Here is a topic with a sample of creating an sd card reader node, which describes how to write it and how to make it.Before the last message, Mr. @xodballxod dropped a file with a node reading a line with a file. In order for it to start working correctly, as I understand it, you need to change the line in its “not-implemented-in-xod”: (File file = sd.open(filename, O_WRITE…) as follows: File myFile = SD.open(filename, O_READ);. Unfortunately I don’t have an sd card to check.