LED Indicator on 3v3 SPI Bus

I have a 3v3 SPI bus with a SDcard on it. I would like to know visually when data is being written to the card. Are there any potential problems with adding a small (1206) SMD LED in parallel as an indicator?


the problems about your idea:

  • a SPI bus runs fast, so if you connect a LED to the data signals or chip select you will not see anything .. its to fast for your eye.
  • the led need some current, the spi pins have to drive the current for it.

a solution could be to use the chip select signal with a transistor to trigger a pulse element with drive a led for a short time.

Category: led Time: 2016-07-28 Views: 1
Tags: led spi

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