Inductive Loop Vehicle Detector v2.1 PCB Board

Details

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.

It is used for vehicle access control at door and barrier controls, for monitoring the occupancy and for vehicle counting in parking garages, for traffic light installations and traffic controllers, for direction and speed detection of vehicle traffic (if dual channel version is used), in car-wash plants, etc.

Inductive Loop Vehicle Detector v2.1 PCB Board

Specifications

Tuning: Automatic
Detection type: Presence/Pulse
Presence time: Adjustable in 4 steps (default: 11 min, 33 min, 55 min, infinity)
Pulse duration: 100 ms / 500 ms
Signal filtering: Adjustable in 4 steps (LOW, MED-LOW, MED-HI, HI)
Coil/loop inductance: 20 uH – 1000 uH
Frequency range: 40 kHz – 140 kHz
Frequency adjustment: 4 steps (LOW, MED-LOW, MED-HI, HI)
Sensitivity: 0.001% - 0.5% digital in 8 configurable steps
Detection speed: <10 ms (with LOW filtering stage and loop frequency of 40 kHz)
Startup time: ~8 sec
Power supply: 7-40 V DC / 5-28 V AC
Current consumption: ~0.035 A
Protection: Galvanic isolation + gas discharge tube for lightning protection

Package list

PCB x1

Wiki & External links

Project page with schematics and firmware

Reviews