Membuat Timbangan Digital (Digital Weight Scale) Menggunakan HX711 dan ARDUINO serta Interface Visual Basic 6.0 (VB 6)

Membuat Timbangan Digital (Digital Weight Scale) Menggunakan HX711 dan ARDUINO serta Interface Visual Basic 6.0 (VB 6)

            Pada kesempatan ini saya akan menjelaskan mengenai bagaimana cara membuat sebuah alat yang bisa digunakan untuk mengukur berat atau massa suatu benda, selain mengukur berat atau massa alat ini juga bisa menampilkan nilai tersebut ke komputer dengan software Visual Basic 6 (VB 6). alat ini menggunakan Arduino Uno sebagai kontrollernya dan juga ampli yang digunakan adalah HX711, untuk tampilan ke user menggunakan LCD 16x2. loadcell yang digunakan maks 3kg. untuk lebih jelasnya berikut adalah skema dan programnya.

a. Arduino Uno

b. Modul HX711 + Loadcell 3kg

c. LCD 16x2

d. Program Arduino IDE

//library HX711 bisa di download di link berikut
//https://github.com/bogde/HX711

#include <Wire.h>
#include <LiquidCrystal.h>
LiquidCrystal lcd(4, 5, 6, 7, 8, 9);
#include "HX711.h"

// HX711.DOUT    - pin #2
// HX711.PD_SCK    - pin #3

HX711 scale(2, 3);        // parameter "gain" is ommited; the default value 128 is used by the library

float tera = 0;
int berat;
float fix;

void setup() {

  lcd.begin(16, 2);
  lcd.clear();
  lcd.noCursor();

  Serial.begin(9600);

/*
  Serial.println("Before setting up the scale:");
  Serial.print("read: \t\t");
  Serial.println(scale.read());            // print a raw reading from the ADC

  Serial.print("read average: \t\t");
  Serial.println(scale.read_average(20));      // print the average of 20 readings from the ADC

  Serial.print("get value: \t\t");
  Serial.println(scale.get_value(5));        // print the average of 5 readings from the ADC minus the tare weight (not set yet)

  Serial.print("get units: \t\t");
  Serial.println(scale.get_units(5), 1);    // print the average of 5 readings from the ADC minus tare weight (not set) divided
                        // by the SCALE parameter (not set yet)
*/
  scale.set_scale(2280.f);                      // this value is obtained by calibrating the scale with known weights; see the README for details
  scale.tare();                        // reset the scale to 0
/*
  Serial.println("After setting up the scale:");

  Serial.print("read: \t\t");
  Serial.println(scale.read());                 // print a raw reading from the ADC

  Serial.print("read average: \t\t");
  Serial.println(scale.read_average(20));       // print the average of 20 readings from the ADC

  Serial.print("get value: \t\t");
  Serial.println(scale.get_value(5));        // print the average of 5 readings from the ADC minus the tare weight, set with tare()

  Serial.print("get units: \t\t");
  Serial.println(scale.get_units(5), 1);        // print the average of 5 readings from the ADC minus tare weight, divided
                        // by the SCALE parameter set with set_scale

  Serial.println("Readings:");
*/

//lcd.setCursor(0, 0);
//lcd.print("WELLCOME");
//  delay(20000);
//  lcd.clear();

}

void loop() {

   berat = scale.get_units(10) * -1;
   fix = ((berat + 1.523) / 0.223) - tera ;
 
 if (fix < 0 ) {
  fix = 0;
  }

 Serial.println(fix);

 // Serial.print("one reading:\t");
 // Serial.print(scale.get_units(), 1);
 // Serial.print("\t| average:\t");
 // Serial.println(scale.get_units(10), 1);

  lcd.setCursor(0, 0);
  lcd.print("Berat= ");
  lcd.print(fix);
  lcd.print(" gr     ");

  scale.power_down();                   
  delay(1000);
  scale.power_up();

 Serial.println(fix);

}

e. Interface VB 6.0

Option Explicit
Dim arrdata()
Dim TotalBaca As Integer
Dim BMI As Single
Dim Keterangan As String
Const MAKSBACA = 10
Dim sHari As String
Dim aHari

Private Sub berhenti_Click()
  start.Enabled = True
    berhenti.Enabled = False
    TimerBaca.Enabled = False
End Sub

Private Sub Command1_Click()
Open "C:\Users\yanuar\Desktop" & "\project.txt" For Append As #1
Print #1, "======================"
Print #1, " Data dalam satu menit "
Print #1, "======================"
Print #1, "Tanggal = "; lbltanggal.Caption
Print #1, "  Jam   = "; lbljam.Caption
Print #1, " NIlai  = "; Label1.Caption
Print #1,
Close #1
End Sub

Private Sub Command2_Click()
Unload Me
End Sub


Private Sub Command3_Click()
Text1.Text = " "
Label1.Caption = " "

End Sub

Private Sub Form_Load()
Dim i As Byte
For i = 1 To 16
    ComboCOM.AddItem (i)
Next i

 aHari = Array("Minggu", "Senin", "Selasa", "Rabu", "Kamis", "Jumat", "Sabtu")

End Sub



Private Sub start_Click()
Dim u As Integer

    On Error GoTo ada_eror
   
    MSComm2.CommPort = ComboCOM.Text
    MSComm2.Settings = "9600,N,8,1"
    MSComm2.RThreshold = 15
    MSComm2.InputLen = 15
    MSComm2.InputMode = comInputModeText
    MSComm2.PortOpen = True ' buka port
   
    ReDim arrdata(1 To MAKSBACA + 1)
    For u = 1 To MAKSBACA
        arrdata(u) = 0
    Next
    TotalBaca = 0
    start.Enabled = False
    berhenti.Enabled = True
    TimerBaca.Enabled = True
ada_eror:
 If ComboCOM.ListIndex < 1 Then
    MsgBox "COM berada di Nomor : " & Err.Number & vbCrLf & Err.Description, vbCritical + vbOKOnly, "ERROR"
    start.Enabled = True
    berhenti.Enabled = True
    ComboCOM.Text = "Pilih COM"
End If
End Sub

Private Sub Timer1_Timer()
 sHari = aHari(Abs(Weekday(Date) - 1))
 lbltanggal.Caption = "" & sHari & "," & Format(Date, "dd mmmm yyyy")
 lbljam.Caption = Format(Time, "hh:mm:ss")
End Sub

Private Sub TimerBaca_Timer()
Dim strInput As String
Dim strPotong As String
Dim singleInput As Single
Dim u As Integer
    strInput = MSComm2.Input
        strPotong = strInput
        Text1.Text = Text1.Text + strPotong + vbCrLf
        singleInput = Val(strPotong)
        Label1.Caption = singleInput
        If TotalBaca >= MAKSBACA Then
            TimerBaca.Enabled = False
            If MSComm2.PortOpen = True Then MSComm2.PortOpen = False
            Call berhenti_Click
        End If
 
End Sub

f. VIDEO HASILNYA