san m
Weight scale using ADS1220
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WeightScale
by 
san m
Diff: main.cpp
- Revision:
- 1:933f47cce5bf
- Parent:
- 0:94208ccccbde
- Child:
- 4:3ca00da0024d
--- a/main.cpp Tue May 24 13:45:41 2016 +0000
+++ b/main.cpp Wed Feb 15 15:32:38 2017 +0000
@@ -1,129 +1,52 @@
#include "mbed.h"
#include "ADS1220.h"
-#include "DigoleSerialDisp.h"
-#include "DataAnalysis.h"
-#include "MedianFilt.h"
#include "math.h"
-#define NWIDTH 20 /* Size of the data buffer; length of the sequence. */
-#define STOPPER 0 /* Smaller than any datum */
-#define AVERGARE_COUNT 1000 /*Count can be any number from 2,4,8,16 */
+#define NWIDTH 20 /* Size of the data buffer; length of the sequence. */
+#define STOPPER 0 /* Smaller than any datum */
+#define AVERGARE_COUNT 1000 /*Count can be any number from 2,4,8,16 */
-#define PGA 128 // Programmable Gain = 1
-#define VREF 5.0 // Internal reference of 2.048V
+#define PGA 128 // Programmable Gain = 1
+#define VREF 5.0 // Internal reference of 2.048V
#define VFSR VREF/PGA
#define FSR (((long int)1<<23))
#define LSB_Size (VFSR/FSR)
-ADS1220 ads1220_com(SPI_MOSI, SPI_MISO, SPI_SCK);
-Serial _serial_comm(SERIAL_TX,SERIAL_RX);
+ADS1220 ads1220_com(SPI_MOSI, SPI_MISO, SPI_SCK,SPI_CS);
Serial data_serial(USBTX, USBRX);
-SerialDisp Lcd_display(LCD_MOSI, LCD_MISO, LCD_SCK);
InterruptIn DRDY(PC_5);
-InterruptIn Button_press(USER_BUTTON);
-
-unsigned char str[] = "PCE Force Gauge ";
-unsigned char removeweight_str[] = "Please Remove Weights....... ";
-unsigned char placeweight_str[] = "Calculating the offset..... ";
-char New_data_avialable,button_pressed = 0,Analysis;
+bool New_data_avialable;
void ext_int_DRDY(void);
-void showvolt(float volts);
-void menu(void);
-signed long avg_filter(signed long avg_val, int n);
-void Caliberation(void);
-void pressed(void);
-float code2enob(float c);
-void weight_cal(void);
-signed long Median(signed long median_val, int n, int median_cnt);
-float g2scale(float g, int scale);
-float medfilter(signed long datum);
-float median(signed long data[]);
-float Mode_Filter(signed long avg_val, int n);
float code2volt(float c);
-signed long tData,avg_tdata;
-unsigned config_Buff[4];
-float offset_Val = 0, actual_weight = 0,disp_wt,volt;
-char get_char;
+signed long tData;
+float volt;
int main()
{
- char buf[10],time_buf[14];
- Button_press.mode(PullUp);
- // Delay for initial pullup to take effect
+ data_serial.baud(115200);
wait(0.1);
DRDY.rise(&ext_int_DRDY);
- Button_press.fall(&pressed);
ads1220_com.Config();
ads1220_com.SendStartCommand();
- Lcd_display.LCD12864_Initialise();
- data_serial.baud(115200);
- // Setup a serial interrupt function to receive data
- _serial_comm.attach(&SerialData::Rx_interrupt, _serial_comm.RxIrq);
- // Setup a serial interrupt function to transmit data
- _serial_comm.attach(&SerialData::Tx_interrupt, _serial_comm.TxIrq);
- Lcd_display.LCD12864_DrawLogo();
