Self-Charging Temperature And Humidity Sensor In All Lighting Conditions


The sensor’s energy harvesting wireless sensor technology collects and saves the tiniest amount of energy from its environment

The HADAR sensor by Pollux is a wireless temperature & humidity sensor that uses LoRaWAN technology. Powered by a light harvesting cell, it works maintenance-free and an integrated energy store allows operation for several days in total darkness.

Energy harvesting is a relatively new term for describing the powering of low power electronic sensor systems for wireless use, without the need for batteries that will eventually need recharging. The HADAR sensor’s energy harvesting wireless sensor technology collects and saves the tiniest amount of energy from its environment. Wherever there is light, even as low as 50 lux, the OPV cell can harvest this source of energy for battery-less sensors. The collected data is transmitted at regular intervals while a small housing allows easy mounting onto the vertical walls or furniture. This enables easy installation in apartments, attics and basements. With the OPV cell, a maintenance-free operation is offered. The design is made to blend into most environments with a discrete but still distinct design.

Applications are:

  • Smart Buildings: Temperature and humidity data are two of the basic information elements in any smart building solution. The information can be used for optimising heating/cooling and also give the property owner the possibility to supervise the humidity to avoid building damage. The sensor is a full end-to-end solution with sensor hardware, connectivity, web portal and back-end system. The back-end system and data are easily integrated into any building management system. 
  • Hardware-based security: Security is the cornerstone in IoT, especially for sensors in industrial or commercial solutions. The hardware-based security architecture provides secure boot, encrypted firmware and safe key storage, making sure correct data is fed into the business systems without the risk of information leakage or fraud. Using LoRa networks there is no need to add insecure elements behind the company firewall.

Other benefits and technical specifications include:

  •  Accurate measurements of temperature and humidity
  • Best in class performance and coverage resulting from world-leading radio competence
  • Operating temperature: -20 to +60 ± 1 °C 
  • Humidity: 0-100% ± 5% 
  • Frequency bands: 868 MHz 
  • Operating light conditions: 50lx – 2000lx
  • Size: 75 mm x75 mm x 9.6 mm
  • Weight: 65 g

The HADAR measures accurately the temperature and humidity and transmits the information over the LoRaWAN network.






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