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	- Project: "Analog Storage"
	- Source Code compiled for: Arduino Uno
	- Source Code created on: 2023-12-29 10:49:05

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
	/* If pushbutton P1 is pressed, read the values of */
	/* AI1 and AI2 in float and save to EEPROM when */
	/* pushbutton P1 is OFF then stop reading values of */
	/* AI1 and AI2 and print on serial all saved EEPROM */
	/* values in float. */
/****** END SYSTEM REQUIREMENTS *****/

/****** DEFINITION OF LIBRARIES *****/
#include 
#include 
#include 
#include 

/****** FUNCTION PROTOTYPES *****/
void setup(void);
void loop(void);
void saveToEEPROM(float value, int address);
float readFromEEPROM(int address);

/***** DEFINITION OF DIGITAL INPUT PINS *****/
const uint8_t P1_PushButton_PIN_D2 = 2;

/***** DEFINITION OF ANALOG INPUT PINS *****/
const uint8_t AI1_Potentiometer_Vout_PIN_A1 = A1;
const uint8_t AI2_Potentiometer_Vout_PIN_A0 = A0;

/****** DEFINITION OF LIBRARIES CLASS INSTANCES*****/
DFRobot_ADS1115 ads(&Wire);

/****** DEFINITION OF EEPROM ADDRESSES *****/
const int AI1_EEPROM_ADDRESS = 0;
const int AI2_EEPROM_ADDRESS = 4;

/****** GLOBAL VARIABLES *****/
bool isSavingEnabled = false;

void setup(void)
{
    // put your setup code here, to run once:
    Serial.begin(115200);

    ads.setGain(eGAIN_TWOTHIRDS);
    ads.setMode(eMODE_SINGLE);
    ads.setRate(eRATE_128);
    ads.setOSMode(eOSMODE_SINGLE);
    ads.init();

    pinMode(P1_PushButton_PIN_D2, INPUT_PULLUP);
    pinMode(AI1_Potentiometer_Vout_PIN_A1, INPUT);
    pinMode(AI2_Potentiometer_Vout_PIN_A0, INPUT);
}

void loop(void)
{
    // Check if pushbutton P1 is pressed
    if (digitalRead(P1_PushButton_PIN_D2) == LOW)
    {
        isSavingEnabled = true;
        delay(10); // Debounce delay
    }
    else
    {
        isSavingEnabled = false;
    }

    if (isSavingEnabled)
    {
        // Read and save values from AI1 and AI2 to EEPROM
        float ai1Value = ads.readVoltage(AI1_Potentiometer_Vout_PIN_A1);
        saveToEEPROM(ai1Value, AI1_EEPROM_ADDRESS);

        float ai2Value = ads.readVoltage(AI2_Potentiometer_Vout_PIN_A0);
        saveToEEPROM(ai2Value, AI2_EEPROM_ADDRESS);
    }
    else
    {
        // Print all saved EEPROM values to serial
        float ai1SavedValue = readFromEEPROM(AI1_EEPROM_ADDRESS);
        float ai2SavedValue = readFromEEPROM(AI2_EEPROM_ADDRESS);

        Serial.print("AI1 Saved Value: ");
        Serial.println(ai1SavedValue);

        Serial.print("AI2 Saved Value: ");
        Serial.println(ai2SavedValue);
    }

    delay(1000);
}

void saveToEEPROM(float value, int address)
{
    // Convert float value to byte array representation
    byte* valueBytes = (byte*) &value;

    // Write each byte of the value to EEPROM
    for (int i = 0; i < sizeof(float); i++)
    {
        EEPROM.write(address + i, valueBytes[i]);
    }
}

float readFromEEPROM(int address)
{
    // Read each byte of the value from EEPROM
    byte valueBytes[sizeof(float)];
    for (int i = 0; i < sizeof(float); i++)
    {
        valueBytes[i] = EEPROM.read(address + i);
    }

    // Convert byte array back to float value
    float value = *((float*) valueBytes);

    return value;
}