Answer Happy

Question 4 a) Figure 1 shows a pictorial view of an oven, along with the associated input and output signals. All inputs and outputs are two-state variables, and the relation of the states and the variables is indicated. Construct Boolean equations that implement the following events: (CLO1/2) -F (1-On) P (1-On) Power D(1-Closed) Door switch Fans T(1-Over) S (1-On) Heater H (1-On) Figure 1 i. The heater will be on when the power-switch is activated, the door is closed, and the temperature is below the limit. ii. The fans will be turned on when the heater is on or when the temperature is above the limit and the door is closed. iii. The light will be turned on if the light switch is on or whenever the door is opened. [7 Marks] b) Develop the control system of an automatic coffee-vending machine. Insertion of a coin and pushing of buttons provides a paper cup with coffee that can be black, with sugar, with cream, or with both. Describe the features of the machine as a discrete-state system. (CLO1/2) [8 Marks] c) Prepare a flow chart to describe the event sequence of the coffee-vending machine based on Q4b. (CLO1/2) [10 Marks] Light switch Light Temperature L (1-On)