Abstract: The MCU MSP430F149 is used as core in the system, and the thermometer, photosensitive sensor, wireless module and LCD display are used too. The measure of temperature and light is realized by this system. The system is made of one terminal and two nodes, and all of them contain a suit of wireless module to transmit data. The serial number of nodes and current temperature and illumination can be observed on the terminal. The system is lowpower and used expediently through test.

Key words: Environmental monitor, Wireless transmission, Low-power