#include <stdio.h>
#include <unistd.h>

// Define the pins for the load cell
#define LOADCELL_DOUT_PIN 16
#define LOADCELL_SCK_PIN 4

// Define the HX711 struct
typedef struct {
    int dout_pin;
    int sck_pin;
    float calibration_factor; // Changed to float for more precision in calibration factor
} HX711;

HX711 loadcell; // Declare loadcell globally

// Define calibration parameters
#define MAX_WEIGHT_KG 50
#define SENSITIVITY_G_PER_V 1
#define MAX_VOLTAGE_OUTPUT_V 5

// Calculate maximum weight in grams
#define MAX_WEIGHT_G (MAX_WEIGHT_KG * 1000)

// Calculate maximum weight in grams based on sensitivity and voltage output
#define MAX_WEIGHT_WITH_SENSITIVITY_G (SENSITIVITY_G_PER_V * MAX_VOLTAGE_OUTPUT_V)

// Calculate calibration factor
#define CALIBRATION_FACTOR ((MAX_WEIGHT_G / MAX_WEIGHT_WITH_SENSITIVITY_G) / 1024) // Assuming 10-bit ADC

// Function to initialize the load cell
void hx711_begin() {
    loadcell.calibration_factor = CALIBRATION_FACTOR;
    // Add initialization code for load cell pins if needed
}

// Function to set the gain of the load cell
void hx711_set_gain(int gain) {
    // Implement setting gain
}

// Function to set the offset (calibration factor) of the load cell
void hx711_set_offset(float offset) {
    loadcell.calibration_factor = 100000;
}

// Function to read raw data from the load cell
long hx711_get_value() {
    // Implement reading raw data from load cell
    return 500000; // Placeholder return value
}

// Function to convert raw data to weight
float hx711_get_weight() {
    long reading = hx711_get_value();
    return (float)reading / loadcell.calibration_factor; // Adjusted to use calibration factor
}

void setup() {
    // Initialize serial communication
    printf("Serial communication initialized\n");

    // Configure pins for load cell
    // Add initialization code for load cell pins if needed

    // Initialize load cell
    hx711_begin();

    // Set gain and calibration factor
    hx711_set_gain(64); // Set the gain (128 or 64)
    hx711_set_offset(loadcell.calibration_factor); // Set the calibration factor
}

void loop() {
    // Continuous loop for reading weight
    while (1) {
        long reading = hx711_get_value(); // Read the raw data from the load cell
        float weight = hx711_get_weight(); // Convert raw data to weight
        printf("Raw reading: %ld\n", reading);
        printf("Weight: %.2f kg\n", weight); // Display weight in grams
        printf("----------------------\n");

        sleep(1); // Delay between readings (1 second)
    }
}

int main() {
    setup(); // Call setup once before entering the loop

    // Enter the loop
    while (1) {
        loop(); // Call loop continuously
    }

    return 0;
}