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Replacing two corresponding switches as one with AND-gates

  • #1
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1
Homework Statement
So this is not homework or an assignment, but usually my questions get moved here anyway. This is from a project I'm working on for my job. A user can choose between DPDT functionality (so having "SensorI" be a doorway that goes up and down, reverse) or add another sensor in place of the first sensor having DPDT functionality. The DPDT requires two +VccRelays.
proxy.php?image=https%3A%2F%2Fi.stack.imgur.com%2FiUqIY.png

The relays on the left can be effectively thought of as simply Vcc. This is my current design. It works. (I implemented and tested it.)

The attempt at a solution
Although, I want the user have less switches to screw up. So I figure there's a way to replace the two switches on the right (SW3 & SW4). Do you think this will work:

I tried to make it easier to understand where the switch numbering is replaced with corresponding letters (where A matches everywhere with A, and B with B). If doing switch B, then the DPDT is enabled.
 

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Answers and Replies

  • #2
berkeman
Mentor
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Sorry, I'm having trouble seeing what you want the circuit to do. Could you post a description and/or a truth table? And it looks like there are some combinations of switch settings where the Sensor output can get connected directly to Vcc and Ground. Will that hurt the Sensor?
 
  • #3
NascentOxygen
Staff Emeritus
Science Advisor
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I think that's the truth table: A⊕B = C = D'
adamaero, the images you cite are not viewable by us. Allaboutcircuits requires registration, apparently.

To include it in your post, you would need to download the image, then upload it to PF.
 
  • #6
Baluncore
Science Advisor
2019 Award
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@ adamaero. If you could fully define and understand the question, you would see the obvious answer. Maybe you need to explain it clearly to others, in completely different ways, so you can see the answer yourself. Can you step back and see or describe the problem from a different viewpoint?
 
  • #7
berkeman
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Can this thread be deleted? I can see all the images (which you cannot). And it appears that I cannot edit the original question
It is very confusing for others if you go back and edit your OP. Please just add a post here with your new images. Thanks.
 
  • #8
berkeman
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If you post the pictures, I can clean up the posts that are us expressing confusion.
 

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