Design of a Low-Power Cold Chain Logistics Internet of Things System

The temperature monitoring node based on MSP430F149 and CC1101 is designed, which has the low power consumption. The demo machine has been built and passed live test. The temperature monitoring node consists of MCU module, power module, CC1101 interface module and temperature acquisition module. The passive communication protocol is designed which can wake the CC1101 up on radio by polling. In order to collect temperature inside of the freezing truck at low-power consumption, the technology of function macro definition optimization and energy management based on context awareness is adopted. And the aim of monitoring temperature is realized by radio communication module sending temperature data to the sink node. The current is measured when the node run at different mode. When the node run at receiving mode, the measured current is 25 mA. When the node run at sending mode, the measured current is 9 mA. When the node run at sleeping mode, the measured current is 3 mA. The test results indicate that the temperature monitoring node runs stably, which lasts at least 90 days and achieves its objects.