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Topic: SD card won't initialize, Voltage increases after card is connected (Read 1 time) previous topic - next topic

nkaati

I can't seem to figure out why my SD card won't initialize.  I checking the voltage and after the SD card is connected the voltage rises from 3.3 to 3.6V and then 500ms later jumps to 3.9V.
I'm using the 3.3V pin from the Arduino Duemilanove.  Is this normal that the voltage would increase after plugging in the SD card.  I don't think the pins I'm using for the SPI connection are incorrect.

Thanks,
Nathan

CrossRoads

The 3.3V pin only puts out 50mA from the FTDI USB chip; you are overstressing it, and may notice it getting hot. You will need another source that can supply more current.
My card here has a regulator just to provide current to the SD card.
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nkaati

Even using an alternative source I'm still getting an increase in voltage after plugging in the sd card.
it jumps from 3.3V to 3.5V and the supply is 100mA.

Still doesn't recognize the sd card

PaulS

Time to post a schematic showing how the SD card is wired.

nkaati

Here is a picture of the pin connections, I only changed the CS pin from 4 to 10 compared to the examples. All the jumpers are on DIS(abled).

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