster-Head Rotation and Relay Node Selection Scheme for Farmland Heterogeneous Wireless Sensor Networks

A new routing protocol of wireless sensor network is proposed in this paper. Node residual energy, network topology density and the distance to the sink are all under consideration in the cluster-head election, which could improve the network energy efficiency while doing the power consumption equalization. An energy threshold of cluster-head is applied to reduce the frequency of cluster-head rotation. A relay node selection scheme is used to satisfy the network connectivity in large-scale farmland application and lower the power consumption of far-end cluster-heads. Through extensive performance evaluation, results show that the 10% nodes-die network lifespan of ECRRS (energy efficient cluster-head rotation and relay node selection) is about 1.3 times of HEED (hybrid energy efficient distributed), 2.1 times of CHCS (cluster-head cycling switch) and 4.5 times of LEACH (low energy adaptive clustering hierarchy). The cluster-head selection cost of ECRRS is about 38% of HEED and 33% of CHCS. The energy balance performance of ECRRS is a little better than CHCS and much better than LEACH. The energy efficiency of farmland WSN is improved by using ECRRS.

Research on power consumption weighted state machine of farmland WSN node

Wireless sensor network (WSN) plays an important role in the large scale farmland environmental monitoring. Long-term unattended monitoring with limited energy source requires extremely low power consumption. Researches mainly focused on the state transition of the wireless sensor network (WSN) nodes. More energy can be saved when each module is scheduled into the appropriate states according to the nodes relative energy weights in the network. Simulation results show that the node power consumption has been significantly reduced.

Low power design based on seed circulation Supervisory Hand-held device

Food safety becomes more and more important nowadays. Agricultural materials safety such as seed is an important prerequisite for food safety. The seed circulation Supervisory Hand-held device is designed to deal with the problems like market outlets dispersing, manual operation and lack in information etc. Low power design technology brings us smaller size and longer operating time of handheld device. This paper presents a low power hardware design using LTC3577 and LTC2941, and a software power management. The results show that the system power consumption would be greatly reduced by the strategy this paper use.