Magnetic field and lux detection parking lot occupancy monitoring sensor


Parking space is becoming a serious problem due to the continuously increasing number of vehicles on the road. In cities with large population, or in places where sports or artistic events are scheduled, probably we all have experience of driving around in circles looking for a parking space. Sometimes, it is very frustrating to park your vehicles

To reduce this frustration, some cities have implemented a so-called "active parking lot management system", which has the benefits of guiding drivers to open parking spaces, save parking time and costs, increase efficient parking management, improve traffic flow, reduce pollution and energy waste, etc.

car full parking

Full parking situation

Parking occupancy detection

The key to active parking lot management is the reliable detection of available parking spaces. It is achieved by wireless sensor installed in every parking space, which can detect the presence of the vehicle. Parking lot status (occupied or idle) is detected and transmitted to a cloud database and then can be accessed by users through website or mobile APPs to receive real-time updates.

In-Ground Parking lot sensors for Vehicle Detection via magnetic perturbation

WiiHey parking lot sensor

WiiHey parking sensor is built with a geomagnetic sensor and an illuminance sensor to detect the magnetic field and lux change when a vehicle drives to its arrange.

Each sensor continually monitors the background magnetic field to establish a base reference, allowing self-calibration & self-learning so that it is able to differentiate parking events from other electromagnetic interferences.

The dual verification of our parking sensor increases the reliability of the whole system, the false ratio could be less than 0.1%.

Earth’s magnetic field changing caused by vehicles

Earth’s magnetic field changing caused by vehicles

The dual verification of our parking sensor increases the reliability of the whole system, the false ratio could be less than 0.1%.

Each sensor needs to install a NB-IoT SIM card to connect to the Internet via cellular network, and powered by built-in batteries that eliminates the labor cost and expense of cable laying.

Tech specs

  • 3-axis magnetic field detection sensor;
  • Wireless communications network in NB-IoT and UNB-IoT (868/915MHz);
  • Battery life for typical operations: over 5 years;
  • Fully sealed with IP68 level protection;
  • -32 ℃ to 85 ℃ operating temperature range;


  • Dual geomatic sensor & luminance sensor (Lux detection);
  • NB-IoT Wireless communication for ease of installation;
  • Powered by solar charging lithium battery;
  • Robust construction to resist both vandalism and accidental damage;
  • Easy integration with existing parking management systems;


  • Live, real-time data on statuses of each and every parking lot;
  • Enable driving guidance to available parking spaces, improving the traffic flow;
  • Enable best use of available spaces by collecting comprehensive parking information;
  • Enable advanced parking services like car locating, overstay reminder, cash-less payment (3 party softwares);
  • Simplify parking for drivers, parking lot operators, traffic administrators, etc;


  • Parking space occupancy detection;
  • Parking lot charging system;
  • Enable advanced parking space management and planning;
  • Enable advanced parking guide system;


The parking lot sensor uses narrow band (NB) IoT communications technology, which combines high transmission ranges of up to several kilometres in urban environments, with low power consumption. Data are then transmitted to cloud services across the IoT network for further processing and delivery into the end-user’s system.

Architecture of parking lot monitoring system

System architecture

Architecture of parking lot monitoring system

System architecture
(Data transferring with third-part partners)

Hardware installation

Detailed information of parking lot sensor could be found here - WiiUNG Sensor.

mounting sensor on the parking lot

Recess mounted parking lot sensors


mounting sensor on the parking lot

Remote parking space management system

mounting sensor on the parking lot

Guidance & navigation on mobile APP


WiiHey parking lot sensor is easy to install, low-maintenance in-ground vehicle detection sensors gather information on parking space occupancy statuses. The sensors feed data to cloud which can then be used for a range of third-party parking management systems. The data can be used to enable additional smart parking services such as integrated parking guidance, car locating or cash-less payment to further simplify the parking process.