main.cpp

00001 #include "mbed.h"
00002 #include "Hx711.h"
00003 
00004 
00005 
00006 float   calibration_factor = -1.0f; // this calibration factor is adjusted according to my load cell
00007 int32_t units_raw;
00008 float   units;
00009 float   ounces;
00010 int     offset = 0;
00011 
00012 Hx711 scale(D4, D5);
00013 
00014 //void delay(int delay){
00015 //    for(int i=0; i<delay;i++)    
00016 //}
00017 
00018 int main() {
00019       printf("HX711 calibration sketch\n");
00020       printf("Remove all weight from scale\n");
00021       printf("After readings begin, place known weight on scale\n");
00022       printf("Press + or a to increase calibration factor\n");
00023       printf("Press - or z to decrease calibration factor\n");
00024       
00025       offset = (int)scale.read();
00026       scale.set_offset(offset);
00027       printf("Reading: %d \n",offset);
00028       scale.set_scale(calibration_factor);   
00029     while(1) {
00030       wait_ms(1000);
00031 
00032       units_raw = scale.readRaw();
00033       units = scale.read();
00034       if (units < 0)
00035       {
00036         units = 0.00;
00037       }
00038 //      ounces = units * 0.035274f;
00039       printf("Raw reading: %d grams. \n",units_raw);
00040       printf("Actual reading: %f grams. \n",units);
00041 //      printf("Calibration_factor: %f\n",calibration_factor);
00042       wait_ms(10000);
00043     }
00044 }
00045 
00046 
00047 
00048 
00049 
00050 
00051