#include "HX711.h"
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);
#define SOUND_SPEED 0.034
long duration;
float distanceCm;
float distanceInch;
const int trigPin = 18;
const int echoPin = 5;
// HX711 circuit wiring
const int LOADCELL_DOUT_PIN = 23;
const int LOADCELL_SCK_PIN = 19;
HX711 scale;
void setup() {
Serial.begin(57600);
scale.begin(LOADCELL_DOUT_PIN, LOADCELL_SCK_PIN);
pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output
pinMode(echoPin, INPUT);
if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
Serial.println(F("SSD1306 allocation failed"));
for(;;);
}
delay(500);
display.clearDisplay();
display.setTextSize(1.2);
display.setTextColor(WHITE);
}
void loop() {
long reading;
if (scale.is_ready()) {
reading = scale.read();
} else {
Serial.println("HX711 not found.");
}
int berat = map(reading,0,21000,0,200);
Serial.print("Berat: ");
Serial.print(berat);
Serial.println("Kg");
digitalWrite(trigPin, LOW);
delayMicroseconds(2);
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);
duration = pulseIn(echoPin, HIGH);
distanceCm = duration * SOUND_SPEED/2;
Serial.print("Distance (cm): ");
Serial.println(distanceCm);
display.clearDisplay();
display.setCursor(0, 5);
display.print("Tinggi :");
display.print(distanceCm);
display.print(" cm");
//display.display();
display.setCursor(0, 20);
display.print("Berat :");
display.print(berat);
display.print(" kg");
display.display();
double bmi = berat / ((distanceCm / 100.00) * (distanceCm / 100.00));
display.setCursor(0, 35);
display.print("BMI :");
display.print(bmi);
display.display();
display.setCursor(0, 50);
display.print("Class :");
if(bmi < 18.5){
display.print("Underweight");
}
else if(bmi >= 18.5 && bmi <= 24.9){
display.print("Normal");
}
else if(bmi >= 25.0 && bmi <= 29.9){
display.print("Overweight");
}
else if(bmi >= 30.0 && bmi <= 34.9){
display.print("Obesity 1");
}
else if(bmi >= 35.0 && bmi <= 39.9){
display.print("Obesity 2");
}
else if(bmi >= 40.0){
display.print("Obesity 3");
}
display.display();
delay(1000);
}