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[Reply #15 on:]

I will try the things you mentioned, and I'll let you know how it goes.

Thanks very much for all your help!

[Reply #16 on:]

I'm interested, because I want to use this mux, but the sample code doesn't seem very complete... can you tell me how it works now and your current code?

Thanks!

[Reply #17 on:]

Just in case anyone reading this needs more analog inputs, I thought I'd pass on a hint that I gleaned from the BeatBearing project in Make (Volume 17):

http://www.beatbearing.co.uk/

That device uses a HEF4067B analog multiplexer with 16 inputs.  It's a Philips (now NXP) part:

http://www.standardics.nxp.com/products/hef/datasheet/hef4067b.pdf

Has anyone used this chip in a similar circuit to the 4051 setup?

[Reply #18 on:]

Yes : http://fluidforms.eu/de/CassiusHow.php

[Reply #19 on:]

I don't get any of this...
I want to read 25 LDR's but first I can't get it to read anything.

Here is how it is wired:

Code:

5V - LDR -|y0   s0|-  D5
          |y1   s1|-  D6
          |y2   s2|-  D7
          |y3     |
          |y4     |
          |y5     |
          |y6     |
          |y7    z|-  analogInPin

What am I doing wrong? And what is the correct code to read the inputs?

[Reply #20 on:]

My previous post was completely wrong... following the arduino page I got this wiring:



with my own code:

Code:

int led = 11;    //just a led
int analogIn = 0;
float analogValue;

void setup() {
  pinMode(2, OUTPUT);    // s0
  pinMode(3, OUTPUT);    // s1
  pinMode(4, OUTPUT);    // s2
  
  Serial.begin(9600);
}

void loop () {
  digitalWrite(2, LOW);
  digitalWrite(3, HIGH);
  digitalWrite(4, HIGH);
  
  analogValue = analogRead(analogIn);
  analogValue = map(analogValue, 0, 1023, 255, 0);
  analogWrite(led, analogValue);
  Serial.println(analogValue);
}

It works!
(If you are not sure about what pins are where it is the same way up as the playground image.)

[Reply #21 on:]

Hey guys, I'm using a couple of 4051's. Just wanted to be sure . . the 4051 GND,Vss,Vee and INH goes to the analog ground and so do the 5V pin of Arduino. Right? does it matter if I connect it to the digital ground of Arduino? Thanks ..

[Reply #22 on:]

Check this:

http://www.arduino.cc/playground/Learning/4051

Pins 6, 7 and 8 to ground


Connecting Arduinos 5V pin to ground sounds like a seriously poor idea.

[Reply #23 on:]

i have a question about the 4051....

if i have 8 pots and run them thru the mux they go into the arduino via a single analog input pin ..... i got that much clear...

but what if i need each one of those pots to feed into 8 separate variables?

currently im doing something like this (not using a mux yet)

int pot1pin=1;
analogRead (pot1pin);

so how would this type of thing work with a mux?.... is it even possible to assign individual vars to each of the 8 pots?

thanks for the help

Mubo....

[Reply #24 on:]

First you tell the 4051 which of it's inputs should be connected to it's output, then you use analogread. repeat 8 times. with 8 different variables.

[Reply #25 on:]

repeat 8 times. with 8 different variables.

Or the same variable as an array and just increment the array index.

like here:-
http://www.thebox.myzen.co.uk/Hardware/MIDI_Footsteps.html