An automated greenhouse control system uses sensors and logic gates to control a water pump. The pump turns ON (P = 1) when: The soil moisture is low (M = 0...
Question 1 Report
An automated greenhouse control system uses sensors and logic gates to control a water pump.
The pump turns ON (P = 1) when:
- The soil moisture is low (M = 0) AND it is daytime (D = 1)
- OR when the manual override switch is on (O = 1)
(a) Write the Boolean expression for P. [3]
Answer Details
(a) Boolean expression for the pump: [3]
P = (NOT M AND D) OR O
[1] for NOT M (soil moisture is low when M=0, so NOT M = 1), [1] for AND D (must be daytime), [1] for OR O (manual override).
The pump turns on in two situations: automatically when soil moisture is low (M=0, so NOT M=1) during daytime (D=1), or whenever the manual override switch is on (O=1) regardless of other conditions. The OR means either path activates the pump.
Note that M=0 means moisture is low (the sensor reads 0 for dry soil), so NOT M converts this to 1 for the logic to work. If M=1, the soil is already moist and automatic watering is not needed.
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