• Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Resource icon

Another Vehicle Loop Detector Circuit 2014-01-12

Many intersections have inductive loops buried in the concrete or asphalt that sense the presence of vehicles and initiate a signal light change. Perhaps you have seen the cutouts in the pavement that have been filled with tar. In the case of an advanced left turn arrow, they may be set back from the intersection by several car lengths. If you know what to look for, you can stop on one of these loops and force the left turn arrow even if you are alone in the lane.

Loops are also used in counting vehicular traffic to determine pavement wear and tear and when painting of white lines is warranted.

Here is a circuit that is used to detect a vehicle by shifting an oscillator frequency. Typically, the frequency emitted can be measured by a microcontroller and the software can determine presence or absence of a vehicle over the loop.
Author
Val Gretchev
First release
Last update
Rating
0.00 star(s) 0 ratings

More resources from Val Gretchev

Latest threads

EE World Online Articles

Loading

 
Top