Table LED Matrix, Weeks of debugging, column problems


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  1. #17
    Join Date
    Sep 2007
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    Im concered that the LED clusters are not as bright as when I tested them individually, and they are barely shining through the diffusive glass I have over them.

    Kevin suggested to change the program to not run pulses. Is anyone familiar enough with this to help me?

    Here are some measurements:

    Voltage:

    1) From PSU Ground to a single LED Cluster (6 LED's in parallel with a resistor) COLUMN input: 5.25 V

    2) From PSU Ground to single LED Cluster (6 LED's in parallel with a resistor) LED Cluster ROW input: 3.85 V

    3) From ROW input to COLUMN input of a single cluster: .86V (I dont think this means anything, since this is an incorrect way to measure V)

    Current:

    4) Removing one LED cluster in the all lit column and connecting column output of LED below and column input of LED above to the meter: 2.53 using 20mA setting/resolution

    5) Removing one LED cluster in the all lit row and connecting row ouput of LED to the left and row input of LED to the right to the meter: 12.17 using 20mA setting/resolution
    Last edited by mekohler; - 2nd December 2007 at 02:47.

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