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ADC output

Robot FreakRobot Freak Posts: 168
edited 2007-05-23 12:42 in General Discussion
I've got 3 infrared sensors, connected with the following cirquit:
+------[noparse][[/noparse]0.1uF]
          |         |
         GND 5V     |
          |   |     |
          |   |     |
          |   |     |
Vss o-----+   |     +---------------o Javelin ADC in
Vin o---------+     |
Sig o-----[noparse][[/noparse]10k]-----+-----[noparse][[/noparse]10k]-----o Javelin ADC out


So, they take 6 pins. Is it possible to use one ADC out to reduce the pins to 4?

Thanks!

Comments

  • Peter VerkaikPeter Verkaik Posts: 3,956
    edited 2007-05-21 17:10
    How about an analogue multiplexer CD4052?

    ········+
    +
    X0
    |X0···· |··················· +
    o ADCin
    X1
    |X1···· |··················· |
    X2
    |X2··· Y|
    [noparse][[/noparse]10k]
    +---+
    [noparse][[/noparse]10k]
    o ADCout
    X3
    |X3···· |··············· |
    ········|· A· B |··············· |
    ········+
    +············ [noparse][[/noparse]0.1uF]
    ·········· |· |················· |
    ···········|· |················· V GND
    ·········· |· +
    o A
    ·········· +
    o B


    A and B select an input voltage.

    regards peter
  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2007-05-21 19:53
    Another option would be to use a multi-channel ADC.

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    Chris Savage
    Parallax Tech Support
  • Robot FreakRobot Freak Posts: 168
    edited 2007-05-23 12:42
    Thanks for the information!
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