Simple design challenge solution

windozeuser · Mar 6, 2006

Hey, can anyone please review my solution to a design challenge for class. I want to see if I solved it the best way possible.

Thanks!

(excuse the BMP to JPG defects on the conversion)

Klaus · Mar 6, 2006

now that you solved that one how about the same idea but using only TWO wires?

Klaus

windozeuser · Mar 6, 2006

is it possible? Without using a ground?

Russlk · Mar 6, 2006

You can do it with two wires using two DPST switches, but not with push buttons.

mstechca · Mar 7, 2006

If you can increase the complexity, you can make the same circuit with ZERO wires.

If you need an answer immediately, grab a pair of walkie-talkie's and press the "call" or a button on them that emits a buzzer.

eblc1388 · Mar 7, 2006

I don't see how it is possible using just two wires and DC battery to ring two bells in separate offices, and the requirement that both bells must ring when the buttons (or whatever kind of switch) are activated by people in the other office.

For those who commented that it can be done, a circuit diagram or schematic would be of great help to me.

pebe · Mar 7, 2006

eblc1388 said:
I don't see how it is possible using just two wires and DC battery to ring two bells in separate offices, and the requirement that both bells must ring when the buttons (or whatever kind of switch) are activated by people in the other office.

For those who commented that it can be done, a circuit diagram or schematic would be of great help to me.

How about this. The resistor is to limit current if both buttons are pushed together.

eblc1388 · Mar 8, 2006

No bell rings if both buttons pressed.

The real challenge is "to do it in two wires" as if when three wires are used. Some users said it can be done but I cannot see how it is possible. It seems that the requirement that both bells should ring has been overlooked.

Of course it is possible to setup some form of communication at both ends but that's not a solution in the spirit of the original question. So telephones options are out.

Simple solution is to use AC power supply and diodes.

pebe · Mar 8, 2006

eblc1388 said:
No bell rings if both buttons pressed.

........It seems that the requirement that both bells should ring has been overlooked.........

I didn't see that requirement in the original posting.
Unless both pushes are pressed and released within a split second of one another, the bells will ring - albeit briefly.

eblc1388 · Mar 8, 2006

pebe said:
I didn't see that requirement in the original posting.

Does the original posting explicitly excluded the case that Office B cannot call Office A while Office A is ringing Office B and vice versa?

If not, then you are making an assumption that they must do it in turns.

pebe · Mar 8, 2006

eblc1388 said:
pebe said:

I didn't see that requirement in the original posting.

Click to expand...

Does the original posting explicitly excluded the case that Office B cannot call Office A while Office A is ringing Office B and vice versa?...quote]
No, and it didn't specifically include that proviso, either. But I'll accept your point.

mramos1 · Mar 10, 2006

windozeuser said:
Hey, can anyone please review my solution to a design challenge for class. I want to see if I solved it the best way possible.

(excuse the BMP to JPG defects on the conversion)

Not sure if I can draw it on here, but will try.

Code:

  +--------+--------------------------------------------------+
-----         |                                               |
  --             >switch                                    >switch
-----         |                                               |
  --          BELL                                         BELL
  +--------+--------------------------------------------------+
           Office A                                    Office B

Roff · Mar 10, 2006

mramos1 said:
windozeuser said:

Hey, can anyone please review my solution to a design challenge for class. I want to see if I solved it the best way possible.

(excuse the BMP to JPG defects on the conversion)

Click to expand...

Not sure if I can draw it on here, but will try.

Code:

+--------+--------------------------------------------------+ ----- | | -- >switch >switch ----- | | -- BELL BELL +--------+--------------------------------------------------+ Office A Office B

That will ring your own bell. You will be alerted that you are trying to contact the other office. :roll:

Simple design challenge solution

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