Infrared distance measurement system based on signal-chip microcomputer
An infrared ranging and single-chip technology, which is applied in the field of infrared short-distance measurement, can solve problems such as affecting the accuracy of ranging, and achieve the effects of expanding the range, fast processing, and improving measurement accuracy.
Inactive Publication Date: 2014-07-02
TIANJIN UNIVERSITY OF TECHNOLOGY
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Traditional infrared ranging is mainly calculated by using the time difference between emitted light and reflected light. For the range of unit m, the time difference between emitted light and reflected light reaches ns level, which is close to the upper limit of single-chip processing. An important reason for precision
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[0029] like figure 1 As shown, the infrared ranging system based on PIC16F877 single-chip microcomputer provided by the present invention includes single-chip microcomputer PIC16F877, infrared ranging dual modules, threshold selector, digital control selection circuit, digital display tube and alarm; described infrared ranging dual modules It is connected with PIC16F877 single-chip microcomputer, and PIC16F877 single-chip microcomputer is connected with threshold value selector, digital control selection circuit and digital display tube in turn, and PIC16F877 single-chip computer is connected with alarm at the same time.
[0030] like figure 2 As shown, the strobe terminal G of the 74LS154 digital selector is active at low level, and the data selection terminal S is connected to the output signal of the threshold selector LM339, and the output of the input data A and B is controlled by the output high and low levels of the LM339; after selection The signal is output from th...
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The invention discloses an infrared distance measurement system based on a PIC16F877 signal-chip microcomputer. A sharpGP2 series infrared distance measurement sensor module is adopted, and the distance measurement accuracy is effectively improved; dead zones generated when the distances between sensors and a barrier are equal to the lower limit, namely 20 cm, of an effective detection range are avoided by adjusting measurement tasks of the infrared distance measurement sensors under different distances. According to the infrared distance measurement system, a starting signal of one of the two infrared distance measurement sensors is set to be the high level one through a digital circuit, and a starting signal of the other one of the two infrared distance measurement sensors is set to be the low level zero through the digital circuit; meanwhile, a returned analog signal is converted by an A / D converter into a digital signal, and therefore the sensors are controlled to be started or stopped; by means of the improvement, the upper limit of the measurement range of the infrared distance measurement system can be expanded to be 150 cm, and meanwhile the minimum measurable distance is as precise as 4 cm. Due to the fact that the infrared distance measurement sensors are stable in performance and low in price, the infrared distance measurement system can be popularized in a large-scale mode.
Description
technical field [0001] The invention belongs to the technical field of light wave measurement, in particular to an infrared short-distance measurement technology based on a single-chip microcomputer. Background technique [0002] In recent years, ranging technology has developed rapidly, and its applications in production and life are becoming more and more extensive. Laser ranging, microwave radar ranging, ultrasonic ranging, and infrared ranging technologies have emerged successively. Among them, laser ranging is based on the laser beam irradiating the target object and detecting the distance through the reflected beam. Laser ranging is easily affected by bad weather, high cost and inconvenient to maintain; microwave radar ranging technology is mainly used in military and some industrial development equipment, the development cost is expensive, the universality of application is poor, and it is difficult to use it in the civilian market on a large scale Development; Ultr...
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IPC IPC(8): G01S17/08
CPCG01S17/08G01S7/4873G01S7/51
Inventor 周成华于杰江宁
Owner TIANJIN UNIVERSITY OF TECHNOLOGY