Embedded Files
The Design
The Design
This CircuitLab design tracks a patient for three symptoms for respiratory disease (represented here by three SPDT switches). When no symptoms are present, a green LED is illuminated. When one symptom is present, a yellow LED is illuminated. Two symptoms results in a red LED, and three sounds an alarm. The design incorporates logic gates to determine how many symptoms are present, which trigger the LEDs or alarms as appropriate.
Logic and Truth Tables
Logic and Truth Tables
C'T'O' = 1
A green LED is illuminated if a patient displays no symptoms.
C’T’O + C’TO’ + CT’O’ = 1
A yellow LED is illuminated if a patient displays one symptom.
C’TO + CT’O + CTO’ = 1
A red LED is illuminated if a patient displays two symptoms.
CTO = 1
An alarm sounds if a patient displays three symptoms.
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