Can you have a logic circuit with 3 outputs?
I have an assignment to do and the question is regarding building a logic circuit for an industrial oven.
There will be three input points labelled A B and C to a control circuit. It states that logic 1 must indicate the temperature is correct.
Three LEDs will be used to indicate the conditions of the circuit, with only one LED on at a time.
Red - if the temperature is correct at 1 point or at no points
Yellow - if the temperature is correct at 2 points but incorrect at any one point
Green - if the temperature is correct at all three points.
Is this all one circuit, and three outputs or have I misunderstood the requirements for this question? If it's one circuit how do I make it so only one LED is on at any one time?
If anyone could help that would be massively appreciated - I've been sat down for hours and I just can't understand what to do.
- JohnLv 61 month ago
I would use an Western Electric, telephone stepper switch. Cost prohibitive and heat sensitive. LOL. A simple logic circuit, Boolean Algebra.
- MorningfoxLv 71 month ago
Three inputs, each goes to three circuits.
Circuit #1 controls the red LED.
Circuit #2 controls the yellow LED.
Circuit #3 controls the green LED.
Now you just have to design each circuit. That's 3 different designs.
Using a 3-8 decoder is a good idea, but I bet you're supposed to use just basic gates: AND, OR, NOT, NAND, NOR.
- billrussell42Lv 71 month ago
as I understand it, there are 3 outputs each driving a LED.
you have inputs A,B,C
red if A,B,C are all 0 or if one of A,B,C = 1
Yellow if any 2 of A,B,C =1, the other =0
green if A,B,C all = 1
I'd use a 3-8 decoder which gives you outputs of 0 thru 7
A B C output
0 0 0 A
0 0 1 A
0 1 0 A
0 1 1 B
1 0 0 A
1 0 1 B
1 1 0 B
1 0 1 B
1 1 1 C
so you take outputs 0,1,2,4 to a 4 input OR gate for red
outputs 3,5,6 to a 3 input OR gate for yellow
output 7 for red.
An ALS138 for the decoder, and a bunch of gates following it for the OR gates, and some LED drivers.