LDR measurement help



  • I'm using an LDR and when i put my finger over it (complete darkness)
    i get this odd "wave like" reading over and over.
    you can see that happen and then when i take my finger off, the value starts to climb steadily but with no "wave like"
    readings going on.

    so my question is what is going on and how do i resolve it?

    0
    0
    0
    0
    0
    7
    16
    28
    7
    34
    64
    84
    100
    100
    100
    100
    100
    100
    100
    96
    83
    66
    44
    20
    4
    0
    0
    0
    0
    0
    0
    0
    0
    2
    12
    25
    39
    54
    69
    84
    97
    100
    100
    100
    100
    100
    100
    100
    98
    86
    68
    48
    26
    7
    0
    0
    0
    0
    0
    0
    0
    0
    0
    0
    0
    3
    12
    27
    47
    69
    90
    100
    100
    100
    100
    100
    100
    100
    100
    88
    66
    51
    32
    17
    2
    0
    0
    0
    0
    0
    0
    0
    0
    2
    10
    23
    40
    53
    73
    88
    100
    100
    100
    100
    100
    100
    100
    100
    100
    95
    83
    71
    57
    43
    28
    13
    0
    0
    0
    0
    0
    0
    0
    0
    0
    0
    2
    16
    35
    56
    72
    86
    100
    100
    100
    100
    100
    100
    100
    100
    93
    76
    65
    50
    36
    19
    6
    0
    0
    0
    0
    0
    0
    0
    0
    0
    0
    0
    8
    22
    35
    52
    68
    85
    100
    100
    100
    100
    100
    100
    100
    100
    92
    79
    66
    52
    33
    17
    2
    0
    0
    0
    0
    0
    0
    0
    0
    0
    0
    0
    0
    0
    0
    0
    0
    3
    10
    14
    22
    27
    27
    24
    12
    5
    7
    13
    12
    16
    19
    18
    17
    15
    21
    26
    49
    73
    81
    86
    87
    89
    85
    74
    70
    64
    47
    46
    71
    60
    56
    56
    54
    59
    67
    
    

  • Hardware Contributor

    Vcc ripple?
    Cap in parallel to the ldr?



  • i'll give that a try... thx


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