Troubleshooting Float

Forum 2005-2010 (read only) Software Syntax & Programs
1

I am new at this and I am trying to simply display decimal values at the serial output. I am having problems with the float variable. can someone help??

#define sensorA 3 // Button 1 at pin3
#define sensorB 4 // button 2 at pin4

int s1 = 1;
int s2 = 1;
const int ledPin = 13;
int s1old = 1; // old state of buttom 1
int s2old = 1; // old state of button 2

int count = 0; // this value will be increased/decreased
int x = 12.56; // constant arc length in inch
bool s1active = false;
bool s2active = false;

void setup()
{
pinMode(sensorA,INPUT);
digitalWrite(sensorA,HIGH); //pull up on
pinMode(sensorB,INPUT);
digitalWrite(sensorB,HIGH); // pull up on
Serial.begin(9600);

}

void loop()
{

s1 = digitalRead(sensorA);
s2 = digitalRead(sensorB);
if (s1old == 1 && s1 == 0) s1active = true; // just pressed
else s1active = false;
if (s2old == 1 && s2 == 0) s2active = true; // just pressed
else s2active = false;
if (s1==0 && !s1active && s2active) count += x;

Serial.print(" Cable Used in inches: ");
Serial.println(count, DEC);
{
if ((count,) % 1 == 0) {
digitalWrite(ledPin, 1);
delay(250);
} else {
digitalWrite(ledPin, 0);
delay(250);
}
}
}

2

I am having problems with the float variable

Which are...?

You haven't got any floats.
"int x = 12.56;" is invalid.
"float x = 12.56;" isn't.

Please use the "code" (#)button when posting code

3

I am still having the float problem. I am not sure how to implement the float variable. :frowning:

#define sensorA 3 // Button 1 at pin3
#define sensorB 4 // button 2 at pin4

int s1 = 1;
int s2 = 1;
const int ledPin = 13; 
int s1old = 1; // old state of buttom 1
int s2old = 1; // old state of button 2

int count  = 0; // this value will be increased/decreased
int count1 = 0;
int count2 = 0;


float x = 12.56; // constant arc length in inch
float y = 1.047;  // constant arc length in feet
float z = 0.319;  // constant arc length in meters


bool s1active = false;
bool s2active = false;

void setup()
{
  pinMode(sensorA,INPUT);
  digitalWrite(sensorA,HIGH); //pull up on
  pinMode(sensorB,INPUT);
  digitalWrite(sensorB,HIGH); // pull up on
  Serial.begin(9600);
  
  }

void loop()
{

  s1 = digitalRead(sensorA);
  s2 = digitalRead(sensorB);
  if (s1old == 1 && s1 == 0) s1active = true; // just pressed
  else s1active = false;
  if (s2old == 1 && s2 == 0) s2active = true; // just pressed
  else s2active = false;
  if (s1==0  && !s1active && s2active) count += x;

  Serial.print(" Cable Used in inches:  ");
  Serial.println((float)count, DEC); 
  
  if (s1==0  && !s1active && s2active) count1 += y;
  Serial.print(" Cable Used in feet:  ");
  Serial.println((float)count1, DEC); 
  
  if (s1==0  && !s1active && s2active) count2 += z;
  Serial.print(" Cable Used in meters:  ");
  Serial.println((float)count2, DEC); 
    
  if (s2==0  && !s2active && s1active) 
  count -= x, count1 -= y, count2 -= z;
  s1old = s1; // remember the last state
  s2old = s2; // remember the last state
   
 {
 if ((count, count1,count2) % 1 == 0) {
    digitalWrite(ledPin, 1);
    delay(250);
  } else {
   digitalWrite(ledPin, 0);
   delay(250);
  }
 } 
}
4

try declaring your count variables as float instead of int

5

I have tried that but i still get rounded values, i need to get values up to 3 decimal places at least.

6

I presume you got values to two decimal places when your count variables were floats. If so, why did you put that back to ints?

Floats on arduino are accurate to around 7 decimal places but the print routine only shows two.

7

I figured out the problem in my code, I had to use float for the count and the x, y, z values. But the reason i wasnt getting any decimal numbers on my output was because I had to remove "DEC" from my println function. now the program is running fine. thank you all