TILT_SENSOR

Published:2009/7/16 4:09:00 Author:Jessie | From:SeekIC

A metal ball sits on top of a metal plate that is mounted on an insulated stand. A metal pin is located at each corner. The metal plate is connected to + 12 V, and the four insulated pins go to the sensor's input circuitry. When the ball is centered (in a nontilt position), it does not contact any of the pins. No electrical connection is made between the ball and the pins. If the sensor tilts toward the north (as shown in the diagram) the ball will roll between pins A and B. That will complete an electric circuit, placing +12V on both those pins. The table shows which pins will be contacted when the sensor tilts in each direction. Pins A through D are connected to the inputs of several 4011 NAND gates (IC1 and IC2). When both inputs of one of the NAND gates go high, its output goes low, lighting the LED connected to it. Note that each of the IC2 gates has both its input pins tied together and to one directional pin to accommodate tilting in directions between the four cardinal points. For example, if the sensor tilts to the northwest position, the ball touches only the A pin. That means that IC2-b's output will go low, lighting LED6 (the northwest indicator). All other directions oper-ate in a similar manner.



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