1、 基于超声波测距的倒车雷达设计基于超声波测距的倒车雷达设计 基于超声波测距的倒车雷达设计 -I- 摘要摘要 超声波指向性强，能量消耗缓慢，在介质中传播的距离较远，因而 超声波经常用于距离的测量， 如测距仪和物位测量仪等都可以通过超声 波来实现。利用超声波检测往往比较迅速、方便、计算简单、易于做到 实时控制，并且在测量精度方面能达到工业实用的要求，因此在测距仪 器的研制上也得到了广泛的应用。NRF24L01 是由 Nordic 公司出品的 单芯片无线收发芯片， 工作于 2.4GHz2.5GHz 的全球免申请 （ISM） 频率。芯片包括一个完全集成的频率合成器，功率放大器，晶体振 荡器和调制器。
2、发射功率和工作频率等工作参数可以很容易的通过 3 线 SPI 端口完成。极低的电流消耗，在-5dBm 的输出功率时仅为 10.5mA，在接收模式时仅为 18mA。掉电模式可以很容易的实现低 功耗需求。本文提出一种采用单片机 STC89C52 控制 NRF2401 实现的无 线距离测量系统。通过简单的无线通信协议，实现可靠性与功耗平衡， 该系统能实现对距离的检测。结构简单，可靠，低功耗、实时性的无线 距离检测是该设计的最大特点。 关键字：关键字：单片机 STC89C52 无线传输 NRF24L01 超声波 基于超声波测距的倒车雷达设计 -II- AbstractAbstract Ultrason
3、ic point to strong, slow energy consumption, distance travel through a medium, and are often used for distance measurement by ultrasonic, such as rangefinder and level measuring instrument can be achieved by ultrasound.Using ultrasonic testing tends to be more quickly, easily, to calculate simple, e
4、asy to do real-time control, and in terms of accuracy to meet the practical requirements of industry, and in distance measuring equipment research is also widely used.nrf24l01 is a nordic company production of single-chip wireless transceiver chip, to 2.4ghz2.5ghz the world of work from the applicat
5、ion ( ISM ) frequency.The chip includes a fully integrated frequency synthesizer, power amplifiers, crystal oscillator, and modulator. The transmitter power and frequency parameters can be easily done via the 3 - wire SPI port.Extremely low current consumption, when -5dbm output power is 10.5ma, for
6、 18ma in receive mode only. Power off mode can easily achieve low power consumption requirements.This article presents a wireless using controlled by Single Chip Microcomputer stc89c52 nrf2401 distance measurement system. Through a simple wireless communication protocol, implementing reliability and power balance, the system can achieve the detection of distance.Simple structure, reliable, low - power wireless distance, real-time detection is the biggest feature of this design. Keywords : S
