The Center for Really Neat Research (CRNR)
Widgit Sensor Types

Bend Sensors



This class of sensors gives a differential resistance when the inner resistive film is bent. The sensors used are approx. 4"x1/4". These sensors are typically used in detection of any flexion, e.g. the bending of a finger.

Magnetic Sensors



These sensors are Hall Effect Transducers (HET). The displacement of a tiny, rare earth magnet can be detected by the HET, which is approx. 1/2"x1/4". The level of detection is highly sensitive to even the slightest displacement of the magnet in the magnetic field and can be used for monitoring various forms of motion, e.g. facial gestures.

Photo Sensors



Changes in light intensity can be detected by cadmium-sulfide photoresistors. These photocells, approx. 1/4" in diameter, can monitor changes in ght intensity. The photosensors have a decreased resistivity (increased conductance) with an increase of light, and vice versa. Their capabilities can be manipulated to detect various physiological actions.

Potentiometric Sensors



Potentiometers are used generally to collect information about the range and motion, i.e. speed, of rotation. Various potentiometers, including micro-potentiometers, ranging from 5k to 25k ohm, can be used for measuring physical movement, such as supination and pronation.

Velostatic Sensors



Velostat» is an antistatic conductive plastic packaging material that changes resistance when pressure is applied to it. Typically Velostat» is sandwiched between two layers of copper foil. These pressure sensors are useful in measuring pressure applied by the user.