Hi there, I have the previous version of the RTC/SD data logger shield that has been working fine until recently. I received an error that the SD card wouldn't initialize or wasn't present. I checked the original SD card on PC and MAC and it still had previous log files from other tests, but a different card, re-seating the original card or formatting it made no difference. On the example CardInfo Sketch I get the error "initialization failed" (chip select set to pin 10). I started checking for possible mistakes I had made when I noticed that Pin 11 no longer outputs high or low with the shield in place, using a LED, resistor and the blink sketch, although it is fine when the shield is removed. The other thing I checked was the voltage at the card pins 4 & 5 is 3.3VDC
The RTC side of things works fine, and if I comment out the section where it initializes the SD card my sketch will run, but not log.
I am not sure how I could test the 74AHC125N, as all the other components seem to indicate fine.
I hope that the Pin 11 thing might give you a clue
BTW this is the SMD Uno and the older version of the RTC SD logger shield
Any thoughts will be appreciated.