- set_time(1887180123); // Set RTC time to 16 December 2013 10:05:23 UTC
while(1)
{
- clock_t seconds = time(NULL);
- weight_cal();
- strftime(time_buf,sizeof(time_buf), "%I:%M:%S (%p)", localtime(&seconds));
- Lcd_display.LCD12864_DisplayString(0,0,(uint8_t *)&str[0],COUNTOF(str));
- Lcd_display.LCD12864_DisplayString(1,0,(uint8_t *)&time_buf[0],COUNTOF(time_buf));
- sprintf(buf,"%.4f KG", (float)disp_wt);
- wait_ms(2);
- Lcd_display.LCD12864_DisplayString(2,2,(uint8_t *)&buf[0],COUNTOF(buf));
- wait(0.5);
- if(Button_press)
- {
- Analysis = 1;
- }
+ if(New_data_avialable)
+ {
+ New_data_avialable = 0;
+ tData = ads1220_com.ReadData();
+ volt = code2volt(tData);
+ data_serial.printf("\rVoltage : %f\n",volt);
+ }
}
}
-
-
-void weight_cal(void)
-{
- if(button_pressed)
- {
- button_pressed = 0;
- if(New_data_avialable)
- {
- New_data_avialable = 0;
- Caliberation();
- wait(1);
- }
- }
- else
- {
- if(New_data_avialable)
- {
- //led = !led;
- New_data_avialable = 0;
- tData = ads1220_com.ReadData();
- volt = code2volt(tData);
- data_serial.printf("\rVoltage : %f\n",volt);
- avg_tdata = Mode_Filter(tData, AVERGARE_COUNT);
- //data_serial.printf("\r\nHex code %x",avg_tdata);
- actual_weight = avg_tdata - offset_Val;
- disp_wt = actual_weight/weight_gram ;
- disp_wt = disp_wt * gain_error_correction;
- disp_wt = g2scale(disp_wt,3);
- //data_serial.printf("\r%.4f\n",disp_wt);
- //data_serial.printf("\t KG\n");
- }
- }
-}
-
-
float code2volt(float c)
{
float Vout = 0;
@@ -131,351 +54,6 @@
return Vout;
}
-
-float g2scale(float g, int scale)
-{
- switch(scale)
- {
- case 0:
- return g*1e6;
- case 1:
- return g*1e3;
- case 2:
- return g;
- case 3:
- return g/1e3;
- case 4:
- return g*(16.0/453.59237);
- case 5:
- return g/453.59237;
- case 6:
- return g/(14.0*453.59237);
- default: // something wrong
- return 0;
- }
-}
-
-float code2enob(float c)
-{
- if (c==0) return 24.0;
- return 24.0- logf(c);
-
-}
-
-void pressed(void)
-{
- button_pressed = 1;
-}
-signed long avg_filter(signed long avg_val, int n)
-{
- int i;
- signed long mean;
- mean=0;
- for (i=0;i<n;++i)
- mean+= avg_val;
- return mean/n;
-}
-void Caliberation(void)
-{
- signed long cal_offset = 0;
- Lcd_display.LCD12864_CLEAR();
- wait_ms(2);
- Lcd_display.LCD12864_DisplayString(1,0,(unsigned char *)&removeweight_str[0],COUNTOF(removeweight_str));
- data_serial.printf("\rPlease Remove Weights.......\n");
- wait(2);
- Lcd_display.LCD12864_CLEAR();
- wait_ms(2);
- Lcd_display.LCD12864_DisplayString(1,0,(unsigned char *)&placeweight_str[0],COUNTOF(placeweight_str));
- data_serial.printf("\rCalculating the offset......\n");
- wait(2);
- tData = ads1220_com.ReadData();
- offset_Val = Mode_Filter(tData, AVERGARE_COUNT);
- cal_offset = (offset_Val / (weight_gram));
- cal_offset = cal_offset * gain_error_correction;
- cal_offset = g2scale(cal_offset,3);
- data_serial.printf("\r%.4f",(float *)cal_offset);
