getDistance(); is not declared error, yet the code once worked.

Projects Programming
1

My Computer Science teacher did some wizardry on this code and he never explained the values and variables used in the area of the code from void loop to delay when I asked.
This code I have attached is for calculating the distance detected by a (waterproof) ultrasonic distance sensor. The code is written to output a voltage to vibration motors (which are connected to pins on the arduino uno board). The code (once upon a time) enabled the vibration motors to vibrate on a nice fluid and smooth spectrum as the distance changed. (Stronger vibration closer, weaker vibration further).
Now though, I try recompiling the exact code I have attached here, but I get the same error that states getDistance() is not declared. Could someone please inform me on how to correct this error? I am willing to except any help.

Helmet Code Roriana.pdf (46.5 KB)

2

What makes you think this is a bootloader issue?

Please post your code, in code tags.

3

I do not think it is a bootloader issue, I just have a minor error in my code that I keeping failing at correcting. I will try to upload my code on code tags. Only an arduino uno, vibration motor, and sensor was used (besides other functionality basics). Thanks for your reply.

4

This code won't compile because you haven't defined any function named getDistance() yet used it in void loop() .
You have submitted us an image since you are new am doing it but take lesson for next time.

const int echoPin=12;
const int trigPin=11;
const int motorPin=3;

float distance=0;

void setup(){

Serial.begin(9600);

pinMode(trigPin,OUTPUT);
pinMode(echoPin,INPUT);
pinMode(motorPin,OUTPUT);
}

void loop(){

distance=distance*.9+.1*getDistance();

Serial.print(distance);
Serial.println(" in");

if(distance >10 && distance <100){

float p=(distance-10)/(100-10);

int v=(int)(255*(1-p)+50*p);

analogWrite(motorPin,v);

}

else{
analogWrite(motorPin,0);
}

delay(50);
}

Here I am adding the function below and modifying the line a little .Just copy paste this code and it should work.

const int echoPin=12;
const int trigPin=11;
const int motorPin=3;

float distance=0;

float getDistance()
{

digitalWrite(trigPin, LOW); 
delayMicroseconds(2000); 

digitalWrite(trigPin, HIGH);
delayMicroseconds(1000);

digitalWrite(trigPin, LOW); 
float duration= pulseIn(echoPin, HIGH); 

return duration*0.0133/2;
}

void setup(){

Serial.begin(9600);

pinMode(trigPin,OUTPUT);
pinMode(echoPin,INPUT);
pinMode(motorPin,OUTPUT);

}

void loop(){

distance=getDistance();

Serial.print(distance);
Serial.println(" in");

if(distance >10 && distance <100){

float p=(distance-10)/(100-10);

int v=(int)(255*(1-p)+50*p);

analogWrite(motorPin,v);

}

else{
analogWrite(motorPin,0);
}

delay(50);
}
5

I do not think it is a bootloader issue,

Then you originally posted it in the wrong place