Mover Simulated Wind Arduino Sketch

So, here's some code to control the fans with the Arduino.
Needs to be adapted to your controller.
That's what @SilentChill is using.

The code expects 8 bit values, so use the following simple direct module:

We are mapping 0 m/s to bit value 0
70 m/s (+-250 km/h) to bit value 255 (the maximum speed)
Any speed above 70 m/s will always output bit 255.

I'm using Speed as the value. But in DCS for example, we have the wind value also.
The wind value in DCS looks for the amount of the cockpit open and calculates the amount of wind from that.
So not all values are available.

Add a serial output with:

Select the correct port

Moderator Edit: Raw code in case the zip file does not work correctly:

Code:

#define BRAKEVCC 0
#define CW   1
#define CCW  2
#define BRAKEGND 3
#define CS_THRESHOLD 100

int inApin[2] = {7, 4};  // INA: Clockwise input
int inBpin[2] = {8, 9}; // INB: Counter-clockwise input
int pwmpin[2] = {5, 6}; // PWM input
int cspin[2] = {2, 3}; // CS: Current sense ANALOG input
int enpin[2] = {0, 1}; // EN: Status of switches output (Analog pin)
int statpin = 13;


void setup()
{
  Serial.begin(115200);
  pinMode(statpin, OUTPUT);

  // Initialize digital pins as outputs
  for (int i=0; i<2; i++)
  {
    pinMode(inApin[i], OUTPUT);
    pinMode(inBpin[i], OUTPUT);
    pinMode(pwmpin[i], OUTPUT);
    pinMode(pwmpin[i], 0);
    analogWrite(pwmpin[i], 0);
  }
 
  // Initialize braked
  for (int i=0; i<2; i++)
  {
    digitalWrite(inApin[i], LOW);
    digitalWrite(inBpin[i], LOW);
  }
}

void loop()
{
//TCCR0B = TCCR0B & B11111000 | B00000001;    // set timer 0 divisor to     1 for PWM frequency of 62500.00 Hz
  TCCR0B = TCCR0B & B11111000 | B00000010;    // set timer 0 divisor to     8 for PWM frequency of  7812.50 Hz

  if (Serial.available())
  {
    uint8_t Speed=Serial.read();
    if(Speed>0)
    {     
      motorGo(0, CW, Speed);     
      motorGo(1, CW, Speed);   
    }
    else if(Speed==0)
    {
      motorOff(0);
      motorOff(1);
    }
  }
}

void motorOff(int motor)
{
  digitalWrite(inApin[motor], LOW);
  digitalWrite(inBpin[motor], LOW);
  analogWrite(pwmpin[motor], 0);
}
    
void motorGo(uint8_t motor, uint8_t direct, uint8_t Speed)
{
  if (motor <= 1)
  {
    if (direct <=4)
    {
      // Set inA[motor]
      if (direct <=1) digitalWrite(inApin[motor], HIGH);
      else digitalWrite(inApin[motor], LOW);
    
      // Set inB[motor]
      if ((direct==0)||(direct==2)) digitalWrite(inBpin[motor], HIGH);
      else digitalWrite(inBpin[motor], LOW);
    
      analogWrite(pwmpin[motor], Speed);
    }
  }
}

Success!!! The sketch works perfectly! Thanks @pmvcda and @SilentChill

good

I am trying to open the program code with Arduino IDE and it gives me an error

Cannot create program

Failed to open the sketch

can you check it please

thanks

It worked for me a few days ago and the file has not changed since.

Make sure the sketch is in its own folder, double check that you have Arduino IDE correctly installed.

EDIT: Just checked with my office PC and found that I am getting the same error. I will grab the version from my SimpitPC later today and double check that one.

You should be able to copy and paste the code into the Arduino IDE and run it. I did that and it passed the check. @djbart82

Code:

#define BRAKEVCC 0
#define CW   1
#define CCW  2
#define BRAKEGND 3
#define CS_THRESHOLD 100

int inApin[2] = {7, 4};  // INA: Clockwise input
int inBpin[2] = {8, 9}; // INB: Counter-clockwise input
int pwmpin[2] = {5, 6}; // PWM input
int cspin[2] = {2, 3}; // CS: Current sense ANALOG input
int enpin[2] = {0, 1}; // EN: Status of switches output (Analog pin)
int statpin = 13;


void setup()
{
  Serial.begin(115200);
  pinMode(statpin, OUTPUT);

  // Initialize digital pins as outputs
  for (int i=0; i<2; i++)
  {
    pinMode(inApin[i], OUTPUT);
    pinMode(inBpin[i], OUTPUT);
    pinMode(pwmpin[i], OUTPUT);
    pinMode(pwmpin[i], 0);
    analogWrite(pwmpin[i], 0);
  }
 
