ADC multiplex with 4051

[RFsolution]

Offcourse I forgot the brackets

I made one error in my explanation

the first mux is on AN0 the second one AN1
so in the middle of the for nextloop i need to switch to ADCIN 1

Your single loop for ADCin0 and 1 is not clear to me

[aratti]

Your single loop for ADCin0 and 1 is not clear to me

rmteo has forgotten to set portC. Just add the red line and it will work. (I sugget you to use a small delay)

for i = 8 to 23
PortC = i
Pause 1

  ADCIN 0, AD[i-8]
next i

S0,S1,S2 are on RC0-RC2
Enable of Mux 1 on RC4
Enable of mux 2 on RC3

Remember that as you have wired the system mux2 will start first (from 8 to 15) and then to follow mux1 will be activated (from 16 to 23). If you need them the other way around then swap the wiring of portC.3 & portC.4

Al.

[rmteo]

Offcourse I forgot the brackets

I made one error in my explanation

the first mux is on AN0 the second one AN1
so in the middle of the for nextloop i need to switch to ADCIN 1

Your single loop for ADCin0 and 1 is not clear to me

Yes, I did leave out setting PORTC in my single loop example. If you are using AN0 and AN1, try this.

for i = 8 to 23
  PORTC = i
  if i < 16 then
    ADCIN 0, AD[i-8]
  else
    ADCIN 1, AD[i-8]
next i

You can also use a single analog input by tying the outputs (Z pin) of the muxes together to AN0 then the code is simplified to this. Insert appropriate delays in both cases.

for i = 8 to 23
  PORTC = i
  ADCIN 0, AD[i-8]
next i