Multiplexing with 74HC4067


#1

How would you go about that in xod? using the 74HC4067 or similar?
Would love to multiplex analog inputs (pots), and output, via demultiplexing, multiple DC outputs from 0-5v.

Can it be done? I’m a compllete noob:)
thanks!


Library 4067 read-write
#2

Hello, you can try this and comment if it works

cesars/4067 update!


#3

Cool! thanks!

In my noobness, i cant seem to find that node. Where is it located in xod? Isnt there a search bar in the software somewhere?

If it doesnt work, and there is no node for it, can you make your own? I have no programming skills, but i have seen other examples, and the code for it, so i guess i could pretty much copy paste that.

thanks!


#4

the name of the node is ctrl-4067

add the library


#5

Ok. Thanks. Found it.


#6

load the library again, is updated


#7

You are freaking amazing!
If you could make a small explanation on how to use it in an actual project (just explaining the ins/outs), that would be awesesome, but only if you have time - I dont really know how to hook it up myself:) Will go get a arduino nano and the 4067 chip today, and test next week.
Wohooooo!!


#8

update with an example, I hope it’s useful, let me know if it does not work
this only works for inputs


#9

I dont really get it, but like look into it:)
I know how a multiplexer works, but can’t really follow everything. But again. I’ll experiment and look into it.

It seems to me that you have a clock generator, and from there you go to a device that steps up from 0-15 I would assume, and the number 6, in green, is where the step has reached? The select block, I don’t fully understand. Also don’t understand the “value” on the lower left.

But I’ll get it at some point:)

Is there an output version in the works?:wink:
Or maybe I can find that somewhere else?


#10

Ok, VAL is the reading of PORT (A0), with a, b, c, d you control the outputs ABCD for channel 0-15, if it is at 6 the value that arrives at PORT is channel 6(0-15), and that value will you can see in VAL

PORT, INH, A, B, C, D are ports in arduino

update, please try it


#11

THANKS MAN! :slight_smile:
I dont have time to test it now, but will probably try it out sometime next week.


#12

WOHOOO. the multiplexing part is working! (well, only have one pot to test with -10k lin -), its working, and i can move the pot to different locations and they all work.

One question:
I get analog value, ranging from 0-96, i actually thougth i would be getting 0-1023?

another one:
Filtering:
I multiply the analog in by 20, just to get a good readout with decimals, to read pot reading stability
And at the extreme pot point (closed), i get a pretty jumpy value between 0 and 2,5. Other pot locations seem pretty solid.
Could this be a psu thing? (running the board from my pc at the moment), maybe i need to solder in a cap somewhere between each pot output connection to the multiplexer?
I can do filtering in XOD, in the sense that i could apply low pass filtering, but my logic tells me that this wont fix the 0-2,5 problem, only small jittery things (which is also needed). Something like a low pass filter/lag processor/slew limiter is needed for the jitter correction. How would i go about doing htis in xod?

If you have any tips/tricks, please reply here: Pot filtering help

I’ll keep this thread used only for multiplexer stuff (i’ll probably have other questions, once i need to de-multiplex).

thanks


#13

Ok, i updated to your newest nodes. A couple of things i dont understand (and yes, its me not you;)

In the node “example 1”. If i plug the output of the 4067 common in/out to the A0 in of my arduino, i get a pot reading from 0 to 97.
Then i tried for fun to take the common in/out and connect it to analog 1 instead, and still got a reading. This time from 0-60. and in a2 i get a reading from 0-38 and i can go on from there. Is this normal behaviour? Maybe i connected something wrong.

With a 10k lin pot connected the the4067, what is the normal max value i would get? Thanks!


#14

I have a hard time understanding English, could you upload an outline of your connection?
I do not understand if the value 0-97 is at the exit of 4067 or the reading in XOD.
To adapt the signal you must use map or map clip node

With those nodes you can not do read write, unless you use 2 HC4067

If you are going to read, delete the dataselect and 4067-write nodes

test-4067-read.xodball (1.8 KB)


#15

Thanks. I’ll look into it and write later.