- Lcd_display.LCD12864_CLEAR();
- wait_ms(1);
-}
-
-
-float Mode_Filter(signed long avg_val, int n)
-{
- float returnval = 0;
- // read multiple values and sort them to take the mode
- signed long sortedValues[n];
- for(int i=0;i<n;i++)
- {
- signed long value = avg_val;
- int j;
- if(value < sortedValues[0] || i==0)
- {
- j=0; //insert at first position
- }
- else
- {
- for(j=1;j<i;j++){
- if(sortedValues[j-1]<=value && sortedValues[j]>=value)
- {
- // j is insert position
- break;
- }
- }
- }
- for(int k=i;k>j;k--)
- {
- // move all values higher than current reading up one position
- sortedValues[k]=sortedValues[k-1];
- }
- sortedValues[j]=value; //insert current reading
- }
- //return scaled mode of 700 values
- for(int i=200;i<800;i++)
- {
- returnval +=sortedValues[i];
- }
- returnval = returnval/600;
- return returnval;
-}
-
-void Set_Disp_Mux_config()
-{
- char Mux_data;
-
-
- Mux_data = data_serial.getc();
- data_serial.printf("\n");
-
- switch(Mux_data)
- {
-
- case '0':
- ads1220_com.set_MUX(0);
- data_serial.printf("Input Multiplexer Configuration Set to 0: AINP = AIN0, AINN = AIN1\n");
- ads1220_com.ReadRegister(ADS1220_0_REGISTER, 0x01, &config_Buff[0]);
- data_serial.printf("\r REG0 : %x\n",config_Buff[0]);
- break;
- case '1':
- ads1220_com.set_MUX(1);
- data_serial.printf("Input Multiplexer Configuration Set to 1: AINP = AIN0, AINN = AIN2\n");
- ads1220_com.ReadRegister(ADS1220_0_REGISTER, 0x01, &config_Buff[0]);
- data_serial.printf("\r REG0 : %x\n",config_Buff[0]);
- break;
- case '2':
- ads1220_com.set_MUX(2);
- data_serial.printf("Input Multiplexer Configuration Set to 2: AINP = AIN0, AINN = AIN3\n");
- ads1220_com.ReadRegister(ADS1220_0_REGISTER, 0x01, &config_Buff[0]);
- data_serial.printf("\r REG0 : %x\n",config_Buff[0]);
- break;
- case '3':
- ads1220_com.set_MUX(3);
- data_serial.printf("Input Multiplexer Configuration Set to 3: AINP = AIN1, AINN = AIN2\n");
- ads1220_com.ReadRegister(ADS1220_0_REGISTER, 0x01, &config_Buff[0]);
- data_serial.printf("\r REG0 : %x\n",config_Buff[0]);
- break;
- case '4':
- ads1220_com.set_MUX(4);
- data_serial.printf("Input Multiplexer Configuration Set to 4: AINP = AIN1, AINN = AIN3\n");
- ads1220_com.ReadRegister(ADS1220_0_REGISTER, 0x01, &config_Buff[0]);
- data_serial.printf("\r REG0 : %x\n",config_Buff[0]);
- break;
- case '5':
- ads1220_com.set_MUX(5);
- data_serial.printf("Input Multiplexer Configuration Set to 5: AINP = AIN2, AINN = AIN3\n");
- ads1220_com.ReadRegister(ADS1220_0_REGISTER, 0x01, &config_Buff[0]);
- data_serial.printf("\r REG0 : %x\n",config_Buff[0]);
- break;
- case '6':
- ads1220_com.set_MUX(6);
- data_serial.printf("Input Multiplexer Configuration Set to 6: AINP = AIN1, AINN = AIN0\n");
- ads1220_com.ReadRegister(ADS1220_0_REGISTER, 0x01, &config_Buff[0]);
- data_serial.printf("\r REG0 : %x\n",config_Buff[0]);
- break;
- case '7':
- ads1220_com.set_MUX(7);
