Used to test EEPROM and also reset stored values

arduino/eeprom_read_write_reset.ino

@@ -0,0 +1,70 @@
+/*
+ * EEPROM Write
+ *
+ * Stores values into the EEPROM.
+ * These values will stay in the EEPROM when the board is
+ * turned off and may be retrieved later by another sketch.
+ * 
+ * Writes 8 values.
+ * 
+ */
+
+#include <EEPROM.h>
+
+/** the current address in the EEPROM (i.e. which byte we're going to write to next) **/
+int addr = 0;
+
+void setup() {
+  // initialize serial
+  Serial.begin(9600);
+}
+
+void loop() {
+  /***
+    Need to divide by 4 because analog inputs range from
+    0 to 1023 and each byte of the EEPROM can only hold a
+    value from 0 to 255.
+  ***/
+
+ // int val = analogRead(0) / 4;
+
+  /***
+    Write the value to the appropriate byte of the EEPROM.
+    these values will remain there when the board is
+    turned off.
+  ***/
+
+  Serial.println("\nEEPROM Write/Read test and Reset\n\n");
+  for (int i=0; i < 9; i++)
+  {
+    EEPROM.write(i,i);
+    delay(500);
+    Serial.println(EEPROM.read(i));
+  }
+
+   /***
+    Advance to the next address, when at the end restart at the beginning.
+
+    Larger AVR processors have larger EEPROM sizes, E.g:
+    - Arduno Duemilanove: 512b EEPROM storage.
+    - Arduino Uno:        1kb EEPROM storage.
+    - Arduino Mega:       4kb EEPROM storage.
+
+    Rather than hard-coding the length, you should use the pre-provided length function.
+    This will make your code portable to all AVR processors.
+  ***/
+//  addr = addr + 1;
+//  if (addr == EEPROM.length()) {
+//    addr = 0;
+//  }
+
+  /***
+    As the EEPROM sizes are powers of two, wrapping (preventing overflow) of an
+    EEPROM address is also doable by a bitwise and of the length - 1.
+
+    ++addr &= EEPROM.length() - 1;
+  ***/
+
+
+//  delay(100);
+}