RE: New CDI - opensource project JMJ and Bigboat
 

I think u do understand mi correctli:In normal moude on pin.9(strobe) we have the copy of the pin.6(outpu).I use pin.9 to stop
the HV converter, based on 555timer,becouse you need 0 volt on cap to close the thyristor after spark.But in test I have signal only on pin.6 and on pin.9 -0volt so I can't deactivate HV converter.So in test on pin.9 I need to have the same signal that I have on pin .6

RE: New CDI - opensource project JMJ and Bigboat
 

In the code above I add a few lines *bcf strobe*, so the strobe have to work also in test mode.

RE: New CDI - opensource project JMJ and Bigboat
 

No any resulte.

RE: New CDI - opensource project JMJ and Bigboat
 

Hi Rob,
Any news about your last R&D ? with new coil ? maybe new bobine ?

RE: New CDI - opensource project JMJ and Bigboat
 

@Dino, The coil we have order can't handle rpm's above 20.000.
For normal weedeather-engines it isn't bad, but for high performance engines you can't use them.
Now we try a moped coil from Hela / Bosch, the coil cost 55 euro, but can handle more then 35.000 rpm.
I hope I can find a other (internet) store who sell bobines for a lower price.

@IURA, please spent a e-mail to JMJ with your question, he is the programmer and auteur of the CDI your building.

RE: New CDI - opensource project JMJ and Bigboat
 

OK. About HV coil:Imade it from the old flayback transformer .Better the old generation of tvset:more easy to rebild.Can use the same ferrit and secondary coil.The primery about 10-15 wind.Ihave about 11000v on 8100rpm,the tention on the store cap.about 90v

RE: New CDI - opensource project JMJ and Bigboat
 

What year of TV set was the coil in? thanks Capt,n

RE: New CDI - opensource project JMJ and Bigboat
 

Summer 1912. ;)

RE: New CDI - opensource project JMJ and Bigboat
 

Dino...You sure it was 1912.....or 1876! HA HA

RE: New CDI - opensource project JMJ and Bigboat
 

BigBoat, thank you very much. I've build yours ignition. Test function work's great, I have a two kinds of flashing- fast or slow. If I remove jumpers from 8 and 9 legs of PIC controller it becomes to flashing in a third mode, frequency a little higher than slow test mode (I think 3 or 4 sparks per second). It does not work with Hall sensor. What I did wrong?

RE: New CDI - opensource project JMJ and Bigboat
 

BTW, I'll try to share my experience. For programming I use "Extra-Pic" programmer and WinPic software. With IC-prog it unable to get any good results, I do not know why. Im sorry, my English is poor, just look at the pictures below.

RE: New CDI - opensource project JMJ and Bigboat
 

Hi Nikolay,

First of all.....John-Magne was started to build a cdi, I (and others) impove his designe......but he was doing the biggest job.

Great to hear your cdi is working and it looks good to me.
I didn't know why you get / have 3 differend kinds of testsparks.
Maybe it will be *lost ocsilaor spikes* who tricker the triac becourse non of the pins are connected to ground OR positive voltage.

RE: New CDI - opensource project JMJ and Bigboat
 

Thank you for answer, Rob. I've started to build oscilloscope (http://www.transmic.net/gbindex.htm) for searching that *lost ocsilator spikes*. One more question: may I use magnet from broken brushless airplane motor for Hall sensor? This magnets looks strong enought.

RE: New CDI - opensource project JMJ and Bigboat
 

You can use all kinds of magnets if the hallsensor can *see* this magnet with the distance your using between the magnet and the hallsensor.

RE: New CDI - opensource project JMJ and Bigboat
 

HI Rob. I have a small problem. I don't know how, but I've burned PIC. [:'(]I will replace it tomorrow, but I find interesting thing. In this condition (see picture below) it still generate sparks with frequency about 1 Hz. What is burned else? Transformer is OK, 260-270 volts on L1.

RE: New CDI - opensource project JMJ and Bigboat
 

I think you blowup the diode or your thyristor.
If the diode is burned, it's possible a high voltage loopsback to your batteryvoltage of 5 Volt.
If the gate of your thyristor is burned, it's possible he will make his own ignitionsparks.
If the gate is broken, a high voltage can be loopback to your PIC.

RE: New CDI - opensource project JMJ and Bigboat
 

Thank's Rob. I've changed controller, LP2950 (it has only 3,7 Volts out) and BT 151. By the way, here available two kinds of BT 151, one for 500 volts (Philips), other 800 volts. Burned was 500, now I install 800 volts.
My "small problem" is closed. Everything is working...... but only in test mode [:@] . I think it's time for me to research deeper this problem. Rob! Please describe me step by step the way from excel sheet to ready .hex file.

RE: New CDI - opensource project JMJ and Bigboat
 

Hello Rob:

I congratulate you and your parteners in the RC CDI Ignition project. It is nice to see someone share the knowledge they have gained over the years with other people.

