MSP430F449
Application based on practical granary temperature and humidity measuring system(3)
source: 21IC Author: Wang Mingming, Wang Zhilin, Yuan Hao, pan Hui time: 2012-03-08-
MSP430F449
Connected by SPI bus and CC2500 chip interface, the sending end and receiving end hardware connection is almost the same, has the versatility, can realize half duplex communication.
data acquisition node is composed of a single-chip microcomputer MSP430F449
Control, timing to temperature and humidity sensor SHT11 sending a read command SHT11 temperature and humidity, temperature and humidity testing information, and outputs a digital signal, MSP430F449
After receiving the value of temperature and humidity, these data will be transmitted to the CC2500, CC2500 shall be responsible for packing, processing of signal, and sends the information to the routing node.
in order to reduce the power consumption of the system, data acquisition nodes usually enter sleep mode in idle, the peripheral module also enter a dormant state, or the power management part is wrong with these peripheral module power supply.
3.2 data transceiver node design
Routing nodes and coordinator are data transceiver node, is responsible for receiving and processing data, mainly by the data processing module (MPS430), wireless module (CC2500) and some peripheral devices, routing nodes are powered by battery, the coordinator is powered by the USB or AC power supply, its structure is shown in figure 6.
The coordinator is connected through the serial port RS 232 and PC, its function is equivalent to an access point, a control signal to the host data acquisition terminal transmitted wirelessly transmitted, on the other hand, receiving data collection and upload to the host.
