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1  Using Arduino / General Electronics / Re: DC DC inverter couple of questions on: September 08, 2014, 12:55:04 pm
There is no old transformer. Instead there is small coil and magneto which is connected to crankshaft and that coil generates that HV (~250V). So, now when that coil is dead, probably because of temperature. I've come up with idea to build 12 inverter which will replace it function.

How many amps does it need? You can't even start this job until you know that.

FWIW I don't think I've ever seen a 250V DC booster and I'm guessing they're very hard to make. 250V DC is a lot of power.

Ignition coils can be had for $25. How much of your/our time does that work out to?

http://www.ebay.com/sch/i.html?_nkw=ignition+coil+cdi+dc+boost

You misunderstood what is my problem

My ignition coil isn't dead. Dead is HV coil that generates 250V which are then sent to ignition coil.

I posted the schematics in first post of the converter. This doesn't consumes lot's of power. Because inverter needs to charger 1uF Capacitor.

In my last post I clarified what I'm planing to do.



2  Using Arduino / General Electronics / Re: DC DC inverter couple of questions on: September 08, 2014, 11:09:22 am
There is no old transformer. Instead there is small coil and magneto which is connected to crankshaft and that coil generates that HV (~250V). So, now when that coil is dead, probably because of temperature. I've come up with idea to build 12 inverter which will replace it function.
3  Using Arduino / General Electronics / Re: DC DC inverter couple of questions on: September 08, 2014, 02:06:18 am
Hi just to clarify.

The ignition coil to the spark plugs is Okay.
The transformer you are talking about is the one used in the CDI to produce the 300Vdc to switch to the Ignition Coil?

Tom...... smiley

Yes!  smiley

Josip
4  Using Arduino / General Electronics / Re: DC DC inverter couple of questions on: September 07, 2014, 02:52:38 am
Schottky diodes don't really do high voltage - and they have very bad leakage at high
temperatures, high leakage isn't good for high voltage anyway.

R11 is probably as you say to limit the heating in the transformer (or elsewhere).

MarkT

Then, can I use some fast recovery rectifier diode, let's say MR856.

But with this DC-DC converter, you still need the High voltage coil.
look at the right side of the schematic, it connect to coil.

BillHo,

I know that, I made this new schematics, and included it into first post, but somehow it wasn't visible! Here is the ling on part of schematics that I'm planing to use:
http://imgur.com/QevTxez

What should I add on this schematics to improve reliability, or varistor is enough to protect from high voltage buildup?

Thanks
5  Using Arduino / General Electronics / DC DC inverter couple of questions on: September 06, 2014, 01:35:26 pm
Hi all!

I have couple of questions regarding DC-DC converter, but first of all I would like to present you with my problem.

So thing is that i have small 2 stroke motorcycle which has  CDI ignition. But problem is that it's High voltage coil is failed and new part is very expensive, so I've come up with idea to build dc dc converter which would generate that voltage(about 250-300V).

I found this schematic on internet for the complete DC CDI, but thing is that I want to use only inverter from that circuit because I want to keep my original CDI(except spark, original CDI controls power valve in exhaust)
http://www.transmic.net/DC-CDI-v20/DC-CDI-Schematic.pdf

So this is part of the schematic that I would use:
http://imgur.com/QevTxez

My question are:
1. I was thinking of adding some voltage protection because maximum voltage taht my cdi can handle is 400V( i dismantled     one old cdi and found that capactior is 1uF and rated on 400V)
 I think that 300V would be enough so I added one varistor in schematic which should serve purpose, but I don't know is  that enough, and what else should i put?
2.On this shematic for inverter which is basically same: http://www.sportdevices.com/ignition/inverter.htm Is staded that "The last 1N4007 diode is necessary to load the capacitor with the current provided by the transformer" I was planing to replace 1N4007 with some shottky diode which are faster. On my shematic this diode should be connected beetween CDI ignition output and ground.
3. What is purpose of R11 resistor, is it there only for current limiting of transformer?

If you have any advice feel free to post because I'm not so competent in analog circuits and I would like to make this as reliable as possible.

Best regards and thanks in advance.

