Not Enough...

Discussion in 'Embedded Systems and Microcontrollers' started by MLCC, Aug 24, 2008.

  1. MLCC

    Thread Starter New Member

    Aug 15, 2008
    8
    0
    Hello,

    I am trying to power all sorts of things with my microcontroller, problem is that it provides little voltage at all the pins (Between 0.4-0.6V). Even when trying to get a transistor to help switch a larger voltage (Larger voltage is at 9V) , its output stays at around 0.8-1.1V. Any ideas to fix this problem?
     
  2. hgmjr

    Moderator

    Jan 28, 2005
    9,030
    214
    A schematic would help us better appreciate the loading issues you are facing.

    hgmjr
     
  3. kammenos

    Active Member

    Aug 3, 2008
    127
    0
    eeeeeeee?????????? Please revise
     
  4. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Microcontrollers generally have very limited current source/sink capacity.

    It would help a great deal to at least know that microcontroller you were using.
     
  5. MLCC

    Thread Starter New Member

    Aug 15, 2008
    8
    0
    I'm using a 8051F350 microcontroller.
     
  6. Arm_n_Legs

    Active Member

    Mar 7, 2007
    183
    10
    Did you have a base resistor when connecting the transistor to the IO port? You can directly connect the ULN2803 transistor array chip to the IO to save the trouble.
     
  7. nanovate

    Distinguished Member

    May 7, 2007
    665
    1
    Do you have the pins set up as outputs?

    This is a Silabs part-- correct?
     
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