Quantcast
Channel: fritzing forum - Latest posts
Viewing all articles
Browse latest Browse all 29651

Does an Arduino Uno Mega Shield SD Card ICSP SPI Exists Already?

$
0
0

The different pin numbers on the socket confused me. miso (DO on the socket) shouldn’t be level translated and is in the wrong direction. DO is the data back to the micro and will make this not work. VCC needs to be 3.3V and the IC a 74ahc125 and pin 12 of the 74ahc125 needs to be grounded (as it is unused and cmos doesn’t like floating input pins). This site has a wiring diagram for an SD interface. Here the 74ahc125 is the level shifter in the schematic.

edit: (forgot to actually add the url …)

https://openlabpro.com/guide/interfacing-microcontrollers-with-sd-card/

edit2: the shield pins likely all want to be grounded as well. It may work ok without that but grounded is better.

Peter


Viewing all articles
Browse latest Browse all 29651

Trending Articles



<script src="https://jsc.adskeeper.com/r/s/rssing.com.1596347.js" async> </script>