- data_serial.printf("Input Multiplexer Configuration Set to 7: AINP = AIN3, AINN = AIN2\n");
- ads1220_com.ReadRegister(ADS1220_0_REGISTER, 0x01, &config_Buff[0]);
- data_serial.printf("\r REG0 : %x\n",config_Buff[0]);
- break;
- case '8':
- ads1220_com.set_MUX(8);
- data_serial.printf("Input Multiplexer Configuration Set to 8: AINP = AIN0, AINN = AVSS\n");
- ads1220_com.ReadRegister(ADS1220_0_REGISTER, 0x01, &config_Buff[0]);
- data_serial.printf("\r REG0 : %x\n",config_Buff[0]);
- break;
- case '9':
- ads1220_com.set_MUX(9);
- data_serial.printf("Input Multiplexer Configuration Set to 9: AINP = AIN1, AINN = AVSS\n");
- ads1220_com.ReadRegister(ADS1220_0_REGISTER, 0x01, &config_Buff[0]);
- data_serial.printf("\r REG0 : %x\n",config_Buff[0]);
- break;
- default:
- break;
-
-
- }
-}
-
-void Set_Disp_Gain_config(void)
-{
- char Mux_data;
-
-
- Mux_data = data_serial.getc();
- data_serial.printf("\n");
-
- switch(Mux_data)
- {
-
- case '0':
- ads1220_com.set_GAIN(0);
- data_serial.printf("Set Gain Configuration to 0 for Gain = 1 \n");
- ads1220_com.ReadRegister(ADS1220_0_REGISTER, 0x01, &config_Buff[0]);
- data_serial.printf("\r REG0 : %x\n",config_Buff[0]);
- break;
- case '1':
- ads1220_com.set_GAIN(1);
- data_serial.printf("Set Gain Configuration to 1 for Gain = 2 \n");
- ads1220_com.ReadRegister(ADS1220_0_REGISTER, 0x01, &config_Buff[0]);
- data_serial.printf("\r REG0 : %x\n",config_Buff[0]);
- break;
- case '2':
- ads1220_com.set_GAIN(2);
- data_serial.printf("Set Gain Configuration to 2 for Gain = 4 \n");
- ads1220_com.ReadRegister(ADS1220_0_REGISTER, 0x01, &config_Buff[0]);
- data_serial.printf("\r REG0 : %x\n",config_Buff[0]);
- break;
- case '3':
- ads1220_com.set_GAIN(3);
- data_serial.printf("Set Gain Configuration to 3 for Gain = 8 \n");
- ads1220_com.ReadRegister(ADS1220_0_REGISTER, 0x01, &config_Buff[0]);
- data_serial.printf("\r REG0 : %x\n",config_Buff[0]);
- break;
- case '4':
- ads1220_com.set_GAIN(4);
- data_serial.printf("Set Gain Configuration to 4 for Gain = 16 \n");
- ads1220_com.ReadRegister(ADS1220_0_REGISTER, 0x01, &config_Buff[0]);
- data_serial.printf("\r REG0 : %x\n",config_Buff[0]);
- break;
- case '5':
- ads1220_com.set_GAIN(5);
- data_serial.printf("Set Gain Configuration to 5 for Gain = 32 \n");
- ads1220_com.ReadRegister(ADS1220_0_REGISTER, 0x01, &config_Buff[0]);
- data_serial.printf("\r REG0 : %x\n",config_Buff[0]);
- break;
- case '6':
- ads1220_com.set_GAIN(6);
- data_serial.printf("Set Gain Configuration to 6 for Gain = 64 \n");
- ads1220_com.ReadRegister(ADS1220_0_REGISTER, 0x01, &config_Buff[0]);
- data_serial.printf("\r REG0 : %x\n",config_Buff[0]);
- break;
- case '7':
- ads1220_com.set_GAIN(7);
- data_serial.printf("Set Gain Configuration to 7 for Gain = 128 \n");
- ads1220_com.ReadRegister(ADS1220_0_REGISTER, 0x01, &config_Buff[0]);
- data_serial.printf("\r REG0 : %x\n",config_Buff[0]);
- break;
- default:
- break;
- }
-}
-