Well Done.

Sorry for my poor English I live in Brazil and here English language are not usual.

I have built your old project whith PIC 16f84. CDI works well on the bench in test hi and lo modes and with magnet mounted to an electric flywheel the hall sensor fires the circuit well also. I mounted this CDI in an Stihl 63 cc 2 stroke engine successfully!

Currently I’m mounting a CDI for my Lada Niva 1991, 4 cylinder 1600 cc, originally the system are with a breaker point and condenser. I used your project with two Pic 16f84 to generate two signals with two Hall sensors because I need to use two coils I modified the circuit after the PIN 6 of the PIC where I used one opto TIL 111 and the system of the Gompy for the last version of its NewCDI. In that case I have some doubts and I would like to know if you can help me.


In that page http://www.modelbouw.gompy.net/newcdi/newcdi.htm the schematics below use a C7 capacitor with turned terminals (positive in the negative and negative in the positive)? Or its correct?

Its possible to use the same project to put two input signals in one PIC an two output signals to?

In the program its possible to use RPM below 1000 RPM, because my car usually have low running at engine at 800 RPM?
Do you have some suggestion for my project?


Thanks,


Regards,



André Milke

RE: New CDI - opensource project JMJ and Bigboat
 

Hi Andre,

C7 is correct, the C will be charge from the coil, not loaded from the battery +.

You can use the *newCDI* also for a 2/3 or 4 cilinder if you modify the output after pin 6 (or singal C3-R4)
You only need more hallsensors to detect the cilinder to ignite at the right time and a PIC to send the signal (ignition) to the right cilinder.
If you use a two cilinder, you only need two magnets and one hallsensor becourse the feul don't ignite into a cilinser if the piston is down.

With more cilinders I think you can do it at this way:

Pin 6 into a other PIC
Two or more hallsensors to the other PIC to detect the right cilinder.
Two or more outputs from the other PIC to send the ignition for the right cilinder.
You need two or more HV-coils (spark-coils) and two or more thyristors.
The HV-ocsilaor (300-600 Volt part) you can use them for all.

RE: New CDI - opensource project JMJ and Bigboat
 

Hi Rob:

Thanks for your help.

Atached one picture for my project with two Pics and Power output. Sorry because the poor quality for the picture made by clelular phone.

Regards

André Milke

RE: New CDI - opensource project JMJ and Bigboat
 

Rob and All:

People I cant send drawings for my project, schematics and PCB layout.

If it will have interest I can send the original archives.

Regards

André Milke

RE: New CDI - opensource project JMJ and Bigboat
 

Wow, very nice project! Thank you for sharing it!

I am considering this project for a ~200cc, manual start, 4-cycle engine. I would like to use the camshaft, instead of the crankshaft, for timing information since there is no point in firing the sparkplug on every revolution. This will mean that 20° of camshaft rotation = 40° of crankshaft rotation and 2000 rpm at the camshaft = 4000 rpm at the crankshaft.

I have no problems with the mechanical or electronic aspect of the project but I am not good with the software side of it. Let me see if I understand what is going on: There is a magnet that triggers the hall sensor before the maximum advance for the engine. The PIC senses this point and then delays the spark according to engine rpm and the timing curve programmed into the PIC. Is this correct? If so, I have one question: It seems that the magnet has to pass the hall sensor twice to determine the rpm of the engine. For my 4-cycle idea, it would have to rotate four times since I’m looking at the camshaft. Since my engine only turns over once with the manual starter, it would never fire since four rotations are needed to determine rpm. If I fire a 200cc engine at ~40° BTDC then I run a huge risk of a backfire and damage. Am I on target with this?

RE: New CDI - opensource project JMJ and Bigboat
 

Hello, i have build this CDI, very good spark on my NGK CM6 spark plug,
but i need a new coil, how many wind of the thick wire and the thin wire?

Just now i have 100 turn of the thick wire and 3150 turn of the thin wire... but how many turn have you? i have ~315V (TRMS) from the CDI... the spark plug i will apply is NGK ME-8, spark gap is 0.4mm

Sorry for my English...

//Mikael, in Sweden

RE: New CDI - opensource project JMJ and Bigboat
 

If you mean a homemade ignitioncoil, you can take a look overhere http://home.online.no/~jon-mj/homemade_coil.htm
I use a Zenoah sparkcoil, but also some moppedcoils will doit.

RE: New CDI - opensource project JMJ and Bigboat
 

hello,

"Use all the thin wire from the transformer" how many turn is that? :)
all moppedcoils is too big for my RC plane... weight, weight, weight....

the engine i have is a 2 stroke ASP S91A

Displacement:14.95cc
RPM range:2,000-17,000(r.p.m)
Output: 2.10/16,000(kw/r.p.m)

thanks for a good work!