Table 4.

Used sensors in technical solutions of TUIs.

Sensor	Used as	References
Optical sensor	Determining the relative position	[34,42,48,57,73,78,79]
Accelerometers, gyroscopes, magnetometers	Motion measurement	[32,33,34,49,57,73,78,79]
RFID sensors	Antenna, RFID chip	[16,29,30,33,42,43,58,64,68,72,80]
Hall sensor		[57]
Light-dependent resistor	Determining the relative position	[32,33]
Tilt sensor	detect the motion of objects for the management of energy savings of TUIs	[32,33,71]