#include <LiquidCrystal.h>
#define HX711_SCK A0
#define HX711_DT A1
LiquidCrystal lcd(8, 9, 10, 11, 12, 13);
extern void Init_Hx711();
extern unsigned long HX711_Read(void);
extern unsigned int Get_Weight();
extern void Get_OFFSET();
long HX711_Buffer = 0;
long Weight_OFFSET = 0,Weight_Real = 0;
int Weight = 0;
unsigned long M_Weight=0,ADC_Value=0;
void setup()
{
Init_Hx711(); //IO setting initialization module connected HX711
lcd.begin(16, 2);
analogReference(INTERNAL);
Serial.begin(9600);
Serial.print("40 Kg Loadcell reading!\n");
delay(2000);
Get_OFFSET(); //Get fur
}
void loop()
{
ADC_Value=HX711_Read();
M_Weight=(ADC_Value-8409088)*0.00793457031;
Weight = Get_Weight(); //Calculated on the weight of the weight sensor
Serial.print(M_Weight); //Serial Display Weight
Serial.print(" g\n"); //Display Units
Serial.print("\n"); //Display Units
delay(1000); //Delay 1s
lcd.setCursor(0, 0);
lcd.print(M_Weight, 1);
lcd.print(" g");
lcd.print(" ");
delay(200);
}
//****************************************************
//Initialization of HX711
//****************************************************
void Init_Hx711()
{
pinMode(HX711_SCK, OUTPUT);
pinMode(HX711_DT, INPUT);
}
//****************************************************
//Get Weight No load
//****************************************************
void Get_OFFSET()
{
HX711_Buffer = HX711_Read();
Weight_OFFSET = HX711_Buffer;
}
//****************************************************
//Get Weight at Actual load
//****************************************************
unsigned int Get_Weight()
{
HX711_Buffer = HX711_Read();
HX711_Buffer = HX711_Buffer;
Weight_Real = HX711_Buffer;
Weight_Real = Weight_Real - Weight_OFFSET; //Get AD sampling value in kind .
Weight_Real = (unsigned int)((float)Weight_Real/7.35+0.05);
// Calculate the actual physical weight
// Because different sensor characteristic curve is not the same, so that each sensor and to correct the divisor 4.30 here
// When they find out of the test weight is too large, increase the value.
// If the test out of the weight is too small, decrease the value change .
// This value is generally about 7.16 . Because different sensors may be.
// +0.05 Percentile to rounding
return Weight_Real;
}
//****************************************************
//Function for HX711 reading
//****************************************************
unsigned long HX711_Read(void) //Gain 128
{
unsigned long count;
unsigned char i;
bool Flag = 0;
digitalWrite(HX711_DT, HIGH);
delayMicroseconds(1);
digitalWrite(HX711_SCK, LOW);
delayMicroseconds(1);
count=0;
while(digitalRead(HX711_DT));
for(i=0;i<24;i++)
{
digitalWrite(HX711_SCK, HIGH);
delayMicroseconds(1);
count=count<<1;
digitalWrite(HX711_SCK, LOW);
delayMicroseconds(1);
if(digitalRead(HX711_DT))
count++;
}
digitalWrite(HX711_SCK, HIGH);
count ^= 0x800000;
delayMicroseconds(1);
digitalWrite(HX711_SCK, LOW);
delayMicroseconds(1);
return(count);
}