The company Wiliot demonstrated a prototype label with pressure sensors and temperature, can measure and send them to other devices via Bluetooth, without using the battery. Instead, the device changes properties of incident signals, reported in the company blog.
Today the most common system for communication with devices not equipped with a battery passive RFID tags. They allow you to pass the signal due to backscattering, in which they change the characteristics of the incident signal, and the reader compares the modified reflected signal with the original. Such labels are often used as badges, labels against theft of goods in shops and other areas. However, they are rarely able to act simultaneously as active sensors, and most importantly — require the use of special equipment, working with RFID tags.
Wiliot Israeli company has developed a passive tag, transmits data via the Bluetooth standard, supported by most modern consumer devices such as smartphones, computers, and devices. The possibility of using Bluetooth in the labels, working on the principle of backscattering has already been shown in practice in 2015, but full of devices based on this method, so far not been established.
The company did not disclose many technical details about the labels, but some information about them known. The mark consists of three antennas, and in its centre is the ARM CPU family Cortex-M. in addition, the label has temperature sensors and pressure. All these elements are on the thin substrate, which can be a polymer film or paper. Label can transmit via Bluetooth to your serial number, as well as data collected from sensors.
The developers suggest that the primary use of the labels will be tracking the status of goods in warehouses and stores. It is expected that pre-production samples will be available to developers in late 2019, and the mass production and selling will start in 2020.
In 2017, American engineers developed a passive mechanical Wi-Fi label. They consist of a spring and ring, which during the rotation periodically connects the two parts of the antenna and changes the properties of the scattering signal. Because of this, such a device can be used to bedaccommodation data collection devices, in which the rotation of the elements, for example, an anemometer designed to measure wind speed.