Founded in 1854, O'Fallon's namesake comes from Colonel John O'Fallon who was a wealthy gentleman from St. Louis. In downtown O'Fallon, a Baltimore and Ohio Railroad railroad depot was built, which helped put O'Fallon on the map.
â¢ Transducers and sensors are physical devices that are used in electrical, electronic and many other types of gadgets and appliances. â¢ Transducers are used to convert one energy type into another while sensors measure energy levels and convert them into electrical signals that can be measured digitally.
The electronics in the sensor convert the resulting sinoidal signal into a digital signal (Fig. 4) . The signal is transmitted to the control unit in the form of a current signal using pulse width modulation. The sensor is connected to the control unit via a two-wire electric cable. The sensor signal is transmitted via the power supply wire. The other wire is used as an earth for the sensor.