I am using Weighing scale RS232 communication and reading values on serial port:
For my project I only need decimal part ie 000.360 not +000.360 Kg
Code used for communication:
#include <SoftwareSerial.h>
SoftwareSerial mySerial(3, 4 );
void setup()
{
Serial.begin(9600);
mySerial.begin(9600);
}
void loop()
{
while (mySerial.available())
{
Serial.write(mySerial.read());
}
}
I would suggest that you look at the serial input basics thread. You could modify the Example 3 - Receive with start- and end-markers. Use + for the start marker and K for the end marker. The markers are discarded. The if you want to convert from ASCII text to a float data type, use the atof() function.
@AnshumanFauzdar
Why are you not at work/school ?
Here is a start;
#include <SoftwareSerial.h>
SoftwareSerial mySerial(3, 4); // RX, TX <------<<<< use the pins you want
char myArray[12] = {"012345678AB"};
void setup()
{
Serial.begin(9600);
mySerial.begin(9600);
}
void loop()
{
//myArray[12]
//012345678911 11 = newline
// 01
//+000.360 Kg_
while (mySerial.available() > 11)
{
myArray[0] = mySerial.read();
//find the first charater, +
if (myArray[0] == '+')
{
//read the remainding characters
for (byte i = 1; i < 12; i++)
{
myArray[i] = mySerial.read();
delay(1);
}
// Okay, myArray[1]thru myArray[7] has the data needed
//Test print the characters
for (byte i = 1; i < 8; i++)
{
Serial.print(myArray[i]);
}
Serial.println();
} //if
} //while
} //END of loop()
larryd:
@AnshumanFauzdar
Why are you not at work/school ?Here is a start;
#include <SoftwareSerial.h>
SoftwareSerial mySerial(3, 4); // RX, TX <------<<<< use the pins you want
char myArray[12] = {"012345678AB"};
void setup()
{
Serial.begin(9600);
mySerial.begin(9600);
}
void loop()
{
//myArray[12]
//012345678911 11 = newline
// 01
//+000.360 Kg_
while (mySerial.available() > 11)
{
myArray[0] = mySerial.read();
//find the first charater, +
if (myArray[0] == '+')
{
//read the remainding characters
for (byte i = 1; i < 12; i++)
{
myArray[i] = mySerial.read();
delay(1);
}
// Okay, myArray[1]thru myArray[7] has the data needed
//Test print the characters
for (byte i = 1; i < 8; i++)
{
Serial.print(myArray[i]);
}
Serial.println();
} //if
} //while
} //END of loop()
I am doing BTech @larryd, skipped 3 days LOL
Will continue from monday!
Thanks for code @larryd, Only because of you my project will work smoothly!!!
BIG THANK YOU!!
groundFungus:
I would suggest that you look at the serial input basics thread. You could modify the Example 3 - Receive with start- and end-markers. Use + for the start marker and K for the end marker. The markers are discarded. The if you want to convert from ASCII text to a float data type, use the atof() function.
Hey I want to compare values with a predefined value, in code below how can I do this?
