Black & Decker RC880 Manuel d'utilisateur télécharger pdf (Page 22)

Persistent Data

So you don't have to hard-code the tuning parameters or enter them every time you use the

controller, we save them in the Arduino's EEPROM. This makes the code a little more elegant

as you can program the controller once, then re-tune if you ever change cookers but

whenever you turn on your controller, it will remember the settings from the last time you

used it.

SInce EEPROM can only be written a finite number of times (typically 100,000), we compare

the contents before writing and only write if something has changed. This functionality is

implemented in the following helper functions:

// ************************************************

// Save any parameter changes to EEPROM

// ************************************************

void SaveParameters()

{

if (Setpoint != EEPROM_readDouble(SpAddress))

{

EEPROM_writeDouble(SpAddress, Setpoint);

}

if (Kp != EEPROM_readDouble(KpAddress))

{

EEPROM_writeDouble(KpAddress, Kp);

}

if (Ki != EEPROM_readDouble(KiAddress))

{

EEPROM_writeDouble(KiAddress, Ki);

}

if (Kd != EEPROM_readDouble(KdAddress))

{

EEPROM_writeDouble(KdAddress, Kd);

}

// ************************************************

// Load parameters from EEPROM

// ************************************************

void LoadParameters()

{

// Load from EEPROM

Setpoint = EEPROM_readDouble(SpAddress);

Kp = EEPROM_readDouble(KpAddress);

Ki = EEPROM_readDouble(KiAddress);

Kd = EEPROM_readDouble(KdAddress);

// Use defaults if EEPROM values are invalid

if (isnan(Setpoint))

{

Setpoint = 60;

}

if (isnan(Kp))

https://learn.adafruit.com/sous-vide-powered-by-arduino-the-sous-

viduino

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Black & Decker RC880 Manuel d'utilisateur Page 22

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