Josip
6  Using Arduino / General Electronics / Re: Cheap alternative to TIP117 pnp tranzistor which has same pinout on: June 03, 2013, 01:30:03 pm
I found this one on ebay and it should work:
http://www.ebay.com/itm/5Pcs-TIP127-TO-220-100V-5A-Transistor-Complementary-PNP-/130817690659?pt=LH_DefaultDomain_0&hash=item1e75578c23

So, problem is solved!
7  Using Arduino / General Electronics / Cheap alternative to TIP117 pnp tranzistor which has same pinout on: June 03, 2013, 01:20:52 pm
Hi all!

I've built pcb according to this design:
http://talkingelectronics.com/projects/100%20IC%20Circuits/Motorcycle%20Brake%20Light%20Flasher.pdf

Only problem is that I can't find TIP117 in my local store, and on ebay is delivery pretty expensive.

Thing is that I have the LED brake light which consumes less than 0.3A so I don't need anything special, just with same pinout because I'm already built the PCB. I live in Croatia so best would be to order from ebay.

Thanks
8  Development / Other Hardware Development / Will Arduino support more ARM microcontrollers? on: May 30, 2013, 08:41:07 am
I found this article about simple programing an ARM DIP chip:
http://www.meatandnetworking.com/tutorials/lpc1114fn28-with-open-source-tools/

So there are some ARM chips which are in DIP package, cheap, and faster than conventional risc chip, like atmega, etc... And it makes me wonder, are there gonna be more chips with ARM architecture which are supported by arduino libraries?

Thanks!
9  Using Arduino / General Electronics / Re: RS232 Transciver on: May 23, 2013, 04:02:28 pm
Thanks on help this look's great!!!
10  Using Arduino / General Electronics / Re: RS232 Transciver on: May 23, 2013, 03:18:41 pm
We can chose preferred baud rate between 4800,9600,19200,38400,57600,115200. Current is set to the 19200.

Is there anything in the price tag below 50-60$, this is student competition and one of the main goal is to have thing as functional as possible but relatively cheap?

And also here is the next problem, what isn't quite related to transciver: Because we have only  one rs232 port on our ECU, and I want to build little computer using arduino which will fetch data from the ECU and display it on the LCD screen, so is there any rs232 switcher or something like that?

Thanks!
11  Using Arduino / General Electronics / Re: RS232 Transciver on: May 23, 2013, 07:48:37 am
Hi sonnyyu,

thanks on help, but it's pretty expensive, are there any cheaper alternatives?


12  Using Arduino / General Electronics / RS232 Transciver on: May 23, 2013, 05:49:51 am
Hi all!

I'm working on formula student project, and we have standalone ECU which communicate with our laptop using RS232. And everything works great now, but problem is that we would like to be connected with ecu during the race because of telemetry and to see what really happens with car.

So does anyone know some kind of transciver on ebay, which range is about 1km or less, and isn't very expensive?

Thanks!
13  Using Arduino / Project Guidance / Re: Arduino and HALL sensors problem on: May 02, 2013, 02:07:01 pm
Hi adfrancois!

You mentioned that you have v strom, I think that you have the wires which are coming out of gearbox, which can be used for gear sensor so try to investigate that a little more because that principle would be better, because you don't have to use hall sensors, and it's mechanical so it's 1000% bullet proof!

This is my code, comments and some variable names are in Croatian so feel free to ask if something isn't clear:  smiley
Code:
  #include <EEPROM.h>
 
  const int brojac = 1; //clk pin 4026
  const int r=0;  //reset pin  4026
  const int n=2;
  const int gornji=3; //UP sensor
  const int donji=4;  //Down sensor
 
  int trenutnaBrzina=0; //Current gear
 
  //Adress to store in eprom current gear
  const int adresa=0;
  byte spremljenaBrzina;
 
  void Spremi(byte b)
  {
    EEPROM.write(adresa,b); 
  }
 
//Method to show number using 4026 IC
  void prikaziBroj(int broj)
  {
    if(broj>trenutnaBrzina)
    {
       for(int i=0;i<broj-trenutnaBrzina;i++)
       {
         digitalWrite(brojac,HIGH);
         digitalWrite(brojac,LOW);   
       }
       
       trenutnaBrzina=broj;
    }
    else
    {
       reset(r);
       for(int i=0;i<broj;i++)
       {
         digitalWrite(brojac,HIGH);
         digitalWrite(brojac,LOW);
       }
       trenutnaBrzina=broj;
    }
  }
 
