I think i asked so many silly questions in this forum... 
and Here's an another one to add count
.
//------- VARIABLES FOR ENTERTING THE FLOWRATE-------\\
#define data_buffer_size 80
#define starting_character 'F'// we can change the Both starting and ending characters
#define ending_character '\r'
char delimiters[] ="F"; // Strtok() function depends on these delimiters we can change for various functions
char data_buffer[data_buffer_size+1]; //Add 1 for NULL terminator
boolean store_string = false; // storeString variable initialization which is used in the get_serial_string() function
//---------------- BOOLEAN CONSTANTS TO HOLD THE VALVE POSITIONS ----------------------------\\
boolean s1_position = false;
boolean s2_position = false;
boolean s3_position = false;
boolean s4_position = false;
boolean s5_position = false;
boolean s6_position = false;
boolean s7_position = false;
//------------------------ PIN DECLARATION --------------------\\
#define s1_pin 3
#define s2_pin 4
#define s3_pin 5
#define s4_pin 6
#define s5_pin 7
#define s6_pin 8
#define s7_pin 9
#define st1_pin 10
#define st2_pin 11
#define tank_a_temp 13
#define tank_b_temp 14
//---------- FLOW RATE AND VOLUME DECLARATIONS ---------------------\\
int water_tank_flow_rate;
int water_volume;
int tank_a_flow_rate;
int tank_a_volume;
int tank_b_flow_rate;
int tank_b_volume;
void setup(){
// START THE SERIAL COMMUNICATION
Serial.begin(9600);//baud rate 9600 is better choice for lond cables < more distance less speed>
Serial1.begin(9600);//Serial1 is used for communication between arduino Uno And arduino Mega
//-------------------- PIN MODE DECLARATIONS -----------------------------\\
//VALVE TO CONTROL THE FLOW BETWEEN TANKS
pinMode(s1_pin,OUTPUT);
pinMode(s2_pin,OUTPUT);
pinMode(s3_pin,OUTPUT);
pinMode(s4_pin,OUTPUT);
pinMode(s5_pin,OUTPUT);
pinMode(s6_pin,OUTPUT);
pinMode(s7_pin,OUTPUT);
//STIRRING CONTROL PINS
pinMode(st1_pin,OUTPUT);
pinMode(st2_pin,OUTPUT);
// TEMPARATURE MEASUREMENT PINS
pinMode(tank_a_temp,OUTPUT);
pinMode(tank_b_temp,OUTPUT);
//------------------ASK THE USER TO ENTER REQUIRED VARIABLES------------------\\
Serial.println("PLEASE ENTER THE ALL FLOW RATE VALUES FOLLOWED BY F -------------> EX:F12");
Serial.println("");
const String question_1 = ("Enter the volume flow rate of water tank in LTR/MIN");
const String question_2 = ("Enter the quantity of water released into the Water Tank");
const String question_3 = ("Enter the volume flow rate of Metering pump Connected to the Tank A in LTR/MIN");
const String question_4 = ("Enter the Quantity of Solution released into the Reaction Tank From TANK - A in LTR's");
const String question_5 = ("Enter the volume flow rate of Metering pump Connected to the Tank B in LTR/MIN");
const String question_6 = ("Enter the Quantity of Solution released into the Reaction Tank From TANK - B in LTR's");
ask_ques_get_res(question_1);
water_tank_flow_rate = get_the_data(data_buffer,delimiters);
Serial.print("The volume flow rate of water tank in LTR/MIN ------>\t");
Serial.print(water_tank_flow_rate);
Serial.println("");
ask_ques_get_res(question_2);
water_volume = get_the_data(data_buffer,delimiters);
Serial.print("The Quantity of water released into Water Tank ------>\t");
Serial.print(water_volume);
Serial.println("");
ask_ques_get_res(question_3);
tank_a_flow_rate = get_the_data(data_buffer,delimiters);
Serial.print("The volume flow rate of Metering pump Connected to the Tank A in LTR/MIN ------>\t");
Serial.print(tank_a_flow_rate);
Serial.println("");
ask_ques_get_res(question_4);
tank_a_volume = get_the_data(data_buffer,delimiters);
Serial.print("The Quantity of Solution released into the Reaction Tank From TANK - A in LTR's ------>\t");
Serial.print(tank_a_volume);
Serial.println("");
ask_ques_get_res(question_5);
tank_b_flow_rate = get_the_data(data_buffer,delimiters);
Serial.print("The volume flow rate of Metering pump Connected to the Tank B in LTR/MIN ------>\t");
Serial.print(tank_b_flow_rate);
Serial.println("");
ask_ques_get_res(question_6);
tank_b_volume = get_the_data(data_buffer,delimiters);
Serial.print("The Quantity of Solution released into the Reaction Tank From TANK - B in LTR's ------>\t");
Serial.print(tank_b_volume);
Serial.println("");
}
void loop(){
//--------- STEP 1 ------\\
// relese_water() function is used to relesae the user specified water into water tank.
