Testing Array and Signal Condenser

Discussion in 'Analog & Mixed-Signal Design' started by RobertP, Nov 14, 2017.

  1. RobertP

    Thread Starter New Member

    Nov 14, 2017
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    0
    Hi All,
    I'm making a burn-in chamber fixture that will be able to test an array of LEDs. The array is 6x6. I have a current sensing IC that will output a signal when the correct current is being applied to an LED. If I have an IC for each LED than that's 36 different signals. I want to send these signals to a microcontroller or fpga or something and from there the processor will output to a LED array of red or green colors. This smaller array Indicates which specific LED in the Testing array is not receiving enough current. My question is how do I condense the 36 signals down to a more manageable address of signals? Or is there even a better way to do this? If you need more info Id be happy to give some.
     
  2. MrChips

    Moderator

    Oct 2, 2009
    14,718
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    You can serialise the data and send it as one data stream using any number of serial transmission techniques such as bit-banging, shift register output, UART, SPI, SCI, I2C., 1-wire, UART-to-USB. You can do this with one or two signal wires plus ground.

    If the data is binary per LED, i.e. ON/OFF, all you would need is five or more bytes to transmit, one bit for each LED.
     
  3. AnalogKid

    AAC Fanatic!

    Aug 1, 2013
    5,727
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    To be clear, is this a digital signal, strictly on/off, high/low, good/bad? Or an analog signal that is proportional to the LED current?

    ak
     
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