Gas Turbine build, pictorial build log.

[fabinho]

Hi fabinho,

Here are the schematics for the arduino board and for the RPM sensor.

The arduino board


The RPM Sensor board


I'm not sure if the max6675 module is still available, but this is a replacement http://www.adafruit.com/products/269

The arduino code...

//--------------------------------------------------------------
//
// Interrupt driven sketch to measure RPM, and Temps
// it expects a suitable signal on pin digital 2 / external int0
// Display is via LCD.
//
//--------------------------------------------------------------
#include <LiquidCrystal.h>
#include <max6675.h>
#include <Wire.h>

int thermoDO = 3;
int thermoCS = 4;
int thermoCLK = 7;

MAX6675 thermocouple(thermoCLK, thermoCS, thermoDO);

LiquidCrystal lcd(13, 12, 11, 10, 9, 8);

uint8_t degree[8]  = {140,146,146,140,128,128,128,128};

int pwmPin5 = 5;    // 976hz signal on pin 5, connected to a mosfet to drive a glowplug.
int dutycycle = 80;    // 25 = 10% duty cycle

volatile  word rpmcount;

unsigned long rpm;

unsigned long timeold;

void setup()
{
  pinMode(pwmPin5, OUTPUT);
  analogWrite(pwmPin5, dutycycle);    //turn on the glowplug output. 
  
  
  lcd.begin(20,4);              // Setup the LCD, use 16,2 for a 16x2 LCD, etc.
  lcd.clear();                  // start with a blank screen
  lcd.createChar(0, degree);
  
  attachInterrupt(0, rpm_fun, RISING);  //enable int0

  rpmcount = 0;
  rpm = 0;
  timeold = 0;
  
  delay(500);
}

void loop()
{
  lcd.setCursor(0,0);
  lcd.print("RPM: ");
  
  lcd.setCursor(0, 2);
  lcd.print("EGT:");
  
  lcd.setCursor(5,2);
  lcd.print(thermocouple.readCelsius());
  lcd.write((byte)0);
  lcd.print("C ");
  
  if (rpmcount >= 100)
  {
    //Update RPM every 100 counts, increase this for better RPM resolution,
    //decrease for faster update

    rpm = 1000000*60/(micros() - timeold)*rpmcount;
    //rpm = (micros() - timeold);
    timeold = micros();
    rpmcount = 0;
    lcd.setCursor(5,0);
    lcd.print("      ");
    lcd.setCursor(5,0);
    lcd.print(rpm);
  }
  delay (500);
}

void rpm_fun()
{
  rpmcount++;
  //Each rotation, this interrupt function is run
}

//-----------------------------------------------

If there are any questions, let me know

Regards,

Steve.

Good afternoon Steve, I made here a circuit as shown in your drawing to the glow plug more when I turn on the 12v Battery candle call and is still making connected do you have any idea what it could be?

 

[bpd115]

It is with a heavy heart that I must say my friend Steve passed away last week. He was unlike anyone I have ever met and I am blessed to have worked with him for a number of years.

I would often show others this thread and videos of the turbine he built as a testament to his brilliance. I remember when he told me he was undertaking this project I didn't even think things like this were possible to do, let alone in the shed in your backyard.

When I first met Steve I asked him what flavor of Linux he ran. His answer, "My own". I knew at that moment I had a ton to learn from him, and I did.

So tonight let's have a shot of Wild Turkey and raise our glass to a hell of a guy.

RIP my friend.

 

[fabinho]

My GOD. too bad I'm sorry from the bottom of my heart. Is a not telo between us grief. Can you tell us how this tragendia happen?

 

[bpd115]

Unfortunately he had been battling cancer for a bit.