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RE: CDI gr8flyer55 - 10/27/2012 12:11 AM  1 votes
jakestew


 

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From: Moscow, ID, USA
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quote:

ORIGINAL: nobitaemon

 Hi,
If anyone can help me.
I want to make use ATmega8 Programmable CDI
and the C language.
 
Thank you,


First off, welcome to the project! You'll find some very smart people here.

I might be able to help you with some advice, and you can look over my code. But right now we're using PICs. They come in convenient packages for our application and seem to work well.

If I were you, I'd just buy a $10-20 PIC programmer and work from the code we're using. It took quite a long time to construct the spreadsheet for generating the timing table and to write the code. I've got a lot of advanced features planned, so this project is moving very fast. John has the hardware worked out quite well, and has kits available for very cheap prices.

Everything might seem confusing at first because we don't have all the documentation and instructions worked out, but things are working well. The hardware and software both work well, and it isn't hard to get started. PM or email John (gr8flyer55) and he can set you up with the hardware. Nyemi and I both have firmware for the PIC that work well. I know the thread has gotten pretty long, but it is worth reading, and you can see what we've done.


-Jake

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RE: CDI gr8flyer55 - 10/27/2012 12:26 AM  1 votes
Gompy



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From: Alkmaar, NETHERLANDS
Status: offline 		I'm working on a HV-board we can control.
No HV when we given a spark and no more load if the capacitor is loaded.
Fast loading, 75 - 100 kHz and some more power up to 75 - 100 mJ to use with RC race engines.

Race engine have a high compression and need more mJ.
This designe is OK for 3 or 4 bar, but race engine have 8 bar and high pressure kill the spark.

But just like software do, it takes time to designe a good working HV-board.

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http://www.electronics.gompy.net

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RE: CDI gr8flyer55 - 10/27/2012 3:03 AM   
gr8flyer55


 

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Status: offline 		I compiled Nyemi's edited code. It only works correctly if you ground pin3. This means there is no longer a functioning kill switch function.

John


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RE: CDI gr8flyer55 - 10/27/2012 7:19 AM   
jakestew


 

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Status: offline 		He must have accidentally screwed something up somewhere, it's easy to do. The interrupt handling improvement is a good idea though. I'll have it incorporated tomorrow.

As far as I can tell from my tests everything is working exactly as intended. Nyemi's improvement can only help.


-Jake

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RE: CDI gr8flyer55 - 10/27/2012 2:21 PM   
gr8flyer55


 

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Status: offline 		In Nyemi's post with the attachment of the source code it states "No kill switch".
Reading the pin assignments in the source, it says pin 3 tied low. Looks to me that it was eliminated as a function.

John


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RE: CDI gr8flyer55 - 10/27/2012 10:36 PM  1 votes
nyemi


 

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From: szarvas, HUNGARY
Status: offline 		Hi John

I'm sorry.
I'm back, kill switch routine.
You be careful.
I tested.
The input of dirt, it creates the power.



Attachments
Click to see the file in new window.Attachment.txt


< Message edited by nyemi -- 10/28/2012 6:47 AM >

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RE: CDI gr8flyer55 - 10/28/2012 10:07 AM  1 votes
Gompy



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From: Alkmaar, NETHERLANDS
Status: offline 		There must be a resistor to + power of 1 kOkm to keep the pin high and 100n to ground to filter the swtchmoment.
The pin is now open and pickup dirt.

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RE: CDI gr8flyer55 - 10/28/2012 3:21 PM  1 votes
gr8flyer55


 

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Status: offline 		Thank you Nyemi !
Now we have a choice of 2 versions. I needed the kill switch option for my use.
And thanks go to Rob for his filter suggestion, it works Rob ! Just tested your filter for the switch....no more problems!

John


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RE: CDI gr8flyer55 - 10/28/2012 3:42 PM  1 votes
Gompy



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From: Alkmaar, NETHERLANDS
Status: offline 		Same to the table switch, put a resistor between power and the pin to keep the pin high.
Inside the PIC there are also pulldown resistors, but they don't work allways.
If using the intern pulldwon resoistor there will be over the pin and ground a resistant, a spike Voltage can set the pin high.
When pin high, the pin is switching, thats not wat you want, so make the pin high with a real resistor.

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RE: CDI gr8flyer55 - 10/28/2012 4:54 PM  1 votes
nyemi


 

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From: szarvas, HUNGARY
Status: offline 		Hi John
I'm glad I could help you.

I ask you, circuit diagram.
What you're using the new software.
Because 100nF capacitor, high value,  the Hall input.
Fair good value: 2,2nF-10nF
The 100nF capacitor:Change ignition timing value.(Delays in the Hall signal)!!!!
Circuit me, so working. See the picture.(I am using:4,7nF+4,7Kohm, LED, resistor, not necessary.)


You circuit, what works?



