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1  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!
2  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
3  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!
4  Using Arduino / General Electronics / Re: RS232 Transciver on: May 23, 2013, 04:02:28 pm
Thanks on help this look's great!!!
5  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!
6  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?


7  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!
8  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);
      }
    } 
  }
9  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
10  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!
11  Using Arduino / General Electronics / Re: DC DC step down converter for smart battery charger on: April 14, 2013, 10:47:21 am
Ambitious project. You will have to come up with a independent current measurement and output voltage measurement to feedback to your 'smart controller'.

Also you said 5 amps should be enough? The specs on that regulator is 3 amps max and then only if you add heatsinking and keep the voltage/current product (actual wattage delivered to the charging load) at less then 15 watts.

Study and understand the limiting factors in the following specifications they give you:


Code:
Output Current: Max 3A ( If more than 15W, please install the heat sink, this item do not include heat sink)
Constant current range :0-3A (adjustable)
Minimum voltage pressure: 2V
Output power: natural cooling 15W


Lefty

Hi!

I just put this one as an example, I know how to measure current and voltage only thing what I need is schematics of some step down dc dc converter which can regulate current!
12  Using Arduino / General Electronics / Re: 2 CDI's on one motorcycle on: April 14, 2013, 09:15:56 am
I think it would work, but not very well, especially in the mid-range.  It is not likely that the advance curve will match the engine, exhaust, carb, or the power valves.  2-strokes are a tuned system.  You can't just make dramatic changes in one area and not make matching changes elsewhere.

Have you looked into other alternatives like using a YZ125 or KTM 125 ignition, or is the TDR produced in other countries with more power?  What about the UK version?

2 strokes doesn't need advance curve, most of them have fixed ignition like my Yamaha wheri it's 17 degrees BTC.

I already put the DC CDI on my bike, and it worked but problem is that my bike have valve in exhaust which gives him power at low rpms so with only DC CDI it goes grat above 6.5k rpm, but below is literally dead.

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!
13  Using Arduino / General Electronics / DC DC step down converter for smart battery charger on: April 14, 2013, 07:34:31 am
Hi all!

I come up to the idea to use transformer from my old PC power supply to build the smart battery charger.

This is how I'm planing to realize it:
It's going to have have potentiometer for setting the current!
I found lot's of schematics on internet with using some linear regulators but, but on ebay you can buy something like this very cheap:
http://www.ebay.com/itm/DC-Step-Down-Power-Supply-Buck-Converter-Charger-Constant-Current-LED-Driver-/350751846916?pt=LH_DefaultDomain_0&hash=item51aa707204
But I'm planing to do whole board on my own so is there any schematics which uses this switching regulators with current regulation? I think that 5A max. current would be enough!

Also this charger will have desulfation option, but I already found schematic for that and also it will have LCD screen on which there will be showed how much is the current, also voltage of the battery and current state of charging.

Thanks!

                                      Josip
14  Using Arduino / General Electronics / Re: 2 CDI's on one motorcycle on: April 14, 2013, 04:13:32 am
Ahhh, makes sense (actually, not very sensible).  Then he would leave the output that normally drives the coil floating, not grounded.

However, if this has an electronically controlled exhaust valve, then the operation of that valve must be properly timed with the ignition advance curve, or there will be no advantage to adding a 2nd CDI.  In fact, it would more than likely cause the bike to run slower.  2-stroke rev limiters work by retarding the ignition slightly at an RPM long after the engine can make maximum power anyway.  There is just no sense in defeating it.

My son is a national pro level off-road rider.  We have never even dreamed of trying to defeat the rev limiter on his bikes, and yes, he does ride 2-strokes.  Not even the top Supercross riders ride without rev limiters.  They even ride 4-strokes where the rev-limiter just cut's off the ignition altogether and still they are not tempted to defeat it.

I can't see any reason to go that route, not even on a street bike or a road racer.

This seems like an ill-advised modification if that is what the OP is trying to do.

That is what I need!

Let me explain.

Bike is Yamaha TDR 125.

Problem with my bike is that it naturaly have about 30 hp, but it's bought in Germany and there all similar bikes are restricted to 15hp so that you can ride it with 16. But in my country there is no such a rule.

Problem is in the CDI and the stator, cdi retards ignition a little bit, and stator gives weaker pulse also.

So I'm planing tu put the DC CDI which works on 12V for spark. I would leave everything as it is now, but only split the wire which comes from trigger and one pole connect to the old CDI and other one into the DC CDI. And leace output from original CDI floating?

Would this work?

Thanks!
15  Using Arduino / General Electronics / 2 CDI's on one motorcycle on: April 11, 2013, 07:01:32 am
Hi all!

I have the 2 stroke motorcycle which have restriction on CDI and stator which couldn't be removed. Problem is that CDI is also responsible for controlling the valve in the exhaust. And I've come up to the idea, to buy cheap DC CDI frome some scooter nd use that CDI for creating spark and leave original CDI to control the valve.

Thing what I don't know, is: should I put output for ignition coil from my original CDI to ground, and should I do that using the resistor, and would that thing work, or it will be there some white smoke?

Thanks!
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