The Implementation Of Wireless Sensor Network Node Based On CC2420

This paper is focused on the implementation of wireless sensor network node,and chieving the communication capability between two nodes. We choose the CC2420,a IEEE 802.15.4 compliant chip provided by Chipcon corporations RF transceiver,and it need a MCU and few external components to constitute a wireless communication system. Microcontroller is RISC structure based 8 bit controller ATmega128 from ATMEL corporation. We also gave a detailed description of key hardware interface in the paper.Taking the request of low cost,low power,small size into consideration,we chose the low power chip sets and small size packaged external components.Then we charted circuit diagram,created netlist and layouted the printed circuit board(PCB) in the computer aided design software:Protel 99 SE. While layouting the PCB,we gave full consideration to high frequency circuit design rules and utilized four layers structure and large-area ground plane to restrain RF noise. The extended interface is also designed for more sensors.After a lot of debugging work, the nodes can communicate between every two of them and LED can show the information of transmission,reception,acknowledgment etc. And node can also sense light intensity, and send it to center node.When the universal serial port is connected to RS-232 interface,the node can communicate with personal computer then we can monitor the light intensity information on software platform.