Saving to EEPROM

[mfalkvidd]

@esawyja the relay example saves state. See if you can use that as template.

[esawyja]

Hi
I think the relay example get the previous state from the EEPROM, I need to get the state from the controller after it was set for the 1st time from the controller?

void before()
{
for (int sensor=1, pin=RELAY_1; sensor<=NUMBER_OF_RELAYS; sensor++, pin++) {
// Then set relay pins in output mode
pinMode(pin, OUTPUT);
// Set relay to last known state (using eeprom storage)
digitalWrite(pin, loadState(sensor)?RELAY_ON:RELAY_OFF);
}
}

An example with lots of comments that is being done will help a lot please

Regards

[BartE]

@esawyja for getting a value from the controller one can use "request()", i.e. in the relay example like this:

request(CHILD_ID,V_LIGHT);

The answer should be handled by the receive function

[esawyja]

Thanks all, I'll try to get this to work

[esawyja]

Hi
I'm struggling to get my head around this, when I do this

#define LowTempState 0
#define HighTempState 0
#define HeaterONOFF 0

Does this define the position in EEPROM, as per the documentation, so what I'm doing here is completely incorrect? What I need to do it to give it a value where to save with the #define statements?

The documentation states
void saveState(uint8_t pos, uint8_t value);

pos - The position to store value in (0-255)
value - Value to store in position

So if I do this
#define LowTempState 10 //Naming the position LowTempState at position 10 in EEPROM
#define HighTempState 20
#define HeaterONOFF 30
I have to save the values to the EEPROM addresses with
saveState(HighTempState, 40);
saveState(LowTempState, 30);
saveState(HeaterONOFF, 0);
So the above with save the values 40, 30 and 0 to their positions 10, 20 and 30 in EEPROM?

I have to read the state with
int temHighTrigger=loadState(HighTempState);
int temLowTrigger=loadState(LowTempState);
int HeaterStatus=loadState(HeaterONOFF);
So temHighTrigger will now contain 40? temLowTrigger will now contain 30 and the HeaterStatus will be 0?

Retrieving a state (from local EEPROM).
uint8_t loadState(uint8_t pos);

Sorry for all the questions, my head is spinning....

[AWI]

@esawyja You are correct with the your explanation. The EEPROM consists of 256 "byte" (8 bit) positions , best defined by the type uint_8_t. Be aware that an "int" (int8_t) type in the Arduino C++ compilers is 16 bits. So if you want to store a full int you need two EEPROM positions.

[esawyja]

Thanks @AWI
So for
#define LowTempState 10 //Naming the position LowTempState at position 10 in EEPROM
#define HighTempState 20
#define HeaterONOFF 30

I need to do something like this if it is possible?
#define LowTempState 10, 11 //Naming the position LowTempState at position 10 in EEPROM
#define HighTempState 20, 21
#define HeaterONOFF 30

Or do I just declare the trigger as 2 bytes with
uint_8_t temHighTrigger=loadState(HighTempState); //So this will read from position 10 for 16 bits?
uint_8_t temLowTrigger=loadState(LowTempState); //This one will start at 20 and read 21 as well?
int HeaterStatus=loadState(HeaterONOFF); //This one will read only position 30?

Regards

[AWI]

@esawyja you are getting a little too creative here. I suggest you stick to using uint8_t (byte) types for all of your variables unless you need more range than 0..255. If you need more you need to split these types (int, long, float,... ) into bytes yourself and handle them separately.
If you need suggestions there are a few easy ways to accomplish this by means of using 'union'. Just let us know here.

[esawyja]

Ok now I'm more confused, but thanks, I will figure it out

[AWI]

@esawyja sorry... Also for the first sentence? Use byte (uint8_t) for all variables you need to store..