Mr_arduino:
I think the 74HC245 would work just fine also a unidirectional one would work too. Pretty much any buffer that is fast enough to handle a 16mhz signal and can accept 3.3v as a supply voltage which the 74HC245 can. ... Only the clock signal needs to go though the buffer as that is an input and the sd card if you are using it. From twi just disable internal pullup resistors and have them to 3.3v instead of 5v...
Hello, I'm trying too to get the ov7670 communicate with Arduino UNO.
I read this post a week ago, I bought some 74HC245 but I realized they are not fully bidirectional, you have to choose the direction using a pin. So they can't be used with SIO_D and SIO_C, as far as I know. As I'm reading this post again, I guess A5 and A4 pins, using the code supplied, will output 3.3V instead of 5V (assuming internal pullup is OFF). Am I right?