9 Channels Sensor Switch

This 9 channels sensor switch circuit diagram is designed using CMOS components. This 9 channels sensor switch circuit consist of only three integrated circuits and some resistors.

9 channels sensor switch circuit Diagram: 

sensor switch


Due to high input impedance, 74HC147 allows to use of 4.7 M resistors to create a logic level "high" to sensor inputs. When one sensor is touched, the resulting low resistance to ground circuit causes IC1 to read a logical level L. If several sensors are touched simultaneously, priority encoder delivers 4-bit code corresponding to the sensor with the highest number.
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