  // Initialize braked
  for (int i=0; i<2; i++)
  {
    digitalWrite(inApin[i], LOW);
    digitalWrite(inBpin[i], LOW);
  }
}

void loop()
{
//TCCR0B = TCCR0B & B11111000 | B00000001;    // set timer 0 divisor to     1 for PWM frequency of 62500.00 Hz
  TCCR0B = TCCR0B & B11111000 | B00000010;    // set timer 0 divisor to     8 for PWM frequency of  7812.50 Hz

  if (Serial.available())
  {
    uint8_t Speed=Serial.read();
    if(Speed>0)
    {      
      motorGo(0, CW, Speed);      
      motorGo(1, CW, Speed);    
    }
    else if(Speed==0)
    {
      motorOff(0);
      motorOff(1);
    }
  }
}

void motorOff(int motor)
{
  digitalWrite(inApin[motor], LOW);
  digitalWrite(inBpin[motor], LOW);
  analogWrite(pwmpin[motor], 0);
}
     
void motorGo(uint8_t motor, uint8_t direct, uint8_t Speed)
{
  if (motor <= 1)
  {
    if (direct <=4)
    {
      // Set inA[motor]
      if (direct <=1) digitalWrite(inApin[motor], HIGH);
      else digitalWrite(inApin[motor], LOW);
     
      // Set inB[motor]
      if ((direct==0)||(direct==2)) digitalWrite(inBpin[motor], HIGH);
      else digitalWrite(inBpin[motor], LOW);
     
      analogWrite(pwmpin[motor], Speed);
    }
  }
}

ok, thank you

i try, thank you

it's great now if it works properly

this afternoon I will mount the fans and test

thanks

I've already tried it, it works luxury

I have to test with a 12V source instead of a 5V to test the 1700rpm noctua at 100% and see how it is

Thanks for the help

Tested with a 12V source and works great with 1700rpm pwm fans

now to adjust the speed output

thanks for the sketch

Thanks @pmvcda and @SilentChill, I have 2 Fans 120 v AC and with modules M012 and M150 , works perfectly!!

Hi
it works perfectly for me.

Has someone a good idea what kind of ventilator we can use?
At the moment 1 tried 2x 14cm PC-case fans. but you can feel only a light breeze over 150km/h ;o)
It would be great if they are not to noisy

kind regards
Peer

@C1500 I use two Seaflo bilge fans. 12V, high volume. Connected to a 12v LED power supply.

@SilentChill using the arduino code above it works perfectly in DCS. One issue I have though: When I start my PC and until I start the serial output in Mover the fans run full speed. Is there a way to change the code to initialize the motors and then set them to zero until I start serial output?

Unfortunately I had to solve the issue by mechanical means. I added a DPST toggle switch before the fans so I can simply turn them off. I was hoping for a more elegant solution though.

Still, thanks again for creating the sketch in the first place.

Hi, @pmvcda
I give you a exemple ( shema) of my situation with my wind simulater .
To 0- 150 bytes I have no wind but over 150 to 255 you can see its progressif curve !
Q- How I can fitre this curve to have a strait line ( constant line ) and more stretched ?

You can use a logistic filter to generate a compensation.
Give me some time, I will show you the filter when I'm near the pc

OK, I said cubic, but I meant logistic.
I just edited the above post.

We should act in the bit output, not in the speed value, because the problem you have is at hardware level.
But we can't do that, so we have to act in the range of values we are using (would be good to do the correction at hardware level, in the code of the controller).

So I'm using an 8 bit output here (0 to 255).
And a maximum speed of 70 m/s (around 250 km/h).
So, I'm mapping the 0 to 70 speed to the 0 to 255 bits.
But has you said, there's a deadzone under around bit value of 100.
So I add 30 m/s (around bit value 108 without filter) to the received value.



So now we have value 30 m/s up to 70 m/s we want to transform with a logistic to compensate the curve you have.
So we make a logistic with maximum value of 40 (40+30=70).
The 1.6 is the "gain" of the logistic and in your case, to compensate the curve it should be above 1.0.

Now, if you look at the input/output graph, you can see that at speed zero, the output is 30 and above it, it increases on the logistic curve up to 70. All this is remapped to bits 0 to 255.

For now, this is what you can do in Mover.
I can add a logarithm filter, (i have it done but not exposed) that might make it easier, but I also consider an editable curve for the future (but not soon).

Also note that the actuator filter, acts over the value and not the bit value!
I already considered the possibility to change it, but might cause more confusion, although in this module it seems the more correct to do, in linear actuators, it makes more sense to use real measures.

Thanks a lot again !! You make my day !!
Fast and full instructions !!
You are my Tony Stark ( Ironman)/ simulator.
My set up is :

Hi, I'm not a coder but I want to have a try at building a wind sim. I have an arduino uno, and motor shield with 12v 6A power supply input, and a 12v fan plugged into the M1 output.

Could someone provide some basic details as to what I need to do to the code to get it outputting a 0-12v on my arduino motor shield?

The fan I have is just a 12v DC fan, it is not a PWM controlled fan.

Thanks