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1  Forum 2005-2010 (read only) / Exhibition / Re: SD card read/write with Arduino on: January 20, 2011, 04:10:53 pm
Hello everyone,

I'm new to the forum so I'd like to first say hi to everyone.

I recently began experimenting with wiring to the SD card on a breadboard and I had a thought. Why not connect the ground pins on the SD card to a 1.7v supply and use the 5V line for VCC? This way the card will see a 3.3V supply and see 3.3 level signals from the arduino.

I tried this and it seemed to work out fine. When I initially used the voltage dividers (since I didn't have the buffer IC), I started to get bad data after a certain speed because of the resistor delay. This was eliminated when I used the 1.7v supply. I am able to write 6 channels of analog data at 200 Hz. I haven't tried anything faster yet.

My question is does anyone think this is damaging the SD card? I've already ordered the buffer ICs but if this method works fine over a long time then I won't use them.

2  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Open Source Data Logger Project Using the Arduino? on: November 02, 2009, 05:35:20 pm

I am new to this forum and found this thread while searching for a way to build a data logger. I am very interested in building a data logger out of an arduino board but I am unsure if it is fast enough for the application.

I will be using it to sample and log GPS, accelerometer, and analog data from sensors on a race car. It will have to be able to log these at 5Hz minimum (10Hz prefered). And also possibly have an RS232 serial interface to log serial data from the engine control unit.

Do you that this is possible? Any help would be appreciated.

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