// this function is defined later
release_water();
}
void ask_ques_get_res(String question){
Serial.println(question);
while(!get_serial_string()){
//wait here until data is received normally few micro seconds
//it calls the function named get_serial_string and the function returns true if the full data received
}
Serial.print("you entered----->\t"); // print the user entered data
Serial.println(data_buffer);
}
// it returns true if the data is fully received
boolean get_serial_string(){
static byte data_buffer_index = 0;
while(Serial.available()>0){// loop until serial Rx buffer is empty
char incomingbyte = Serial.read();// read the data from serial buffer
if(incomingbyte==starting_character){
data_buffer_index = 0; //Initialize our dataBufferIndex variable
store_string = true; // we received the starting character so start reading
}
if(store_string){
//Let's check our index here, and abort if we're outside our buffer size
//We use our define here so our buffer size can be easily modified
if(data_buffer_index==data_buffer_size){
//Oops, our index is pointing to an array element outside our buffer.
Serial.println("Max characters in data buffer reached::::: the data_buffer_index_is reinitialized to 0");
data_buffer_index = 0;
break;
}
if(incomingbyte==ending_character){
data_buffer[data_buffer_index] = 0; //null terminate the C string
//Our data string is complete. return true
return true;
}
else{
data_buffer[data_buffer_index++] = incomingbyte;
data_buffer[data_buffer_index] = 0; //null terminate the C string
}
}
else{
Serial.println("Receiving Unwanetd Data.. Please check connections");
}
}//end of whiule loop
//We've read in all the available Serial data, and don't have a valid string yet, so return false
return false;
}
// function to Split spring and get the numeric data back
// using the strtok() function is a two step process
//the first call to strtok() initialization call. we pass it into the string (character array terminated with null)
//to be tokenized. and delimiters and it pases back the a pointer to the first token
//the second step is typically loop that repeatedly calls strtok().
// in this case we check if it is null or not.
// if its NULL,strtok finished tokenizing our string. if isn't NULL we make anothe call to strtok();
int get_the_data(char* buffer,const char* delimiter){
char* val_position;
int data;
val_position = strtok(buffer,delimiter);
while(val_position != NULL){
data = atoi(val_position);
val_position = strtok(NULL,delimiter);
}
return data;
}
void release_water(){
s3_position = digitalRead(s3_pin);// check the s3 valve position
if (!s3_position){// if s3 valve is closed
// calculate the time interval to open the valve
unsigned long water_tank_time = water_tank_flow_rate * water_volume;//we get time in Min Convert it to milliSeconds Since the function millis returns milliseconds value
water_tank_time = water_tank_time *60*1000;
// declare the variable to hold the run time
unsigned long water_tank_run_time;
//open the s1 valve to release the water from water tank to tank A
digitalWrite(s1_pin,HIGH);
//Start the timer
unsigned long water_tank_start_time = millis();
while((water_tank_run_time = millis() - water_tank_start_time) >= water_tank_time)
{
// keep open the s1 valve until required amount is released in to Tank A
Serial.print("The amount of water released into Tank A -------->\t");
Serial.print(water_tank_run_time * water_tank_flow_rate);
}//end of the while loop
//the transfer is completed close the valve
digitalWrite(s1_pin,LOW);
}//end of if loop
else{
Serial.println("Please check the position of S3 Valve");
}
}// end of release_water() function
i am getting the following error when I compile the code
error: 's1_pin' was not declared in this scope
But I declare the s1_pin
#define s1_pin 3
Why I am getting the error?