Hair tests are more likely to detect regular than occasional marijuana use. One study found that 85% of daily users tested positive for marijuana, versus 52% of occasional smokers (1-5 times per week). Ingested cannabis was less likely to be detected than smoked marijuana [ 01 ].
For the similarly named concept in computer science, see Finite state transducer. A transducer is a device that converts one form of energy to another. Usually a transducer converts a signal in one form of energy to a signal in another. Transducers are often employed at the boundaries of automation, measurement, and control systems, where electrical signals are converted to and from other physical quantities (energy, force, torque, light, motion, position, etc.).
A Hall effect sensor is a transducer that varies its output voltage in response to changes in magnetic field. In some ways, Hall effect sensors can ultimately perform a similar function as a reed switch, but with no moving parts.or Hall effect sensors, determine the distance from the surface of the magnet where the minimum strength requirement is met. In the video below, we used a Hamlin 55410-3H-02-A Hall effect sensor purchased from DigiKey.