**Analog Communication** rev_02

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    - Project: **Analog Communication**
    - Source Code NOT compiled for: Arduino Pro Mini 5V
    - Source Code created on: 2025-02-10 21:59:45

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
    /* Check if digital data is received from bluetooth */
    /* and and use this data into MCP4725. */
/****** SYSTEM REQUIREMENT 2 *****/
    /* Read currentAcquisition and send it via bluetooth. */
    /* The data to be send has to be integer. */
/****** END SYSTEM REQUIREMENTS *****/

/* START CODE */

/****** DEFINITION OF LIBRARIES *****/
#include <SoftwareSerial.h>
#include <Wire.h>
#include <Adafruit_MCP4725.h>   //https://github.com/adafruit/Adafruit_MCP4725

/****** FUNCTION PROTOTYPES *****/
void setup(void);
void loop(void);
void updateInputs();
void convertInputsFromRawToPhyData();
void sendDataViaBluetooth(int data);
void receiveDataFromBluetooth();

/***** DEFINITION OF ANALOG INPUT PINS *****/
const uint8_t currentAcquisition_PIN_A0     = A0;

/***** DEFINITION OF Software Serial *****/
const uint8_t DX_BT27_Slave_HC05_mySerial_PIN_SERIAL_TX_A1      = A1;
const uint8_t DX_BT27_Slave_HC05_mySerial_PIN_SERIAL_RX_A2      = A2;
SoftwareSerial DX_BT27_Slave_HC05_mySerial(DX_BT27_Slave_HC05_mySerial_PIN_SERIAL_RX_A2, DX_BT27_Slave_HC05_mySerial_PIN_SERIAL_TX_A1);

/***** DEFINITION OF I2C PINS *****/
const uint8_t MCP4725_PIN_SDA_A4        = A4;
const uint8_t MCP4725_PIN_SCL_A5        = A5;

/****** DEFINITION OF ANALOG INPUTS CHARACTERISTIC CURVES *****/
const uint8_t SEGMENT_POINTS_voltage_Current_PIN_A0 = 2;
const float voltage_Current_PIN_A0_lookup[2][SEGMENT_POINTS_voltage_Current_PIN_A0] =
{
    {0.0    ,   5.0},   //Voltage [V]
    {0.0    ,   500.0}  //Current [A]
};

/***** DEFINITION OF INPUT RAW VARIABLES *****/
unsigned int    currentAcquisition_PIN_A0_rawData       = 0; // Analog Input

/***** DEFINITION OF INPUT PHYSICAL VARIABLES *****/
float   currentAcquisition_PIN_A0_phyData       = 0.0; // Current [A]

/****** DEFINITION OF LIBRARIES CLASS INSTANCES*****/
// Instantiate the MCP4725 object
Adafruit_MCP4725 mcp;

void setup(void)
{
    // put your setup code here, to run once:
    pinMode(currentAcquisition_PIN_A0, INPUT);
    DX_BT27_Slave_HC05_mySerial.begin(9600);
    mcp.begin(MCP4725_I2CADDR_DEFAULT); // Initialize the MCP4725
}

void loop(void)
{
    // put your main code here, to run repeatedly:
    updateInputs(); // Refresh input data
    convertInputsFromRawToPhyData(); // Transform raw data to physical data

    // Send current acquisition data via Bluetooth
    sendDataViaBluetooth((int)currentAcquisition_PIN_A0_phyData);

    // Check for incoming data from Bluetooth
    receiveDataFromBluetooth();
}

void updateInputs()
{
    currentAcquisition_PIN_A0_rawData = analogRead(currentAcquisition_PIN_A0);
}

void convertInputsFromRawToPhyData()
{
    float voltage = 0.0;
    voltage = currentAcquisition_PIN_A0_rawData * (5.0 / 1023.0);
    currentAcquisition_PIN_A0_phyData = lookup_phyData_from_voltage(voltage, SEGMENT_POINTS_voltage_Current_PIN_A0, &(voltage_Current_PIN_A0_lookup[0][0]));

    // Set the voltage on the MCP4725
    mcp.setVoltage((uint16_t)(currentAcquisition_PIN_A0_phyData * 4095.0 / 500.0), false); // Scale to 12-bit value
}

void sendDataViaBluetooth(int data)
{
    DX_BT27_Slave_HC05_mySerial.println(data); // Send data as integer via Bluetooth
}

void receiveDataFromBluetooth()
{
    if (DX_BT27_Slave_HC05_mySerial.available()) {
        String command = DX_BT27_Slave_HC05_mySerial.readStringUntil('\n'); // Read incoming command
        // Process the command as needed
        // For example, you could set the MCP4725 voltage based on a received command
    }
}

/* BLOCK lookup_phyData_from_voltage */
float lookup_phyData_from_voltage(float voltage, int segment_points, const float* voltage_phyData_lookup)
{
    // Search table for appropriate value.
    uint8_t index = 0;

    const float *voltagePointer = &voltage_phyData_lookup[0];
    const float *phyDataPointer = &voltage_phyData_lookup[segment_points];

    // Perform minimum and maximum voltage saturation based on characteristic curve
    voltage = min(voltage, voltagePointer[segment_points-1]);
    voltage = max(voltage, voltagePointer[0]);

    while( voltagePointer[index] <= voltage && index < segment_points )
        index++;

    // If index is zero, physical value is smaller than our table range
    if( index==0 )
    {
        return map_f( voltage,
            voltagePointer[0],   // X1
            voltagePointer[1],   // X2
            phyDataPointer[0],   // Y1
            phyDataPointer[1] ); // Y2
    }
    // If index is maxed out, phyisical value is larger than our range.
    else if( index==segment_points )
    {
        return map_f( voltage,
            voltagePointer[segment_points-2],   // X1
            voltagePointer[segment_points-1],   // X2
            phyDataPointer[segment_points-2],   // Y1
            phyDataPointer[segment_points-1] ); // Y2
    }
    // index is between 0 and max, just right
    else
    {
        return map_f( voltage,
            voltagePointer[index-1], // X1
            voltagePointer[index],    // X2
            phyDataPointer[index-1], // Y1
            phyDataPointer[index] );  // Y2
    }
}
/* END BLOCK lookup_phyData_from_voltage */

/* BLOCK map_f */
float map_f(float x, float in_min, float in_max, float out_min, float out_max)
{
    return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
}
/* END BLOCK map_f */

/* END CODE */