本文介紹一種用于汽車倒車避撞的超聲波無(wú)線距離測(cè)量系統(tǒng)。系統(tǒng)由下位機(jī)與上位機(jī)兩部分組成，下位機(jī)主要由超聲波發(fā)射電路、超聲波接收電路、無(wú)線收發(fā)模塊及單片
機(jī)組成，上位機(jī)由單片機(jī)、無(wú)線收發(fā)模塊、顯示電路等組成，下位機(jī)與上位機(jī)之間通過(guò)無(wú)線收發(fā)模塊傳輸信息。文中分析了超聲波測(cè)距電路的設(shè)計(jì)方法，敘述了采用無(wú)線通信技術(shù)實(shí)現(xiàn)數(shù)據(jù)遠(yuǎn)程傳輸?shù)脑O(shè)計(jì)思路。該系統(tǒng)測(cè)量距離方便、靈活、穩(wěn)定。
關(guān)鍵詞：無(wú)線通信；單片機(jī)；超聲波；距離測(cè)量；溫度補(bǔ)償
Abstract: A kind of ultrasonic distance measurement system used in the car is designed in
this paper. The system includes the lower microcomputer system and the upper microcomputer system. The lower microcomputer system is mainly composed of ultrasonic transmitting circuit, receiving circuit ，wireless communicating module and microcomputer. The data from the lower microcomputer system is transmitted to the upper microcomputer system by the wireless way. The design principle of ultrasonic distance measurement circuit is analyzed. The design method that the data is transmitted is also introduced. The system is of the characteristics of measurement convenience, fast response and stability.
Key words : wireless communicating；microcomputer； ultrasonic；distance measurement； temperature compensation