Vehicle Loop Detector Circuit Schematic

Extension cable which in turn connects to the vehicle detector.

Vehicle loop detector circuit schematic.

An induction loop vehicle detector comprises an oscillator circuit having a plurality of capacitors switchable in circuit with a road loop under the control of a microcomputer to determine the oscillator frequency. Executive summary of the induction loop vehicle detector. The time will be calculated by arduino when the vehicle interrupts the start laser the timer begins and when the vehicle interrupts the end laser the timer stops and applying the values to the equation arduino will find the speed of the vehicle. Detection distance is much better with a large 6 foot coil.

The microcomputer monitors the oscillator frequency and controls the switching of the capacitors to periodically return the frequency to a predetermined value. View more loop detector loop overview. The detector powers the loop causing a magnetic field in the loop area. The number of turns in the loop is determined by the size of the loop.

Drive a large vehicle over adjacent lanes loop detectors and observe if a false call spillover is detected. This tiny test coil was for testing only on my work bench and although it works detection distance is not very good. This circuit can also be used in conjunction with my delay. The loop resonates at a constant frequency that the detector monitors.

A base frequency is established when there is no vehicle over the loop. For example a 4 x 8 loop will give a detection height between 2 1 2 and 2 3 4 feet. Into the designated loop. Observe the detection call light on the detector module for all sensitivity settings.

Loop detector schematic modified to drive a relay. Loop detectors are available as direct plug in for specific gate operator control boards or use a universal 11 pin octal connector. The octal connector is available as a harness or a mountable socket. For high bed vehicle detection the typical loop size is 6 x 8.

Good practice dictates multiple loops and detectors in this situation. If the inductive loop is placed correctly it will detect vehicle open gate and keep it open until the vehicle clears the gate.