Reflective sensing unit for objects recognition and microcontroller processing - with output voltage compared with limit voltage valves that can be adjusted using counting cycle performed by processor

摘要

The device reflects the output from an optical transmitter (10) from the surface of the object to be received (11) for transmission to a windowing comparator (15). This has two stages comparing the input with a pair of limit values (U1,U2). The greater or less than signals are provided as input to a micro-controller (17) with an AND-gate (16) used for actuation. Within the micro-controller a cycle is performed in which counting takes place until a reference is reached. The input voltage range is dependent upon the number of pulses counted. USE/ADVANTAGE - Allows input voltage range to be varied.