Create sdcardtest.ino

Code from the old repo

SD_Card_Testing_Jig/sdcardtest/sdcardtest.ino

@@ -0,0 +1,61 @@
+/*
+  SD card breakout tester!
+  Uses fat16lib's fantastic FAT library
+  tests:
+  1. CD pin works (goes low when card inserted)
+  2. 3.3V LDO output is in proper range
+  3. Can communicate with card
+ */
+
+#include <SD.h>
+
+Sd2Card card;
+
+#define CD 15 // A1 (D15) -> CardDetect
+#define LDO 0 // analog 0
+
+void setup()   {                
+  // initialize the digital pin as an output:
+  Serial.begin(9600);
+  
+  digitalWrite(CD, HIGH); // pull up on CD
+}
+
+
+void loop()                     
+{
+  Serial.println("waiting for SD card detect");
+ 
+  while (digitalRead(CD)) {
+   Serial.print('.');
+   delay(100);
+  }
+   
+  Serial.println("Detected Card!");
+ 
+  // first check 3.3V regulator
+  int a = analogRead(LDO);
+  if ((a > 710) || (a < 650)) {
+    // LDO not in the right range
+    Serial.println(a);
+    return;
+  }
+  
+  Serial.println("3.3V LDO ok");
+  
+  // try to talk to the card
+  uint8_t r = card.init(1);
+  if (!r) {
+    // failed to talk to SD card :(
+    Serial.println(r, DEC);
+    return;
+  }
+  
+  Serial.println("Card interface ok");
+  
+  // beep to indicate all is good
+  tone(9, 4000, 500);
+  
+  delay(1000);
+ 
+}