Tutorial Arduino RevBurner driving a tachometer.

There is very little current for the signal.

I think you can use ULN2003.

Thank you so much !!

Im using arduino nano and only 1x 2.2K resistance and 1 diode...
Its alive!!!! only with 5v signal :O

Working with Project Cars but have problems with Dirt Rally Plugin

Hi @jamesdio. This tachometer code can be used in X-SIM?I can't write code

hi can you help me to driving a speedometer with gamedash

i'm very poor in coding. now i use your code with my tachometer. its work very well !!

can you help me for this speedometer

thanks

sorry for the late reply.

Yes, you can use any transistor for this application.

Does your speedometer work like tachometer which works with PWM signal?

I would like to know the specification of your speedometer.

i got it from my friend. have nothing except wire (has 1 wire for signal) i think its works with PWN signal like tachometer

I have tried coding by use your code and the gauge are works fine on 1 gauge standalone

but i still have some problem when i run 2 gauges (tacho&speedo).

the gauge can run only one (in my video speedometer run,when tachometer was crash)

can you help me

Code:

/* 
Arduino code for simple rev. burner
*/

//    This code is emulating the signal of ignition coil.
//     ex) 4 cylinder, 4-cycle engine. (2 combustion cycle/rev.)
//
//     1 rpm = 0.5 combustion cycle/min.cylinder = 1/120 combustion cycle/sec.cylinder.
//     => 1/120 Hz/cylinder (Combustion cycle = signal for ignition So, 1 combustion cycle/sec. = 1Hz)
//     => 1 rpm with 4 cylinder = 1/120 Hz/cyclinder * 4 cylinder = 1/30 Hz
//
//     => 1 RPM = 1/120 hz/cylinder
//
//    Following the formula above, Hz vaue per 1 rpm would be..
//    * 2 cylinder = 1/60 Hz
//    * 4 cylinder = 1/30 Hz
//    * 8 cylinder = 1/15 hz/rpm

// Serial parser for Interface - Output : M<Dash2>
// Serial parser for Shutdown - Output : Z00
// M : rpm              (16bit - hexadecimal output)
// Z : clear            (to clear display and max rpm value)
//
// for dashboard
// Pin D3 : STB0 - strobe
// Pin D4 : CLK - clock
// Pin D5 : DIO - data

int i;
double cylinder = 4;           // cyliner count for Tachometer.
double divideUnit = 120;         // 1/120 hz/(rpm * cylinder)
double hzPerRpm = cylinder / divideUnit;
int rpmtone;
int pinTacho = 5;
unsigned int rpm;           // holds the rpm data (0-65535 size)
unsigned int rpmmax = 5000; // retrieves from rpm live with minimum setting on initialization and Shutdown - Output
byte rpmdata = 0;           // marker that new data are available
/////////////////////////speedo///////////////////////////////
double speedhz1 = 98;     
double speedhz2 = 180;
double hzPercarspeed = speedhz1 / speedhz2;
int carspeedtone;
int pinSpeedo = 6;
unsigned int carspeed;           // holds the carspeed data (0-65535 size)
unsigned int carspeedmax = 5000; // retrieves from carspeed live with minimum setting on initialization and Shutdown - Output
byte carspeeddata = 0;           // marker that new data are available

////////////////////////////////////////////////////////////////////////////////
// INITIALIZATION
////////////////////////////////////////////////////////////////////////////////
void setup()
{
  // serial initialization
  Serial.begin(9600);
}

////////////////////////////////////////////////////////////////////////////////
///////////////////////////////// Main Loop ////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////
void loop()
{

  // read input data
  readSerialData();

  // generate signal and send to tacho
  tacho();
  // generate signal and send to Speedo
  Speedo();

}

////////////////////////////////////////////////////////////////////////////////
// Procedure: wait for complete trame
////////////////////////////////////////////////////////////////////////////////
void readSerialData()
{
  byte Data[5]={
    '0','0','0','0','0'  };

  // parse the buffer
  if (Serial.available()>4){
    Data[0]=Serial.read();                   // read command
    if (Data[0]=='Q'){                       // if carspeed data
      Data[1]=Serial.read();                 // store high byte
      Data[2]=Serial.read();                 //
      Data[3]=Serial.read();                 //
      Data[4]=Serial.read();                 // store low byte
      carspeed = NormalizeData(Data);
      carspeeddata=1;                             // we got new data!     
      if (Serial.available()>4){
        Data[0]=Serial.read();               // re-read command
      }
    }
    if (Data[0]=='M'){                       // if rpm data
      Data[1]=Serial.read();                 // store high byte
      Data[2]=Serial.read();                 //
      Data[3]=Serial.read();                 //
      Data[4]=Serial.read();                 // store low byte
      rpm = NormalizeData(Data);
      rpmdata=1;                             // we got new data!     
      if (Serial.available()>4){
        Data[0]=Serial.read();               // re-read command
      }
    }
    if (Data[0] == 'Z' ){                          // if Shutdown - Output
      Serial.flush();
    }           
  }
  if (Serial.available()>40) Serial.flush();
}

