Hi everyone,

I have a problem. I had to take a course in electronics which is not my field and I have a final exam due in 2 days. This is one of the questions in the exam which I'm struggling with. I was hoping someone could help me. Thanks in advance
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In a production plant, heated metal boxes are cooled, by a strong blowing fan, as they move on a transfer belt. The timing belt is always moving. A presence sensor A (ON/OFF) provides a “high” signal as long as a box is passing under it and provides a “low” signal when there is nothing underneath. The metallic boxes should be cooled alternately fast or slow to produce harder or softer boxes. Therefore, “high” and “low” fan speeds should be used alternately with every other box (one fast-cooled, one slow-cooled, and so on).


(a) You are asked to build a simple logic device (controller) that uses the presence sensor signal A as the input to generate an output Y that changes the speed of the fan, for every other box to low and high (logic Y = 0 for low fan speed and logic Y = 1 for the high speed). To design this device, you have access only to one negative-edge triggered JK flip-flop and some other simple gates (the total number of the simple gates you may use cannot be more than five). Briefly explain how your designed circuit works and use timing diagram in your explanation when necessary. Hint: start by looking at the timing plot of the output of the sensor A and the timing requirements of the controller output Y as a result.


(b) To save cost, the management has decided to process their new type of non-metallic boxes in the same production line. As a result, there will be non-metallic boxes (with the same dimensions) coming on the same transfer belt in a random order. You decide to use a metal sensor M in the same place as the presence sensor A to detect if a part is metallic or not. Sensor M (outputs a logic high when it is in close proximity of metals and low for any other case). The nonmetallic boxes are to be always cooled fast (high fan speed). However, for the metallic boxes, it is still very important to keep the same sequence (alternating slow and fast) as they enter the cooling station independently from occasional non-metallic boxes. Modify your logic device designed for part (a) of the problem to accommodate for this requirement. Again, you have access only to one negative-edge triggered JK flip-flop and some other simple gates (the total number of the simple gates you may use cannot be more than five). Briefly explain how your designed circuit works and use timing diagram in your explanation when necessary.
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We don't do your homework for you, so you have to show your best effort in solving the problem, then we can help.
A good place to start is a sequential truth table or flow chart of what needs to be done.

 

Have you made ANY attempt to work through this on your own?

If so, you might have noticed the following statement: "Hint: start by looking at the timing plot of the output of the sensor A and the timing requirements of the controller output Y as a result."

You might give that a try.

 

Hi everyone,

I have a problem. I had to take a course in electronics which is not my field and I have a final exam due in 2 days. This is one of the questions in the exam which I'm struggling with. I was hoping someone could help me. Thanks in advance
""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
In a production plant, heated metal boxes are cooled, by a strong blowing fan, as they move on a transfer belt. The timing belt is always moving. A presence sensor A (ON/OFF) provides a “high” signal as long as a box is passing under it and provides a “low” signal when there is nothing underneath. The metallic boxes should be cooled alternately fast or slow to produce harder or softer boxes. Therefore, “high” and “low” fan speeds should be used alternately with every other box (one fast-cooled, one slow-cooled, and so on).


(a) You are asked to build a simple logic device (controller) that uses the presence sensor signal A as the input to generate an output Y that changes the speed of the fan, for every other box to low and high (logic Y = 0 for low fan speed and logic Y = 1 for the high speed). To design this device, you have access only to one negative-edge triggered JK flip-flop and some other simple gates (the total number of the simple gates you may use cannot be more than five). Briefly explain how your designed circuit works and use timing diagram in your explanation when necessary. Hint: start by looking at the timing plot of the output of the sensor A and the timing requirements of the controller output Y as a result.


(b) To save cost, the management has decided to process their new type of non-metallic boxes in the same production line. As a result, there will be non-metallic boxes (with the same dimensions) coming on the same transfer belt in a random order. You decide to use a metal sensor M in the same place as the presence sensor A to detect if a part is metallic or not. Sensor M (outputs a logic high when it is in close proximity of metals and low for any other case). The nonmetallic boxes are to be always cooled fast (high fan speed). However, for the metallic boxes, it is still very important to keep the same sequence (alternating slow and fast) as they enter the cooling station independently from occasional non-metallic boxes. Modify your logic device designed for part (a) of the problem to accommodate for this requirement. Again, you have access only to one negative-edge triggered JK flip-flop and some other simple gates (the total number of the simple gates you may use cannot be more than five). Briefly explain how your designed circuit works and use timing diagram in your explanation when necessary.
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Hi,

So this isnt really homework then, just study for a test?
You have to tell us what you have learned in the past about these systems,and the best way to do that it so show your own attempt at solving it so we can follow.