Trespasser field sensor | developed by Sensing Clues Social Enterprise


Detects the presence of electronic devices. The sensor communicates via GSM (minimum GPRS) or LoRa, is solar powered and contained in camouflaged IP67 housing. If properly tuned and placed, the sensor can function unattended for at least 12 months.


Detection of people in areas where they are not allowed. The sensor can count the number of devices and differentiate between frequently encountered and new ones. To protect the privacy of visitors, anonymization technologies have been implemented (privacy by design), meaning that no person-related data can be deducted from it. This is not required anyway. By checking out the site, rangers will find out who the trespasser is and what he or she is doing.

To optimise its functioning, alerting conditions can be added. Alerts will only be sent if these conditions apply. Think of time slots, minimum duration of presence or group size, etc.

Multiple Trespasser sensors can be used to form intelligence networks. The detection of devices that frequented several hotspots or did so in specific order may be more alarming than others. Due to the embedded privacy-by-design technology, these functions are designed per case, thus allowing for the proper application of legal principles: 1) prepared for specified goal, 2) proportional to the risk, and 3) not replaceable by less intrusive means (subsidiarity). These principles also imply that applications are time-bounded. As soon as the risk is contained, the measures need to be lifted.