| With the social development and the progress of the technology, embedded monitoring system has been widely applied in many fields. Such as smart home, vehicle system, elevator monitoring and other field. In embedded monitoring system,the data is transmitted through transmission cable or wireless.The former transmission speed is very fast and the bit error rate is low, but the limitation is the cost is very high. The wireless transmission device is convenient to be move, and the cost is less than cable transmission.This paper design a embedded monitoring system based on WIFI and GSM. The image data is transmitted by WIFI. GSM can be used to establish SMS or voice communication service effectively, so that the monitoring system information can be acquired in real time. STM32 is used as the system’s microprocessor chip. The Marvell 88W8686 chip is used for WIFI transmission, which based on IEEE802.11g/b standard and can communicate with microprocessor through SDIO or SPI interface.The SIM900 A module is used for GSM communication. The Keil is used for compiling the project code. WIFI transmission is base on the LWIP protocol stack.GSM communication with the microprocessor by AT command.The hardware design and the software code is completed. The experimental tests show that the image can be stable transmitted by WIFI and also can be display on the local LCD and the terminals. The transmission of the system has the anti-interference ability. The SMS is send to a specific mobile phone while the monitoring system open or close by GSM. |
