I have an Arduino Ethernet Shield W5500 Development Board which has a slot for a SD card. I insert a Micro SD card into the slot (FAT32 formatted) and try executing a sketch because Arduino should execute the HTML file on the webserver … <\/p>\n\n\n\n
\/\/ initialize SD card\nSerial.println(\"Initializing SD card...\");\nif (!SD.begin(4)) {\n Serial.println(\"ERROR - SD card initialization failed!\");\n return; \/\/ init failed\n}\nSerial.println(\"SUCCESS - SD card initialized.\");\n\/\/ check for index.htm file\nif (!SD.exists(\"index.htm\")) {\n Serial.println(\"ERROR - Can't find index.htm file!\");\n return; \/\/ can't find index file<\/code><\/code><\/pre>\n\n\n\nThe “index.htm” file is there. So I am quite astonished that the serial monitor complains about a missing file.<\/p>\n\n\n\n
I have a SD card module at hand and execute a sketch writing some lines in a testfile …<\/p>\n\n\n\n
Serial.print(\"Writing to test.txt\u2026\");\nmyFile.println(\"This is a test file :)\");\nmyFile.println(\"testing 1, 2, 3.\");\nfor (int i = 0; i < 20; i++) {\nmyFile.println(i);\n}\n\/\/ close the file:\nmyFile.close();\nSerial.println(\"done.\");<\/code><\/pre>\n\n\n\n Now I can see in the serial monitor that there is NO error message that the “index.htm” file is not there. And I am quite surprised that the C++ sketch has written the text into the “index.htm” file and saved it as “INDEX.HTM”.<\/p>\n\n\n\n
Seems to be a matter of fact that Arduino, when accessing a Micro SD card (FAT32) , expects the filename in upper cases and ignores filenames with lower case letters.<\/p>\n","protected":false},"excerpt":{"rendered":"
I have an Arduino Ethernet Shield W5500 Development Board which has a slot for a SD card. I insert a Micro SD card into the slot (FAT32 formatted) and try executing a sketch because Arduino should execute the HTML file on the webserver … The “index.htm” file is there. So I am quite astonished that … Continue reading “Arduino SD card access”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[129,87],"tags":[149,150,147,148],"_links":{"self":[{"href":"https:\/\/fakler.es\/it\/wp-json\/wp\/v2\/posts\/322"}],"collection":[{"href":"https:\/\/fakler.es\/it\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fakler.es\/it\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fakler.es\/it\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fakler.es\/it\/wp-json\/wp\/v2\/comments?post=322"}],"version-history":[{"count":6,"href":"https:\/\/fakler.es\/it\/wp-json\/wp\/v2\/posts\/322\/revisions"}],"predecessor-version":[{"id":328,"href":"https:\/\/fakler.es\/it\/wp-json\/wp\/v2\/posts\/322\/revisions\/328"}],"wp:attachment":[{"href":"https:\/\/fakler.es\/it\/wp-json\/wp\/v2\/media?parent=322"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fakler.es\/it\/wp-json\/wp\/v2\/categories?post=322"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fakler.es\/it\/wp-json\/wp\/v2\/tags?post=322"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}