//This method is called when UP sensor is activated
  void visa()
  {
    if(trenutnaBrzina==1)
    {
       prikaziBroj(0);
     
    }
    else if(trenutnaBrzina==0)
    {
      prikaziBroj(2);
    }
    else if(trenutnaBrzina+1 <7)
    {
      prikaziBroj(trenutnaBrzina+1);
    }
   
    Spremi(trenutnaBrzina);
   
  }

//This method is called when DOWN sensor is activated
  void niza()
  {
    if(trenutnaBrzina==0)
    {
      prikaziBroj(1);
    }
    else if(trenutnaBrzina==2)
    {
      prikaziBroj(0);
    }
    else if(trenutnaBrzina>2 && trenutnaBrzina!=1)
    {
      prikaziBroj(trenutnaBrzina-1);
    }
    Spremi(trenutnaBrzina);
   
  }
 
  //Reset 4026
  void reset(int pin)
  {
    digitalWrite(pin,HIGH); 
    digitalWrite(pin,LOW);
  }
 
  void setup()
  {
   
   pinMode(r,OUTPUT);
   digitalWrite(r,LOW);
   delay(1000);
   
   pinMode(brojac, OUTPUT);   
   pinMode(gornji,INPUT);
   pinMode(donji,INPUT);
   pinMode(n,INPUT);
   digitalWrite(n,HIGH);
   digitalWrite(gornji,HIGH);
   digitalWrite(donji,HIGH);
 
   reset(r);
 
   spremljenaBrzina=EEPROM.read(adresa);
   prikaziBroj(spremljenaBrzina);
 
  }
  //UP, DOWN, N values
  int gornjiVrij=HIGH;
  int donjiVrij=HIGH;
  int nVrij;
 
  void loop()
  {   
   
    delay(100);
    nVrij=digitalRead(n);
    if(nVrij==LOW)
    {
      prikaziBroj(0);
      delay(100);
      Spremi(0);
    }
    else
    {     
      gornjiVrij=digitalRead(gornji);
      if(gornjiVrij==LOW)
      {
        visa();
        delay(100);
      }
      delay(100);
      donjiVrij=digitalRead(donji);
      if(donjiVrij==LOW)
      {
        niza();
        delay(100);
      }
    } 
  }
14  Using Arduino / General Electronics / Re: DC DC step down converter for smart battery charger on: April 16, 2013, 02:19:12 pm
Does anyone knows?  smiley-confuse
15  Using Arduino / General Electronics / Re: 2 CDI's on one motorcycle on: April 14, 2013, 10:56:11 am
2 strokes doesn't need advance curve, most of them have fixed ignition like my Yamaha wheri it's 17 degrees BTC.

No true, not true at all.  Not since about 1980.  All my Husqvarnas and KTMs have advance curves.  Every 2T bike I've owned since my 1981 IT250 has had an advance curve.  You are very much misinformed my friend.

So my biggest concern is can I just leave wire which goes to ignition coil from original cdi unconnected and would that burn CDI, because cdi is very expensive I didn't wanted to try this before asking somebody who knows something about that!

You can do it, but it's not going to work very well.  It will not burn the CDI but it will run like maird.

My advice is that you DO NOT do this.

Then I was wrong, but that isn't matter here, because I will buy DC CDI from some other motorycle so it probably has programmable ignition. But that isn't matter, because I was made CDI according to this schematics:
http://mastercircuits.blogspot.com/2010/07/yamaha-dt125-cdi.html
And that CDI have fixed ignition curve, and I didn't notice any performance loss, also I was put CDI from some four stroke scooter which have advance curve and performance was the same.

But main thing is that I'm not gonna destroy CDI, so that is good. I will see is this work!

Thanks!
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