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/***
EEPROM Update method
Stores values read from analog input 0 into the EEPROM.
These values will stay in the EEPROM when the board is
turned off and may be retrieved later by another sketch.
If a value has not changed in the EEPROM, it is not overwritten
which would reduce the life span of the EEPROM unnecessarily.
Released using MIT licence.
***/
#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(){ /** EMpty setup **/ }
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;
/***
Update the particular EEPROM cell.
these values will remain there when the board is
turned off.
***/
EEPROM.update(addr, val);
/***
The function EEPROM.update(addr, val) is equivalent to the following:
if( EEPROM.read(addr) != val ){
EEPROM.write(addr, val);
}
***/
/** advance to the next address. there are 512 bytes in the EEPROM, so go back to 0 when we hit 512. **/
addr = addr + 1;
if (addr == 512)
addr = 0;
delay(100);
}
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