////////////////////////////////////////////////////////
void tacho()
////////////////////////////////////////////////////////
{ 
  if (rpmdata == 1) {         
    // auto set max rpm
    // with filter of negative value
    // reported from 65535 to down in some games
    if (rpm>rpmmax && rpm<50000) {
      rpmmax=rpm;
    }
  
    // rpm gauge gets messy movements below 100 rev.
    if(rpm>50000){
      rpm = 0;
    }

    // Tacho range : from 0 to 10000, we will use 0 to 320 hz.
    //rpmtone = map(rpm,0,10000,0,320);
    rpmtone = (int)(rpm * hzPerRpm);
  
    // if hz. value goes over 320, then,,
    if(rpmtone > 320) {
      rpmtone = 333;
    }

    //It is not possible to generate tones lower than 31Hz. For technical details,
    // see Brett Hagman's notes. (https://code.google.com/p/rogue-code/wiki/ToneLibraryDocumentation#Ugly_Details)
    if(rpmtone < 31) {
      rpmtone = 31;
    }

    // For debugging.
    if(rpm>500){  
      tone(pinTacho, rpmtone);
    }
    else{
      noTone(pinTacho);
    }
    ;

    rpmdata=0;
  }
}
////////////////////////////////////////////////////////
void Speedo()
////////////////////////////////////////////////////////
{ 
  if (carspeeddata == 1) {         
    // auto set max carspeed
    // with filter of negative value
    // reported from 65535 to down in some games
    if (carspeed>carspeedmax && carspeed<50000) {
      carspeedmax=carspeed;
    }
  
    // carspeed gauge gets messy movements below 100 rev.
    if(carspeed>50000){
      carspeed = 0;
    }

    // Speedo range : from 0 to 10000, we will use 0 to 320 hz.
    //carspeedtone = map(carspeed,0,10000,0,320);
    carspeedtone = (int)(carspeed * hzPercarspeed);
  
    // if hz. value goes over 320, then,,
    if(carspeedtone > 320) {
      carspeedtone = 333;
    }

    //It is not possible to generate tones lower than 31Hz. For technical details,
    // see Brett Hagman's notes. (https://code.google.com/p/rogue-code/wiki/ToneLibraryDocumentation#Ugly_Details)
    if(carspeedtone < 31) {
      carspeedtone = 31;
    }

    // For debugging.
    if(carspeed>10){  
      tone(pinSpeedo, carspeedtone);
    }
    else{
      noTone(pinSpeedo);
    }
    ;

    carspeeddata=0;
  }
}

////////////////////////////////////////////////////////////////////////////////
// Function: convert Hex to Dec
////////////////////////////////////////////////////////////////////////////////
unsigned int NormalizeData(byte x[5])
////////////////////////////////////////////////////////////////////////////////
{
  unsigned int result;

  for (int i=1; i<5; i++)
  {
    if (x[i]>47 && x[i]<58 ){   //for xA to xF
      x[i]=x[i]-48;
    }                     
    if (  x[i]>64 && x[i]<71 ){ //for x0 to x9
      x[i]=x[i]-55;             
    }
  }  
  result = (x[1]*16*16*16+x[2]*16*16+x[3]*16+x[4]);
  return result;
}

my gamedash show this sentence "the interface connected to con3 is not detected" What should I do?

I think you'd better check COM Port number on Dashboard output setting if the port number is correct or not.

Could you please stop putting this things on here!!!
My Shopping cart is getting bigger and bigger ;-)
nice Job!

I was ardunio board, the output is COM3, I imported the procedures? To the ardunio COM3 normal work,

But when I open gamedash, set the output is COM3, open the LFS, and then enter the gamedash settings, the phrase "the interface connected to con3 is not detected", then said to the ardunio COM3 BUSY,

What should I do?

any idea to make 2 gauges work together ?

Hi, I have a problem with GameDash 2.0. When I open the program I do the port settings and save but I can not setup the game name. I can not set any game to the program. And also interface output. What should I do ?

Hi Guys!, there is possible to make PWM in output? I want to drive a fan whit the RPM, like wind effect whit speed , but using RPM for get PWM in output of Arduino.
Cheers !

Hello noorbeast, I read that wind section, but I couldn't find any information or code using RPM for PWM output ,in that section show how to have wind effect but works whit speed data. Or maybe if somebody can help me whit a code for have PWM instead frequency signal (tone) in Arduino output.

Hello there!

I tried to replicate this and I'm facing weird issue I can't solve.
If someone have any idea I'd really pleased.

Here are the links to the parts I use:

• Tacho
• TIP120
• 12V 1W zener diode
• 2.2kOhm
• 12V 1A power supply

The tacho itself boots. I'm able to play with it using external buttons and such. That a good first step.
I figured out that my power source voltage is correct (12V) but the others are wrong (7.4 instead of 2.5 to 3.0V)...

I wired the Boost gauge too (based on youtube video from amstudio) and I'm getting also a weird buzzer sound, which makes it barely untestable.

I uploaded a video on youtube showing what's happening for my rig : here.

I also ordered a standard diode but It's slow shipping so I'm still testing with current zener diodes I have.
If you might have some time to look at the following video. Thanks in advance.

Hello, there is 2 type of tip120 Darlington (NPN and PNP). I am not sure what is the difference and you used . could you help?
thanks