Introductory Mechatronics Question

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Discussion Overview

The discussion revolves around designing circuits using push buttons to generate specific logic levels (logic '0' and logic '1') based on the state of the buttons. The focus is on two types of push buttons: normally closed and normally open, with participants providing sketches and seeking feedback on their designs.

Discussion Character

  • Technical explanation, Homework-related, Debate/contested

Main Points Raised

  • One participant presents two circuit designs for normally closed and normally open push buttons, seeking validation and assistance.
  • Another participant agrees that the initial circuits appear correct but suggests improvements in the representation of the switch symbols.
  • A third participant challenges the correctness of the initial circuits, arguing that the output connections may lead to incorrect logic levels when the switches are pressed or released.
  • A later reply acknowledges the correction and admits to having misunderstood the output connections in the original designs.

Areas of Agreement / Disagreement

There is disagreement regarding the correctness of the initial circuit designs, with some participants supporting the designs while others assert they are incorrect. The discussion remains unresolved as participants continue to clarify and refine their understanding of the circuits.

Contextual Notes

Participants express uncertainty about the correct wiring and output connections, highlighting potential misunderstandings in circuit design principles. There are also references to specific circuit symbols that may not be universally recognized.

baillik
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Okay, two questions:
1) Using a normally closed push button, design and sketch a circuit that will generate a logic '0' when the button is pressed, and a logic '1' when the button is released
2) Using a normally open push button, design and sketch a circuit that will generate a logic '0' when the button is pressed and a logic '1' when the button is released.

My answers are the in the attached pictures, sorry about the sad paint drawings haha. I really have no idea what I am doing and I have no access to the answers, so any help at all would be appreciated.
Thanks!
 

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Your circuits look correct for giving the logical "0" and "1". However, you might want to show the normally closed switch like this (shown closed):

[PLAIN]http://www.kpsec.freeuk.com/symbols/swpbrk.gif

And the normally open switch like this (shown open):

[PLAIN]http://www.kpsec.freeuk.com/symbols/swpush.gif
 
Last edited by a moderator:
dlgoff said:
Your circuits look correct for giving the logical "0" and "1". However, you might want to show the normally closed switch like this (shown closed):

[PLAIN]http://www.kpsec.freeuk.com/symbols/swpbrk.gif

And the normally open switch like this (shown open):

[PLAIN]http://www.kpsec.freeuk.com/symbols/swpush.gif[/QUOTE]


okay, I will change that.
thank you for the help!
 
Last edited by a moderator:
Actually both circuits are not correct.

If the output is connected to one of the supply rails, then the output will not be affected by the switch.

[PLAIN]http://dl.dropbox.com/u/4222062/logic.PNG

In the circuit at left, if the switch is closed, the output will be high, but go low if the switch is opened.

In the circuit at right, the output will be low if the switch is closed, but high if it is open.
 
Last edited by a moderator:
Thanks vk6kro for catching this. I had his circuits reversed in my mind and didn't notice where his outputs were taken from.

@ baillik: Sorry about that.
 

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