The program wireless sensor sub-machine using TI,s 16-bit single-chip ultra-low power MSP430F2012 as the core, host MSP430F41X used as the core, combined with CC1100 wireless sensors and ultrasonic range finder with the outside world to achieve automotive obstacle detection alarm distance. Ultrasonic Ranging wireless sensor uses lithium battery-powered, on-chip 10-bit ADC in the Timer-A regular testing under the control of the supply voltage, ranging sensor uses popular reality ultrasonic sensor can achieve wide-angle of 60 degrees away from the obstacle detection ; ultrasonic sensors in the MCU through the week under the control of the conversion to level sensor provides up to 100V voltage field around the launch of ultrasonic signals, external obstacles encountered in the ultrasonic sound waves generated reflection, this time to return to being a part of acoustic sensors through external signal amplification transported by low-noise level of side-pass filter, after entering the chip signal waveform acquisition ADC10, interception peak waveform as detected by echo signal point in time, in this process as ultrasonic Timer-A launch to receive back the time difference timer waves through the acoustic propagation velocity of the car, such as calculated by the distance barrier with the outside world; detection distance data transmission in real time through the CC1100 to install indoor driving the host, the distance from the host showed the situation of obstructions; 4 ~ 9 from the real-time detection machine initiative outside obstacles, the real-time, efficient and fast. Host received from the plane sent a distance of obstructions to the public through the voice chip is accurate to 0.1 meters away from the accuracy of alarm given by the drive-chip LCD driver liquid crystal display and battery voltage, such as distance information; external crystal 32.768KHz CPU can be used as the closure of the state of the Basic-Timer clock source, as a system of real-time clock, calendar, accuracy up to 1S / day, could serve as a vehicle to use the clock. The program has a low power consumption, long battery life, small size, convenient and flexible installation, low error rate, high reliability, the system simple combination of characteristics such as wireless sensor reversing radar is the best option. Details Web site: www.lierda.com.

MSP430F2012 characteristics:
¡ù low operating voltage range: 1.8 ~ 3.6V
¡ù ultra-low power:
        Patterns of activity: 200uA @ 1MHZ, 2.2V
        Standby mode: 0.5uA
        Power-down mode (RAM data retention mode): 0.1uA
¡ù five power-saving mode
¡ù wake up from standby mode does not exceed 1us
¡ù 16 bit RISC Reduced Instruction system, 62.5ns instruction cycle
¡ù 2 zones capture / compare register 16 regular Timer-A
¡ù USI support for Universal Serial Interface SPI, I2C interface
¡ù 10-BIT, 200KSPS, A / D converter

MSP430F413 characteristics:
¡ù low operating voltage range: 1.8 ~ 3.6V
¡ù Flash Capacity: 4 ~ 32K
¡ù ultra-low power:
        Patterns of activity: 200uA @ 1MHZ, 2.2V
        Standby mode: 0.7uA
        Power-down mode (RAM data retention mode): 0.1uA
¡ù five power-saving mode
¡ù wake up from standby mode does not exceed 6us
¡ù 16 bit RISC Reduced Instruction system, 62.5ns instruction cycle
¡ù 3 zones capture / compare register 16 regular Timer-A
¡ù LCD controller / driver (up to 96)
¡ù chip comparators, can be used for analog signal can be used for comparison or hypotenuse A / D conversion