Speaking of wireless vehicle detectors, there are still a lot of people who don’t know what it works. Today, our geomagnetic detector is a small series for everyone to briefly describe the working principle of wireless vehicle detectors.
When the coil is buried in the ground in advance, the inductance of the coil in the LC oscillating circuit changes due to electromagnetic induction, and the frequency of the generated oscillating signal changes, and then the waveform conversion circuit, the frequency doubling circuit and the counting circuit are converted into a single chip microcomputer. The recognized digital signal, the timing interrupt processing program of the single chip compares the current frequency and the reference frequency value to change, and performs appropriate processing to send the processing signal to the corresponding execution hardware, thereby realizing the function of detecting the vehicle and taking corresponding actions. Factors affecting the change of oscillation frequency are: vehicle, climate, drift of component parameters and so on.
Specifically, the wireless vehicle detector can be divided into an input module, which mainly realizes detecting a sine wave of a certain frequency corresponding to the arrival of the vehicle, and determines the arrival of the vehicle by checking the sine wave; the output module is controlled by the output circuit. To control the relay, so as to control the lifting and horn of the control rail; communication module – using ICL232 integrated chip to achieve logic level conversion, can communicate directly with the PC through the serial port; the judgment module – is the wireless vehicle detector The core is mainly composed of a shaping amplifier circuit, a counting circuit, a frequency multiplying circuit, a single chip circuit and a watchdog circuit.
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