Abstract: A sensor interface for interfacing with a sensor such as an electrochemical sensor, a temperature sensor or the like in which the interface comprises a memory configured to store data received at the interface from a sensor. The sensor interface is configured to assess the difference between data values in the memory, and to transmit advertising packets at a rate dependent on the difference between the values. The sensor interface includes a volatile memory and a non-volatile memory. The volatile memory is configured to store data received at the sensor interface from a sensor. The non-volatile memory is configured to store data stored in the volatile memory. The sensor interface is configured such that: data received at the sensor is stored in the volatile memory forming stored data until the volatile memory is substantially full and then at least some of the stored data is transferred to the non-volatile memory.

Abstract: A sensor interface for interfacing with a sensor such as an electrochemical sensor, a temperature sensor or the like in which the interface comprises a memory configured to store data received at the interface from a sensor. The sensor interface is configured to assess the difference between data values in the memory, and to transmit advertising packets at a rate dependent on the difference between the values. The sensor interface includes a volatile memory and a non-volatile memory. The volatile memory is configured to store data received at the sensor interface from a sensor. The non-volatile memory is configured to store data stored in the volatile memory. The sensor interface is configured such that: data received at the sensor is stored in the volatile memory forming stored data until the volatile memory is substantially full and then at least some of the stored data is transferred to the non-volatile memory.

Abstract: An RFID transceiver tag is proposed for use in a monitoring system for detecting a change in position of the tag relative to an associated RFID tag or to the environment surrounding or between the tags. The transceiver tag has a detector for detecting a characteristic of a signal transmitted between the transceiver tag and the associated RFID tag and for creating a trigger signal if the detector detects that the characteristic has changed beyond a predetermined extent; and a transmitter for transmitting a signal to a remote controller on receipt of the trigger signal from the detector.