Sensor device

A method of sensing an operational characteristic of a component using a sensor device, the method comprising:

• disposing the sensor device on the component;
• providing the sensor device with a sensor;
• controlling the sensor device to produce time domain data representative of a sensed time dependent characteristic adjacent the sensor;
• using a signal processing component of the sensor device to produce frequency domain data using the time domain data, the frequency domain data indicative of frequency components present in the time domain data;
• controlling provision of power to at least one component of the sensor device according to power management criteria, the power management criteria defining wake up and sleep times whereby power to the at least one sensor device component is caused to be connected during wake time and power to the at least one sensor device component is caused to be disconnected during sleep time;
• and
• during each wake time, the method comprises:
• selecting a subset of frequency domain data from the frequency domain data according to the amount of data that can be included in a single data packet;
• and
• using a low-power wide-area network (LPWAN) protocol, transmitting the selected subset of frequency domain data in the single data packet using a data transmission component of the sensor device;
• wherein only one data packet is transmitted during each wake time.