#include <SoftwareSerial.h>
SoftwareSerial mySerial(10, 11);
char myArray[12] = {"012345678AB"};
#include<string.h>
#include <LiquidCrystal.h>
const int rs = 31, en = 30, d4 = 28, d5 = 26, d6 = 24, d7 = 22;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);
int relay = 9;
int pot2 = A2;
int button = 7;
int button2 = 6;
int button3 = 5;
int button4 = 4;
int button5 = 3;
int button6 = 2;
int potvalue2 = 0;
int buttonvalue = 1;
int buttonvalue2 = 1;
int buttonvalue3 = 1;
int buttonvalue4 = 1;
int buttonvalue5 = 1;
int buttonvalue6 = 1;
char weight = 1;
char maxvalue = 1;
int maxvalue2 = 1;
char valid[50] = "false";
char valid2[50] = "false";
char valid3[50] = "false";
char valid4[50] = "false";
char valid5[50] = "false";
char valid6[50] = "false";
void setup()
{
pinMode(relay, OUTPUT);
pinMode(button, INPUT);
pinMode(button2, INPUT);
Serial.begin(9600);
mySerial.begin(9600);
digitalWrite(relay, 1);
lcd.begin(16, 2);
}
void loop()
{
Serial.println(analogRead(pot2));
delay(100);
{
while (mySerial.available() > 11)
{
myArray[0] = mySerial.read();
//find the first charater, +
if (myArray[0] == '+')
{
//read the remainding characters
for (byte i = 1; i < 12; i++)
{
myArray[i] = mySerial.read();
delay(1);
}
// Okay, myArray[1]thru myArray[7] has the data needed
//Test print the characters
for (byte i = 1; i < 8; i++)
{
Serial.print(myArray[i]);
}
Serial.println();
}
}
}
lcd.setCursor(0, 1);
lcd.print(myArray);
buttonvalue = digitalRead(button);
buttonvalue2 = digitalRead(button2);
buttonvalue3 = digitalRead(button3);
buttonvalue4 = digitalRead(button4);
buttonvalue5 = digitalRead(button5);
buttonvalue6 = digitalRead(button6);
if(!strcmp(valid,"true"))
{
buttonvalue=1;
}
if(!strcmp(valid2,"true"))
{
buttonvalue2=1;
}
if(!strcmp(valid3, "true"))
{
buttonvalue3=1;
}
if(!strcmp(valid4, "true"))
{
buttonvalue4=1;
}
if(!strcmp(valid5, "true"))
{
buttonvalue5=1;
}
if (!strcmp(valid6, "true"))
{
buttonvalue6=1;
}
//FIRST BUTTON
if(buttonvalue == 1)
{
digitalWrite(relay, 0);
strcpy(valid,"true");
maxvalue = 0.500;
lcd.setCursor(1,0);
lcd.print("WT INPUT:");
lcd.print(maxvalue);
if(!strcmp(valid,"true"))
{
weight = myArray;
}
if(myArray>maxvalue)
{
digitalWrite(relay, 1);
strcpy(valid,"false");
}
}
// SECOND SWITCH
else if(buttonvalue2 == 1)
{
digitalWrite(relay, 0);
strcpy(valid2,"true");
maxvalue = 1.000;
lcd.setCursor(1,0);
lcd.print("WT INPUT:");
lcd.print(maxvalue);
if(!strcmp(valid2,"true"))
{
myArray;
}
if (myArray>maxvalue)
{
digitalWrite(relay, 1);
strcpy(valid2,"false");
}
}
// 3rd Button
else if(buttonvalue3 == 1)
{
digitalWrite(relay, 0);
strcpy(valid3,"true");
maxvalue = 2.000;
lcd.setCursor(1,0);
lcd.print("WT INPUT:");
lcd.print(maxvalue);
if(!strcmp(valid3,"true"))
{
myArray;
}
if(myArray>maxvalue)
{
digitalWrite(relay, 1);
strcpy(valid3,"false");
}
}
// 4th Button
else if(buttonvalue4 == 1)
{
digitalWrite(relay, 0);
strcpy(valid4,"true");
maxvalue = 3.000;
lcd.setCursor(1,0);
lcd.print("WT INPUT:");
lcd.print(maxvalue);
if(!strcmp(valid4,"true"))
{
myArray;
}
if(myArray>maxvalue)
{
digitalWrite(relay, 1);
strcpy(valid4,"false");
}
}
// 5th Button
else if(buttonvalue5 == 1)
{
digitalWrite(relay, 0);
strcpy(valid5,"true");
maxvalue = 4.000;
lcd.setCursor(1,0);
lcd.print("WT INPUT:");
lcd.print(maxvalue);
if(!strcmp(valid5,"true"))
{
myArray;
}
if(myArray>maxvalue)
{
digitalWrite(relay, 1);
strcpy(valid5,"false");
}
}
// Manual Button-Set value by Potentiometer
else if(buttonvalue6 == 1)
{
digitalWrite(relay, 0);
strcpy(valid6,"true");
lcd.setCursor(1,0);
lcd.print("WT INPUT:");
lcd.print(maxvalue2);
if(!strcmp(valid6,"true"))
{
potvalue2 = analogRead(pot2);
myArray;
maxvalue2 = potvalue2;
}
if(myArray>maxvalue2)
{
digitalWrite(relay, 1);
strcpy(valid6,"false");
}
}
}
What kind of values?
