modified 8 years ago

I NEED HELP FROM YOU GUYS

01:37:24

Hi,
I have a problem, I will explain it to you, I have a circuit with two Signals, those are receiver signals, both are between 0 and 5 Volts.
The signals are from different receivers so If one is receiving, the signal should get threw to the Receiver port.

Oh and yes we have two signals but only one port that we can connect those two to.

I heard that you should not connect 2 output signals together, except when BOTH are open collector or tri-state outputs which isn’t here the case here.

So please help me with examples or words.

The goal is to get two signals to one port without interfirence of the two Signals.

published 8 years ago

lmccoig

8 years ago

Digital or Analogue signals?

sbph

8 years ago

Τι κάνεις ρε ΧΑΛΒΆ

tomsonr

8 years ago

Is this what you where looking for? http://everycircuit.com/circuit/4838661060558848

ElektroTinker

8 years ago

@Imccoig Digital Signals

ElektroTinker

8 years ago

@tomsonr thanks for the efford but more like my other circuit I posted yesterday, but I dont think it would work

tomsonr

8 years ago

No it wouldnt, there would be no way to differentiate the signals. Perhaps you can use a multiplexer -demultiplexer setup?

ElektroTinker

8 years ago

@tomsonr hmm but the signals are only sending Data after each other not at the same time.

tomsonr

8 years ago

Understood, how would you syncronise? Is there a clock signal?

ElektroTinker

8 years ago

@tomsonr I dont no the Two Signals ar from differnt Receiving methods, There is only one used at a time. In standby (no recieving) the signals are on 5 Volts. I tought the solution with the AND is a good idea

tomsonr

8 years ago

You can maybe use an or / xor?

ElektroTinker

8 years ago

@tomsonr Good Idea I will try that

tomsonr

8 years ago

I'm not really sure what you are trying to achieve, can you make a drawing.

ElektroTinker

8 years ago

@tomsonr I tryed it with a Or and it doesnt work. So okay I try to show you, have you took a look on my Attempt circuit? I want two Digital Signals connected to one Port, they never send data at the same time, so That the two signals don t interfear eachother I have to find a solution.

ElektroTinker

8 years ago

@tomsonr Thats a symbolic way to show you http://everycircuit.com/circuit/5762541946142720

tomsonr

8 years ago

Not going to work, youre mixing analog signals, not digital. Look at my first suggestion.

ElektroTinker

8 years ago

@tomsonr Okay I think your taking the Visual Example to exact. The IC's are just there to visualy show you the outputs needed to go to an input so look at it with no details, sry

tomsonr

8 years ago

http://everycircuit.com/circuit/5275884570542080

ElektroTinker

8 years ago

@tomsonr More like it yes but I have one Pin At my Receiving IC and Two Signals coming to it

tomsonr

8 years ago

You'l have to be more crearer than this, are those data signals or simple logic. I am trying to help but you will have to explain in a clear fasion what you are trying to do.

ElektroTinker

8 years ago

@tomsons The signals are data signals they are UART Signals between 0 and 5V

tomsonr

8 years ago

Now youre gettinb a bit clearer, uart cannot be combined you will have to use a multiplexer.

tomsonr

8 years ago

U can use an arduino as multiplexer for uart, multiple sotware serial inputs, and echo it on the output.

ElektroTinker

8 years ago

@tomsonr Hmm but the hole thing has to be one PCB

tomsonr

8 years ago

U can use the separate chip, program it on arduino uno take it out, solder on pcb. (Do'nt forget crystal)

ElektroTinker

8 years ago

@tomsonr Thanks for the help I will start implementing a multiplexer into my circuit.

selman

8 years ago

Is the time interval between the two transmissions, if then use a simple 2-1 multiplexer with the microcontroller selecting which signal passes to the input port. But the other signal wont be received when one signal is passed.

cannellajs2

8 years ago

If this is a real life scenario using an MCU you should use i2c (sometimes called TWI) protocol. It is a two wire (clock and data) protocol specifically used for this purpose (assuming your transferring data in bytes). Should be arduino libraries for this purpose.

eekee

8 years ago

A multiplexer controlled by a signal detector, perhaps, so long as the detector and multiplexer can respond fast enough, perhaps within the first half of the first bit. Actually, I don't understand why an OR gate won't work. Are the signals not normal logic levels, or encoded somehow? If they're not normal levels but not encoded (e.g. RS-232) then you could rig up an or gate in RTL easily enough. If they're encoded, you'll need to understand the encoding to know what you can do. Depending on the encoding, I guess a multiplexer may still work.

eekee

8 years ago

Are they inverse logic, or held at level 1 when there's no data? If so, you'll want an AND gate instead of an OR gate. With inverted logic levels, an AND gate behaves like a NOR gate does at normal levels, and vice versa.

SurgeProtector

8 years ago

use a AND gate

zorgrian

8 years ago

Exclusive OR gate

zorgrian

8 years ago

But your problem is not defined well.

hurz

8 years ago

Right zorg, its totaly unspecific and its like most everycircuit projects. To be here really helpful, it would need much more background/droid knowledge. Anyway, users like to talk about those fantasy projects and feel cool. Also, thats what "tinkering" is all about, tune anything whats tuneable and hope its doing better after you mess around 😉

ElektroTinker

8 years ago

@hurz @zorgoan I got the PCB made and its now working in front of my eyes, so no fantasy hurz!!! But thanks to Zorgian for your help, I know its not perfectly defined but what I think I made clear is that the Signal manager should work without a select like a multiplexer and as I saw you understood it a little. Now I used a NAND with Schmitt Triggers at the inputs and after that a Inverter to get my signals values right and it works. It also would work with a Simple AND but I had to use the free NAND that is not used in the SN74HC132DR on my board. This Board will then be used in EMV test rooms to connect the test devices to the PC outside the room. If you would like to see how I solved my problem go to my Plastic-Optical-Fiber circuit and take a look. Next time i will try to define everything better. So yes there are a few ways out there to solve It better but in my case the customer gave me the parts and a few bonds and rules so I cant just do what I want, I have to follow his command, thats how it works. Thanks to @zorgoan

ElektroTinker

8 years ago

http://everycircuit.com/circuit/5600560408690688

zorgrian

8 years ago

Experimente in einem Trödelladen, vielleicht mit Fantasy-Level-Technologie?

zorgrian

8 years ago

Zumindest ist das relativ harmlos.

hurz

8 years ago

Genaue Problembeschreibung und was am Ende heraus kommen soll, ist nicht einfach. Das muss man lange üben. Aber das wird noch.

ElektroTinker

8 years ago

@zorgrian ??

ElektroTinker

8 years ago

@hurz Ja denk ich auch :)

zorgrian

8 years ago

OK, während es schwierig sein kann, Probleme zu beschreiben, wenn Sie es nicht versuchen, sind die Antworten immer nutzlos!

zorgrian

8 years ago

Er, die Person, die um Hilfe bittet, versucht nicht, das Problem zu beschreiben.

zorgrian

8 years ago

The solution is so easy. Just twist all the wires together, put on a lot of tension and watch the beautiful explosion!

zorgrian

8 years ago

So please help me with examples or words. The goal is to get two signals to one port

zorgrian

8 years ago

Asynchronous Serial transmission of data can achieve many signals into one port, indeed as many as millions of distinct signals can successfully be communicated into one port! Nice hu?

ElektroTinker

8 years ago

@zorgrian Thanks! I am still a electronic apprentice and I have alot to learn mostly in discribing my problems but I really thankful that you showed me a example. Next time I will think about the explaination and I will try to formulate it short but on point.