Hx711 with pic16f877A

[Michel09]

I want to create a digital weighing indicator based on the hx711. I made the wiring diagram on proteus and I did the C code on mikroC. However I can't read anything on the serial monitor. I will put the C code and the diagram in proteus. I need your help please

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Paste on the body of the thread the code took from within the attached file, enclosed with Syntax tags.

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#define _XTAL_FREQ 20000000
#define DT_PIN RB1_bit
#define SCK_PIN RB0_bit
#define DT_TRIS TRISB1_bit
#define SCK_TRIS TRISB0_bit
 
long offset=0;
float scale =1;
float known_weight=1000;
void init_hx711(void);
long read_hx711(void);
void tare(void);
void calibrate(float known_weight);
float get_weight(void);
 
 
void main() 
{
     UART1_Init(9600);
     delay_ms(100);
     DT_TRIS=1;
     SCK_TRIS=0;
     init_hx711();
     calibrate(known_weight);
     tare();
     //calibrate(float known_weight);
 
     
while (1)
{
  float weight = get_weight();
 
  char weight_str[10];
  char LuRaw[10];
  UART1_Write_Text("Raw value:  ");
  FloatToStr(read_hx711(), LuRaw);
  UART1_Write_Text("  g\r\n");
   UART1_Write_Text("calibration");
  UART1_Write_Text("Poids:  ");
  FloatToStr(weight, weight_str);
  UART1_Write_Text(" g\r\n");
  delay_ms(1000);
 
}
 
     }
void init_hx711(void) 
{
     SCK_PIN=0;
}
long read_hx711(void) 
{      int i;
     long count =0;
     while (DT_PIN);
     for(i =0; i<24; i++)
     {  SCK_PIN=1;
        delay_us(1);
        count=count <<1;
        SCK_PIN=0;
        delay_us(1);
        if(DT_PIN) count++;
       }
     SCK_PIN =1;
     delay_us(1);
     SCK_PIN=0;
     delay_us(1);
     count^=0x800000;
     
     return count;
}
void tare (void) 
{
     long sum=0;
     int i;
     for(i =0;i<10;i++) 
     {
             sum+=read_hx711();
             delay_ms(100);
     }
     
}
 
void calibrate( float known_weight){
     long raw_value= read_hx711()-offset;
     scale= raw_value/known_weight;
     }
float get_weight(void) {
      long raw_value= read_hx711() - offset;
      return raw_value/scale;
      }

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[andre_luis]

You did not mention if there is some activity on the uC TX pin.
There is an osciloscope there, connected to nothing.

 

[Michel09]

the oscilloscope is there to visualize the output signals from the hx711 but I disconnected it

 

[Michel09]

There is the different signals. Yellow's signal it's for the clock and red's signal for the data output

 

[andre_luis]

...and red's signal for the data output

Did you even try to adjust the time base of the osciloscope scan to magnify the tinny pulse seen there ?

 

[Michel09]

No problem

--- Updated May 24, 2024 ---

No problem

I adjusted the time-related parameter as much as possible

 

[andre_luis]

You increased the time base instead of decreasing it, doesn't it seem clear that it is now more difficult to identify details in the pulse than before?

 

[Michel09]

You increased the time base instead of decreasing it, doesn't it seem clear that it is now more difficult to identify details in the pulse than before?

should I return to the microsecond domain?

 

[andre_luis]

should I return to the microsecond domain?

The scale was not in the microsecond domain at any time. You need to check if the little pulse seen there represents a serial data stream; If the baudrate configured in the uC is wrongly set, by amplifying the pulse in time (reducing the scope time scale) you can determine if this pulse is a mere artifact or if it is in fact a serial data, so I let you answer the question yourself.

 

[Michel09]

The scale was not in the microsecond domain at any time. You need to check if the little pulse seen there represents a serial data stream; If the baudrate configured in the uC is wrongly set, by amplifying the pulse in time (reducing the scope time scale) you can determine if this pulse is a mere artifact or if it is in fact a serial data, so I let you answer the question yourself.

during compilation the compiler generated a warning related to the baud which exceeded 15 or 9615. could this be a problem because I immediately modified the baud of the serial monitor but still nothing. what is your opinion on my code please

 

[aliarifat794]

You can check these docs.

GitHub - Fatihalparslan/HX711-WITH-CCS-C-FOR-PIC16F877A

Contribute to Fatihalparslan/HX711-WITH-CCS-C-FOR-PIC16F877A development by creating an account on GitHub.

github.com

HX711 ADC interfacing with PIC16F887A

Hello guy, I'm trying to interface hx711 adc with pi16f877a.. I've found the reference C program in the datasheet for hx711.. from that i was able to get raw readings from the hx711, i am using mikroC complier. my question is how can i get this readings to represent a weight.. is there any...

forum.allaboutcircuits.com

 

[Michel09]

You can check these docs.

GitHub - Fatihalparslan/HX711-WITH-CCS-C-FOR-PIC16F877A

Contribute to Fatihalparslan/HX711-WITH-CCS-C-FOR-PIC16F877A development by creating an account on GitHub.

github.com

HX711 ADC interfacing with PIC16F887A

Hello guy, I'm trying to interface hx711 adc with pi16f877a.. I've found the reference C program in the datasheet for hx711.. from that i was able to get raw readings from the hx711, i am using mikroC complier. my question is how can i get this readings to represent a weight.. is there any...

forum.allaboutcircuits.com

I have already read the second document and I checked we have the same code but I do not understand why I do not obtain the chronogram illustrated in the datasheet

 

[andre_luis]

You seem to be systematically disregarding my tips about trying to determine what is and isn't working; leaving this thread, good luck.

 

[Michel09]

You seem to be systematically disregarding my tips about trying to determine what is and isn't working; leaving this thread, good luck

I'm trying to implement your advice but I can't. can you enlighten me better