-void Set_Disp_Bypass_config(void)
-{
- char Bypass_data;
-
-
- Bypass_data = data_serial.getc();
- data_serial.printf("\n");
-
- switch(Bypass_data)
- {
-
- case '0':
- ads1220_com.set_PGA_BYPASS(0);
- data_serial.printf("Set PGA Bypass Configuration to 0 for PGA Enabling \n");
- ads1220_com.ReadRegister(ADS1220_0_REGISTER, 0x01, &config_Buff[0]);
- data_serial.printf("\r REG0 : %x\n",config_Buff[0]);
- break;
- case '1':
- ads1220_com.set_PGA_BYPASS(1);
- data_serial.printf("Set PGA Bypass Configuration to 1 for PGA Disabled and bypassed\n");
- ads1220_com.ReadRegister(ADS1220_0_REGISTER, 0x01, &config_Buff[0]);
- data_serial.printf("\r REG0 : %x\n",config_Buff[0]);
- break;
-
- default:
- break;
- }
-}
-
-void menu(void)
-{
- uint8_t data;
-
- data_serial.printf("Menu :\n");
- data_serial.printf("\r0.Set Input Multiplexer Configuration\n");
- data_serial.printf("\r1.Set Gain\n");
- data_serial.printf("\r2.Set Data Rate\n");
- data_serial.printf("\r3.Set Operation Mode\n");
- data_serial.printf("\r4.Set Conversion Mode\n");
- data_serial.printf("\r5.Set Temprature Sensor Mode\n");
- data_serial.printf("\r6.Set Burn out Current Sources\n");
- data_serial.printf("\r7.Set Voltage Refernce Selection\n");
- data_serial.printf("\r8.Set Power Down Configuration\n");
-
- data = data_serial.getc();
- data_serial.printf("\n");
- switch(data)
- {
- case '0':
- data_serial.printf("\rEnter the value to set Input Multiplexer Configuration\n");
- data_serial.printf("\r0: AINP = AIN0, AINN = AIN1 \n");
- data_serial.printf("\r1: AINP = AIN0, AINN = AIN2 \n");
- data_serial.printf("\r2: AINP = AIN0, AINN = AIN3 \n");
- data_serial.printf("\r3: AINP = AIN1, AINN = AIN2 \n");
- data_serial.printf("\r4: AINP = AIN1, AINN = AIN3 \n");
- data_serial.printf("\r5: AINP = AIN2, AINN = AIN3 \n");
- data_serial.printf("\r6: AINP = AIN1, AINN = AIN0 \n");
- data_serial.printf("\r7: AINP = AIN3, AINN = AIN2 \n");
- data_serial.printf("\r8: AINP = AIN0, AINN = AVSS \n");
- data_serial.printf("\r9: AINP = AIN1, AINN = AVSS \n");
- data_serial.printf("\rs.Exit\n");
-
- Set_Disp_Mux_config();
- break;
- case '1':
- data_serial.printf("\rEnter the value to set Gain\n");
- data_serial.printf("\r0: Gain = 1 \n");
- data_serial.printf("\r1: Gain = 2 \n");
- data_serial.printf("\r2: Gain = 4 \n");
- data_serial.printf("\r3: Gain = 8 \n");
- data_serial.printf("\r4: Gain = 16 \n");
- data_serial.printf("\r5: Gain = 32 \n");
- data_serial.printf("\r6: Gain = 64 \n");
- data_serial.printf("\r7: Gain = 128 \n");
- data_serial.printf("\rs.Exit\n");
-
- Set_Disp_Gain_config();
- break;
- case '2':
- data_serial.printf("\rEnter the value to set Bypass\n");
- data_serial.printf("\r0: PGA Enabled\n");
- data_serial.printf("\r1: PGA Disabled\n");
- data_serial.printf("\rs.Exit\n");
-
- Set_Disp_Bypass_config();
- break;
-
- default:
- break;
- }
-
-}
-
-
-
-
void ext_int_DRDY(void)
{
New_data_avialable = 1;