#include <HX711.h>

// Pin definitions
const int loadCellDoutPin =  2;
const int loadCellSckPin =  3;
const int ledPin = 9; // LED connected to pin 9

// Create HX711 object
HX711 scale;

// Calibration factor (change this as needed)
float calibrationFactor = 1100; // Adjust this value for accurate readings

void setup() {
  Serial.begin(9600);
    scale.begin(loadCellDoutPin, loadCellSckPin);
      
        pinMode(ledPin, OUTPUT); // Set LED pin as output
          
            Serial.println("HX711 Calibration");
              Serial.println("Place a known weight on the load cell and press Enter.");
                while (!Serial.available()) {
                    // Wait for user to press Enter
                      }
                        Serial.read(); // Clear the buffer
                          
                            // Tare the scale
                              scale.tare();
                                Serial.println("Scale is tared. Please place the known weight on the load cell.");
                                  
                                    delay(2000); // Wait for a bit
                                      
                                        long reading = scale.get_units(10); // Average of 10 readings
                                          Serial.print("Reading with weight: ");
                                            Serial.println(reading);
                                              
                                                Serial.print("Enter the calibration factor: ");
                                                  while (!Serial.available()) {
                                                      // Wait for user input
                                                        }
                                                          calibrationFactor = Serial.parseFloat();
                                                            Serial.println("Calibration factor set.");
                                                              
                                                                scale.set_scale(calibrationFactor); // Set the calibration factor
                                                                  scale.tare(); // Reset the scale to 0
                                                                    
                                                                      Serial.println("Calibration complete. You can now use the scale.");
                                                                      }

                                                                      void loop() {
                                                                        float weight = scale.get_units();
                                                                          
                                                                            // Map the weight to a PWM value (0-255)
                                                                              int pwmValue = map(weight, 0, 1000, 0, 255); // Adjust the range as needed
                                                                                
                                                                                  // Ensure PWM value is within bounds
                                                                                    pwmValue = constrain(pwmValue, 0, 255);
                                                                                      
                                                                                        analogWrite(ledPin, pwmValue); // Set LED brightness
                                                                                          
                                                                                            Serial.print("Weight: ");
                                                                                              Serial.print(weight, 2); // Print weight in grams
                                                                                                Serial.print(" g, LED Brightness: ");
                                                                                                  Serial.println(pwmValue);
                                                                                                    
                                                                                                      delay(1000);
                                                                                                      }