A Hovercraft

Projects Discussion and Showcase Robotics
1

Help me with identifying what the problem(s) is in this code for a hovercraft.

int m2 = A2;
int p1 = 1;
int f1 = A1;
int f3 = A3;
int m1 = A5;
// There are two motors with transistors (tip120) on the + lead as a esc on pins A2 and A5.
// A Piezo on pin D1 for the warning.
//And the fans are two to a transistor on pins A1 and A3.
//Written by: Lukas Severinghaus on 4/18/12.
void setup(){}
void loop(){
goto "start";
goto "Forward";
goto "turn";
goto "forward";
goto "STOP";
}
void "start"(){
HIGH = p1;
delay(2500);
LOW = p1;
analogWrite(f1, 255);
analogWrite(f2, 255);
}
void "Forward"(){
analogWrite(m1, 255);
analogWrite(m2, 255);
delay(2000);
analogWrite(m1, 0);
analogWrite(m2, 0);
}
void "turn"(){
analogWrite(m2, 200);
delay(2500);
analogWrite(m2, 0);
}

void "STOP"(){
HIGH = p1;
delay(5000);
LOW = p1;
analogWrite(f1, 0);
analogWrite(f2, 0);
}

2

Perhaps you should tell us what exactly is not working with it, rather than leaving us to guess?

3

There is so much wrong there, I have to ask. Have you looked at any of the example sketches? Or any of the tutorial pages? Or any other C programs?

goto "start";
goto "Forward";
goto "turn";
goto "forward";
goto "STOP";

You can't goto a character literal. Even if you could, you wouldn't goto a function anyway, you would just call it.

void "start"(){

Function names are not character literals.

  HIGH = p1;

You can't assign a variable to a constant.

Look at the examples in the IDE. Google for C tutorial and learn some basics.

4

Help me with identifying what the problem(s) is in this code for a hovercraft.

The major problem is that the code is not written in C. I don't know what language it is written in but it is defiantly not C and as such will not run on the arduino.

You also have not defined any pins as outputs so you can never control anything.

5

my interpretation of your code to something that compiles, don't have a clue if it does what you want but it might help you

int m2 = A2;
int p1 = 1;
int f1 = A1;
int f2 = A3;
int m1 = A5;

void setup()
{
  start();
  forward();
  turn();
  forward();
  stop();
}

void loop()
{

}

void start()
{
  digitalWrite(p1, HIGH);
  delay(2500);
  digitalWrite(p1, LOW);
  analogWrite(f1, 255);
  analogWrite(f2, 255);
}

void forward()
{
  analogWrite(m1, 255);
  analogWrite(m2, 255);
  delay(2000);
  analogWrite(m1, 0);
  analogWrite(m2, 0);
}

void turn()
{
  analogWrite(m2, 200);
  delay(2500);
  analogWrite(m2, 0);
}


void stop()
{
  digitalWrite(p1, HIGH);
  delay(2500);
  digitalWrite(p1, LOW);
  analogWrite(f1, 0);
  analogWrite(f2, 0);
}

Looking at the quality of your code I advice you to spend a day or 5 on the tutorial section of Arduino to get familiar how to code it. It seems like a lot of time but it will be worth it as you will learn all the fundamentals how to program the A.

And if you serious want to control a hovercraft you should learn to code without delay() function as it blocks your system from new commands.

Succes.

6 
int p1 = 1;

This implies you are trying to use pin 1 as an output. This is used by the serial communications along with pin 0. Pick another pin.

7

The analog pins A2,A1,A3, A5 are for analogRead() only. To use analogWrite(), use Digital pin 3,5,6,9,10,11. Look at your UNO closely, and see the ~ <-- the tiny wave character. That indicate the PWM pins for an analogWrite().

I look at the original program, it look like a BASIC program... Arduino use C++ variant. Don't think BASIC when coding the Arduino, Think C++.

What are you trying to do ? The motors are control by a relay ? A transistor using a PWM wave to control the motors ?

I agree with Grumpy_Mike here about pin 1. For me, I never use pin 0, 1 and 13. Specialy digital pin 0 and pin 1. To me, they call "Someone using the bathroom / toilet" pins :grin: So you don't use the bathroom / toilet when someone is inside.