can't seem to multiply by a float?

Projects Programming
3

here is the entire code :slight_smile: airspeed is a string that's converted to a float.

#include <Arduino.h>

// Motor steps per revolution. Most steppers are 200 steps or 1.8 degrees/step
#define MOTOR_STEPS 12.5
// Target RPM for cruise speed
#define RPM 100
// Acceleration and deceleration values are always in FULL steps / s^2
#define MOTOR_ACCEL 50
#define MOTOR_DECEL 50

// Microstepping mode. If you hardwired it to save pins, set to the same value here.
#define MICROSTEPS 16

#define DIR 2
#define STEP 3
#define ENABLE 13 // optional (just delete ENABLE from everywhere if not used)

 #include "A4988.h"
 #define MS1 10
 #define MS2 11
 #define MS3 12
 A4988 stepper(MOTOR_STEPS, DIR, STEP, ENABLE, MS1, MS2, MS3);
 
int CodeIn;// used on all serial reads
int KpinNo; 
int Koutpin;

String KoldpinStateSTR, KpinStateSTR, Kstringnewstate,Kstringoldstate;
String gearSimple; 

float a = 0;
float a2;
String airspeed;
float oldas = 0;
int b;


void setup() 
{
  Kstringoldstate = "111111111111111111111111111111111111111111111111111111111111111111111";
  
  for (int KoutPin = 8; KoutPin < 70; KoutPin++)// Get all the pins ready for simconnect codes and "Keys"(all inputs)  
  {
    pinMode(KoutPin, INPUT);
    digitalWrite(KoutPin, HIGH);  
  }
  
 Serial.begin(115200);   

 stepper.begin(RPM, MICROSTEPS);
 stepper.enable();
 stepper.setSpeedProfile(stepper.LINEAR_SPEED, MOTOR_ACCEL, MOTOR_DECEL);
}

void loop() {
  {INPUTS();} //Check the Simconnect and "keys" section for any input pins
  {OTHER();}// Check for "Other" things to do. (Non extraction stuff)
  if (Serial.available()) {
    CodeIn = getChar();
    if (CodeIn == '=') {EQUALS();} // The first identifier is "="
    if (CodeIn == '<') {LESSTHAN();}// The first identifier is "<"
    if (CodeIn == '?') {QUESTION();}// The first identifier is "?"
    if (CodeIn == '/') {SLASH();}// The first identifier is "/" (Annunciators)
  }
} // end of void loop (The main one)

char getChar()// Get a character from the serial buffer
{
  while(Serial.available() == 0);// wait for data
  return((char)Serial.read());// Thanks Doug
}// end of getchar void. 

void OTHER(){
/* In here you would put code that uses other data that
cant be put into an "extraction void" that references something else.
Also in here you would put code to do something that was not
relying on a current extraction trigger.
Or ,, you could just put it all in the main "void loop" and not worry about this "other void" at all.
*/
}// end of "other" void

void EQUALS(){      // The first identifier was "="
 CodeIn = getChar(); // Get the second identifier
  switch(CodeIn) {// Now lets find what to do with it
     
    case 'B':
       //Do something
    break;
    
         //etc etc etc
     }
}// end of equals loop

void LESSTHAN(){    // The first identifier was "<"
CodeIn = getChar(); // Get the second identifier
  switch(CodeIn) {// Now lets find what to do with it
   case 'P'://The second identifier was an "A"
   {
     airspeed = "";
     airspeed += getChar();
     airspeed += getChar();
     airspeed += getChar();
     a = airspeed.toFloat();
     a2 = a * 3.9;    
     if (a2 != oldas)
     {
       b = oldas - a2;
       stepper.rotate(b);
       oldas = a2;
     }
   }
   break;
   case 'A'://The second identifier was an "A"
       {
        
       }
    break;
     
    case 'B':
       //Do something
    break;
       //etc etc etc
     }
}// end of lessthan void

void QUESTION(){    // The first identifier was "?"
CodeIn = getChar(); // Get the second identifier
  switch(CodeIn) {// Now lets find what to do with it
    case 'A'://The second identifier was an "A"
       //Do something
    break;
     
    case 'B':
       //Do something
    break;
     
    case 'Y': // found the second identifier (the "Gear simple")
    break;
         //etc etc etc
     }
}// end of question void

void SLASH(){    // The first identifier was "/" (Annunciator)
  //Do something (See the other voids for layout)
} // end of slash void

void INPUTS() // Simconnect codes and "Keys" section
{
  Kstringnewstate = "";
  for (int KpinNo = 8; KpinNo < 70; KpinNo++){ //set to the input pins. (pins 8 to 70 ,, change the 70 to 19 for Uno cards)
    KpinStateSTR = String(digitalRead(KpinNo)); 
    KoldpinStateSTR = String(Kstringoldstate.charAt(KpinNo - 8));// set to the first pin read (The 8)
    if (KpinStateSTR != KoldpinStateSTR)// checks if it's different to the last reading of that pinNo
    {
      if (KpinNo != 13){ // avoid using pin 13 as an input unless you know the tricks.
        if (KpinNo == 8 && KpinStateSTR == "0"){Serial.println ("C01");} //sets gear handle up
        if (KpinNo == 9 && KpinStateSTR == "0"){Serial.println ("C02");} //sets gear handle down
        if (KpinNo == 10 && KpinStateSTR == "0"){Serial.println ("C15");} //Decrements flap handle position
        if (KpinNo == 11 && KpinStateSTR == "0"){Serial.println ("C14");} //Increments flap handle position
        if (KpinNo == 12 && KpinStateSTR == "0"){Serial.println ("A02");} //Increments COM1sb by one MHz
        if (KpinNo == 14 && KpinStateSTR == "0"){Serial.println ("A01");} //Decrements COM1sb by one MHz
        if (KpinNo == 15 && KpinStateSTR == "0"){Serial.println ("A426543");} //Sets transponder code to 6543
        //  Add more here but remember to change the figure in the next line down. (the 15)
        if (KpinNo > 15){ //Change pinNo number to same as the highest one used for simconnect codes.(the 15)
        Serial.print ("D"); 
      if (KpinNo < 10) Serial.print ("0");
      Serial.print (KpinNo);
      Serial.println (KpinStateSTR);
        }//end of 'its pinNo is greater than 12' 
      }//end of 'its not pin 13'
    }//end of 'its different'       
    Kstringnewstate += KpinStateSTR;
  }//end of 'for' loop (read the pins)
  Kstringoldstate = Kstringnewstate;
}//end of INPUTS void