- Mon Jan 24, 2011 8:18 pm
#118335
I need to use an SD card shield with a Pro 5V board. I was under the impression that the Pro 5V had the same pinouts as the Arduino Uno, but I was mistaken. It appears that the pin on the Pro that matches up to the pin on the Uno that puts out 3.3V actually puts out 5V.
What's the best way to reduce 5V down to 3.3V? I'm thinking resistor, but I'd need to know the exact current draw of the SD shield to calculate that. I thought of going with a 3.3V board, but that would be even more work considering I need 5V discrete logic out and have 5V going in from another circuit.
Thanks
What's the best way to reduce 5V down to 3.3V? I'm thinking resistor, but I'd need to know the exact current draw of the SD shield to calculate that. I thought of going with a 3.3V board, but that would be even more work considering I need 5V discrete logic out and have 5V going in from another circuit.
Thanks