LED dot matrix

Discussion in 'The Projects Forum' started by teivel, Jul 9, 2014.

  1. teivel

    Thread Starter New Member

    Jul 9, 2014
    4
    0
    Hi, my purpose is to find the output of led dot matrix connected to pic16f88 using flowcode V3.6.11.53. This is the led dot matrix im using. [​IMG] I try to light up each col and row first. This is the output i found for COL0-7 [​IMG] (due to using demo version of flowcode, the outputs can be used are limited ). Output for col6 and 7 are 191 and 127. When i try to light up row0 with the output of 254 at port A and 0 [​IMG] [​IMG] Please help
     
  2. MrCarlos

    Active Member

    Jan 2, 2010
    400
    134
    Hello teivel

    It is difficult to understand your paragraphs In the midst of those gigantic pictures.
    Removing them I think this is what you say:

    Hi, my purpose is to find the output of led dot matrix connected to pic16f88 using flowcode V3.6.11.53. This is the led dot matrix im using.

    I try to light up each col and row first.

    This is the output i found for COL0-7 (due to using demo version of flowcode, the outputs can be used are limited ).

    Output for col6 and 7 are 191 and 127. When i try to light up row0 with the output of 254 at port A and 0

    Please help.

    Do You have the data sheets of the dot matrix ?
    Surely therein is described how to handle it.

    Let me take the data you mention:
    I will assume that the numbers you have are decimal.
    For column 7 You have 127.
    And to row 0 You have 254.

    127 (Dec) = 01111111 (Bin). – column 7.
    254 (Dec) = 11111110 (Bin). - row 0.

    R7 1
    R6 1
    R5 1
    R4 1
    R3 1
    R2 1
    R1 1
    R0 0
    CCC 0 1 1 1 1 1 1 1
    CCCC7 C6 C5 C4 C3 C2 C1 C0

    We need to know if to turn on a column of LED’s, must be low or high.
    consequently:
    The rows will be the other polarity.
     
  3. teivel

    Thread Starter New Member

    Jul 9, 2014
    4
    0
    hi mrcarlos, sry for posting gigantic pic that make u difficult to read ( didnt expect it would be like this )and i missed something. whn i give output of 254 at port a and 0 at port b, the led at row0 lights up but also led in row5,6 & 7... i dont have data sheet of the dot matrix. btw , when u give output of 127 to port A , the led at row 5,6 and 7 light up together.
     
  4. MrCarlos

    Active Member

    Jan 2, 2010
    400
    134
    Hello teivel

    Apparently the matrix is damaged.
    When the Port A = 254 and Port B = 000, turn ON the rows 0, 5, 6, 7.
    When the Port A = 127 and Port B = 000, turn ON the rows 0, 5, 6, 7.
    Then rows 5, 6 and 7 never go out ?

    You can do an experiment:
    Port A = 000
    Port B = 254
    Then:
    Port A = 000
    Port B = 127

    Notify what happens to the LED matrix please.
     
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