Dual Channel Inductive Loop Vehicle Detector - v1.2 PCB Board
Special Price $2.30 was $11.50
Inductive Loop Detector works by detecting an inductance change in wire loop (coil) that is buried in road. It does that by measuring the frequency of the internal oscillator which powers the mentioned coil. When a metallic object moves over the coil it changes its inductance and that in turn changes the oscillator frequency which is measured by the microcontroller.