For numbers:
//if - Arduino Reference
if(value1 == value2)
{
// they are equal
}
For strings (null terminated character arrays);
//http://www.cplusplus.com/reference/cstring/strcmp/?kw=strcmp
if(strcmp (string1,string2) == 0)
{
// strings are equal
}
for arrays (blocks of memory, not null terminated):
//http://www.cplusplus.com/reference/cstring/memcmp/?kw=memcmp
if(memcmp(array1, array2, sizeof(array1)) == 0
{
// the blocks of memory are equal
}
Assuming that you have received this weight information: +000.360 Kg. You want to separate 0.360 (Kg)(fractional part) from the total and compare it with 0.250 (Kg) and then take an action (built-in L of UNO will become ON) based on the result of comparison.
The Sketch (The fractional part is in this variable: float ffracWt;.
#include<SoftwareSerial.h>
SoftwareSerial mySUART(3, 4); //SRX, STX
bool flag1 = LOW;
char myWeight[20] = "";
char intPart[3] = ""; //integer part
char fracPart[3] = ""; //fractional part
int wtAP = 0;
void setup()
{
Serial.begin(9600);
mySUART.begin(9600);
pinMode(13, OUTPUT);
digitalWrite(13, LOW);
}
void loop()
{
if (mySUART.available())// == 13) //+000.360 Kg CR LF
{
//Serial.print((char)mySUART.read());
if (flag1 != HIGH)
{
byte x = mySUART.read();
if (x == '+')
{
flag1 = HIGH;
}
}
else
{
myWeight[wtAP] = mySUART.read();
wtAP++;
if (wtAP == 8)
{
Serial.print("Total Weight = ");
Serial.println(myWeight);
getFractionalPart();
myWeight[20] = "";
wtAP = 0;
flag1 = LOW;
}
}
}
}
void getFractionalPart()
{
fracPart[0] = myWeight[4];
fracPart[1] = myWeight[5];
fracPart[2] = myWeight[6];
//----------------------
unsigned long fracWt = atol(fracPart);
float ffracWt = (float)fracWt / 1000000.0;
Serial.print("Fractional Weight = ");
Serial.println(ffracWt, 3); //0.360
Serial.println();
if(ffracWt > 0.250)
{
digitalWrite(13, HIGH); //built-in L of UNO is ON
}
}
GolamMostafa:
Assuming that you have received this weight information: +000.360 Kg. You want to separate 0.360 (Kg)(fractional part) from the total and compare it with 0.250 (Kg) and then take an action (built-in L of UNO will become ON) based on the result of comparison.The Sketch (The fractional part is in this variable: float ffracWt;.
#include<SoftwareSerial.h>
SoftwareSerial mySUART(3, 4); //SRX, STX
bool flag1 = LOW;
char myWeight[20] = "";
char intPart[3] = ""; //integer part
char fracPart[3] = ""; //fractional part
int wtAP = 0;
void setup()
{
Serial.begin(9600);
mySUART.begin(9600);
pinMode(13, OUTPUT);
digitalWrite(13, LOW);
}
void loop()
{
if (mySUART.available())// == 13) //+000.360 Kg CR LF
{
//Serial.print((char)mySUART.read());
if (flag1 != HIGH)
{
byte x = mySUART.read();
if (x == '+')
{
flag1 = HIGH;
}
}
else
{
myWeight[wtAP] = mySUART.read();
wtAP++;
if (wtAP == 8)
{
Serial.print("Total Weight = ");
Serial.println(myWeight);
getFractionalPart();
myWeight[20] = "";
wtAP = 0;
flag1 = LOW;
}
}
}
}
void getFractionalPart()
{
fracPart[0] = myWeight[4];
fracPart[1] = myWeight[5];
fracPart[2] = myWeight[6];
//----------------------
unsigned long fracWt = atol(fracPart);
float ffracWt = (float)fracWt / 1000000.0;
Serial.print("Fractional Weight = ");
Serial.println(ffracWt, 3); //0.360
Serial.println();
if(ffracWt > 0.250)
{
digitalWrite(13, HIGH); //built-in L of UNO is ON
}
}
Thank you so much @GolamMostafa, Now I am able to make my project works!
BIG THANK YOU!