trunk/Arduino/libraries/SD/examples/Datalogger/Datalogger.ino

@@ -2,18 +2,21 @@
   SD card datalogger
 
   This example shows how to log data from three analog sensors
-  to an SD card using the SD library.
+  to an SD card using the SD library. Pin numbers reflect the default
+  SPI pins for Uno and Nano models
 
   The circuit:
-   analog sensors on analog ins 0, 1, and 2
+   analog sensors on analog pins 0, 1, and 2
    SD card attached to SPI bus as follows:
- ** MOSI - pin 11
- ** MISO - pin 12
+ ** SDO - pin 11
+ ** SDI - pin 12
  ** CLK - pin 13
- ** CS - pin 4 (for MKRZero SD: SDCARD_SS_PIN)
+ ** CS - depends on your SD card shield or module.
+ 		Pin 10 used here for consistency with other Arduino examples
+    (for MKR Zero SD: SDCARD_SS_PIN)
 
   created  24 Nov 2010
-  modified 9 Apr 2012
+  modified  24 July 2020
   by Tom Igoe
 
   This example code is in the public domain.
@@ -23,25 +26,26 @@
 #include <SPI.h>
 #include <SD.h>
 
-const int chipSelect = 4;
+const int chipSelect = 10;
 
 void setup() {
   // Open serial communications and wait for port to open:
   Serial.begin(9600);
-  while (!Serial) {
-    ; // wait for serial port to connect. Needed for native USB port only
-  }
-
+  // wait for Serial Monitor to connect. Needed for native USB port boards only:
+  while (!Serial);
 
   Serial.print("Initializing SD card...");
 
-  // see if the card is present and can be initialized:
   if (!SD.begin(chipSelect)) {
-    Serial.println("Card failed, or not present");
-    // don't do anything more:
-    while (1);
+    Serial.println("initialization failed. Things to check:");
+    Serial.println("1. is a card inserted?");
+    Serial.println("2. is your wiring correct?");
+    Serial.println("3. did you change the chipSelect pin to match your shield or module?");
+    Serial.println("Note: press reset button on the board and reopen this Serial Monitor after fixing your issue!");
+    while (true);
   }
-  Serial.println("card initialized.");
+
+  Serial.println("initialization done.");
 }
 
 void loop() {
@@ -73,12 +77,3 @@ void loop() {
     Serial.println("error opening datalog.txt");
   }
 }
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