How to make Analog Mux work with PIC?

Discussion in 'General Electronics Chat' started by udayshri, Mar 11, 2010.

  1. udayshri

    Thread Starter New Member

    Mar 11, 2010
    Hello Everyone,

    In my system I have 8 sensors connected to 8 lines of analog Mux(4051) and one amplifier is connected at the output of Mux. Also the output of Amplifier is connected to PIC.
    I am using PIC16F871 to scan the 8 lines.

    I am using 4MHz crystal. Here if I connect 0.5V (DC) as the input at one of the 8 lines, It gets amplified and PIC can see signal at the I/P lines.
    but if I connect sensors it does not work. I even checked the sensor output at the amplifier output and it shows 5v.

    I used Digital Mux before and it worked perfectly and now when I switched to Analog Multiplexers it does not work.

    Do I need to connect anything extra to make the Analog Mux work with my PIC?
    Kindly let me know if something is not clear.

  2. Audioguru

    New Member

    Dec 20, 2007
    Why did you start this new thread? It doesn't have the schematics and details that are in your old thread.
    I won't search for your old thread to see what is connected wrong.
  3. SgtWookie


    Jul 17, 2007
  4. beenthere

    Retired Moderator

    Apr 20, 2004
    Can the OP clarify this issue?