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.
Thanks