OMG!! Guys, I don't know how to thank you enough. Both the ON and OFF signals work perfectly. I have just tested them with the valves and it does as it should.

One thing I don't understand is, why they bumped the signal up to 12v. I just tried it directly from the Arduino at 5v and it still worked.

You guys are amazing.

Mike.

void setup() {
  // put your setup code here, to run once:
pinMode (1, OUTPUT);
Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  Serial.write(0x56);
  Serial.write(0x31);
  Serial.write(0x0A);

  delay(2000);

  Serial.write(0x56);
  Serial.write(0x30);
  Serial.write(0x0A);

  delay(2000);

}

 

If anyone is interested? Here is the code for my project. Next project is to add geofencing and time-based events.

Mike.

const int  buttonPin = 2;    // The pin that the pushbutton is attached to
const int valvepin = 1;      // The pin that the valves are attached to



// Variables will change:
int buttonState;         // Current state of the button
int lastButtonState;     // Previous state of the button
bool valveStatus;





void setup()
{
  Serial.begin(9600);          //  Setup serial
  // Initialize the button pin as a input with pullup, active low
  pinMode(buttonPin, INPUT_PULLUP);
  //Initialize button states
  buttonState = digitalRead(buttonPin);
  lastButtonState = buttonState;

  Serial.println("Exhaust Valves ");

}

void loop()
{
  // Read the pushbutton input pin:
  buttonState = digitalRead(buttonPin);

  // Compare the buttonState to its previous state
  if (buttonState != lastButtonState) //Changed
  {
    if (buttonState == LOW) //New press, so change servo flag
    {
      valveStatus = !valveStatus;
    }
    delay(50);
  }

  lastButtonState = buttonState; // Save the current state as the last state, for next time through the loop


  if (valveStatus) //Positions the valve
  {
    Serial.write(0x56);
    Serial.write(0x31);
    Serial.write(0x0A);
  
    Serial.print("Valve Status: ");
    Serial.print(" Valve Open");
    Serial.println(" (Loud Mode)");

    {


    }
  }    else
  {
    Serial.write(0x56);
    Serial.write(0x30);
    Serial.write(0x0A);

    Serial.print("Valve Status: ");
    Serial.print(" Valve Closed");
    Serial.println(" (Quiet Mode)");

  }
}

 

One thing I don't understand is, why they bumped the signal up to 12v.

Just a guess, but perhaps to combat any EMI pickup on the signal wire? Or it could be that the controller sends a 3V signal to switch an open collector/drain transistor which has a pull-up to the 12V supply.

 

There are 2 separate valves controlled off of the same pin, then it's split into 2 separate circuits. Maybe it was easier to bump it up to 12v to keep a strong signal.

 

hi s200.
For long cable runs in 'electrically noisy' environments, a higher voltage signal is less prone to interference.
E

 

The real RS232C spec actually had levels from -3 to -25 and +3 to +25 V. In modern times, you seldom see more than +-12 V.
You can "sometimes" use RS422 signals to communicate with RS232 devices with some wiring changes. Old MAC's had no trouble communicating with modems. I did have one RS232 device that "required" an active RS422 to RS232 converter. The real R232 interface to Bell Telephone modems actually had 25 pins.

 

HI!
It might be LIN bus.

 

Hi S200Bym !
Great project, so you've just connected one of the three valve pins to the arduino without pumping to 12 V ?
Could you please share the pins of the SBS actuator (12v,GND,Data ?), so which pin is what ?
How's your final hardware looking like ?? I'd appreciate any answer !!!!! Thanks

 

Hi S200Bym,
looks like I am also stuck at a point where I can see a serial 12V signal with 20kbit , but how could I decode it ?
I have recorded the signal with a datalogger and put it into a CSV file.

Is there any software where I could get the real sequence to replicate and send it onto the bus ?

THX
Alex

OMG!! Guys, I don't know how to thank you enough. Both the ON and OFF signals work perfectly. I have just tested them with the valves and it does as it should.

One thing I don't understand is, why they bumped the signal up to 12v. I just tried it directly from the Arduino at 5v and it still worked.

You guys are amazing.

Mike.

void setup() {
  // put your setup code here, to run once:
pinMode (1, OUTPUT);
Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  Serial.write(0x56);
  Serial.write(0x31);
  Serial.write(0x0A);

  delay(2000);

  Serial.write(0x56);
  Serial.write(0x30);
  Serial.write(0x0A);

  delay(2000);

}