non volatile memory

Forum 2005-2010 (read only) Software Syntax & Programs
1

I do not know exacly the rigth word but does it exist the way to store a number in arduino that I can read again when I switch on it again?
For example the hours of work of the unit.
thank you in advance
Pietro

2

Look at the playground for EEPROm and how to use it

3

I do love my small example fo setUp():

byte byte8ofEEPROM =EEPROM.read( 8);
EEPROM.write(8,byte8ofEEPROM+1);
while(byte8ofEEPROM&1);
4

There's a handy template for reading and writing any type from and to EEPROM, without having to worry about the type's size.

template <class T> int EEPROM_writeAnything(int ee, const T& value)
{
    const byte* p = (const byte*)(const void*)&value;
    int i(0);
    for (; i < sizeof(value); ++i)
        EEPROM.write(ee++, *p++);
    return i;
}


template <class T> int EEPROM_readAnything(int ee, T& value)
{
    byte* p = (byte*)(void*)&value;
    int i (0);
    for (; i < sizeof(value); ++i)
        *p++ = EEPROM.read(ee++);
    return i;
}