Attachments
Click to see fullsize image.
Click for fullsize


< Message edited by nyemi -- 10/28/2012 5:15 PM >

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RE: CDI gr8flyer55 - 10/28/2012 5:23 PM  1 votes
gr8flyer55


 

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Status: offline 		Nyemi, I am using a ready made ignition board, I only have to solder parts to it. I have no real schematic, but is the same as RCexl version 2 ignition. I will draw one as soon as I get time. Right now, doing repairs for customers, very busy.
Timer board is what is posted in the forum, ignition is basic RCexl CH ignition and are reliable.

John


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RE: CDI gr8flyer55 - 10/28/2012 5:40 PM   
nyemi


 

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From: szarvas, HUNGARY
Status: offline 		I see. Thank you.
Your circuit is working, Jake Code?
There is no problem?

You feel the difference between the two codes?
I take criticism.


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RE: CDI gr8flyer55 - 10/28/2012 8:01 PM   
gr8flyer55


 

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Status: offline 		Nyemi, your code is working very good!
Jake's code sometimes makes a misfire at high speed and timing changes slightly. Both work but your sensor input routine is more reliable for this circuit. I added Rob's switch filters to be sure of no problems and it works nice. Good job ! :-)

John


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RE: CDI gr8flyer55 - 10/28/2012 10:40 PM   
Gompy



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From: Alkmaar, NETHERLANDS
Status: offline 		Slowly we finish the project, the time will be there for a real schematic and PCB.
I can't draw "something" and don't want to read 792 post back to see wat will be changed.

I want to start with the timerboard and "connect" the HV-board to it.
If some one will break the boards, HV and timer serperated, it must be possible.
Also for repair it can be very easy to break the boards a part.
Or make a sandwitch PCB to safe space into your box.

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RE: CDI gr8flyer55 - 10/29/2012 11:44 PM   
Nav-Aids



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From: Winnipeg, MB, CANADA
Status: offline 		I know it's kind of late in the work but, has anyone looked at this web site? transmic.net/en/home.htm.
Gompy might be interested in this site because it is mostly about bike CDI's.
It does have a lot of ideas with PIC's and Atmel MCU's.

Ray

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RE: CDI gr8flyer55 - 10/30/2012 12:21 AM  1 votes
Gompy



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From: Alkmaar, NETHERLANDS
Status: offline 		I can given you 50 more sites of CDI after 40 years work on it
Most CDI's on internet don't work, you need a couple of good people like we have now to make a good CDI.
PIC / AVR software is old or is not opensource, even so the hardware......all secret in epoxy boxes.
We want to make a CDI / TCI you can use with any engine, only changing the software / hardware.
The biggest problem is a reable HV-board with enough power and more professional.
It have to use less power, switch off when spark and switch off if ignitioncapacitor is full loaded.
If you put a candle under pressure the spark will be smaller if the pressure will be higher.
Our engines are low pressure, only race engine (they have allready a CDI) are high pressure.
We want also something more witch cheap factory ignitions don't have, like realtime monitoring.
We can all buy a cheap, 25 US$, CDI and our engines run better.
But I think when we can do more with the CDI and program, we can let the engine run like a rabbit [>:]
If we can make the CDI small, we can also make it bigger.......and can use them for real (mini) bikes / carts / aso.

BTW 1, my father was offroadracer, I grow up with a world champion (Hans Spaan) and my fist project I send to a electronicmagazine was in 1972, a transistor ignition and win a multimeter with the designe
There was good thinking about the prices......now one of the winners have thoose equipment, we al build with a wet finger

BTW 2, there is only one problem.....I stock in 2stroke, thats wat I like !

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RE: CDI gr8flyer55 - 10/30/2012 7:59 PM   
nyemi


 

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From: szarvas, HUNGARY
Status: offline 		Hi John
Thank you for your response.
To you ignition curve idea.
I create for you.

Sure.
Everyone who wants to custom curve.


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RE: CDI gr8flyer55 - 10/31/2012 12:02 AM   
gr8flyer55


 

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From: Hamburg, PA, USA
Status: offline 		Thanks Nyemi. I'll need one good curve for 4 stroke engines. I'll try whatever you make.

John


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RE: CDI gr8flyer55 - 10/31/2012 12:16 AM  1 votes
Gompy



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From: Alkmaar, NETHERLANDS
Status: offline 		Wat about a Exelsheet realtime online ?

BTW John, this was the picture I try to sent to you.

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Click to see fullsize image.
Click for fullsize


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RE: CDI gr8flyer55 - 10/31/2012 6:59 PM  1 votes
Gompy



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RE: CDI gr8flyer55 - 10/31/2012 7:14 PM   
gr8flyer55


 

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Status: offline 		I see you got the hv supply working Rob. Nice work!
Looked at the schematic, should be fine for ignition board too. Plenty of voltage on the charge capacitor, I saw 403 volts. Looks good.

John


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RE: CDI gr8flyer55 - 10/31/2012 8:11 PM  1 votes
Gompy



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From: Alkmaar, NETHERLANDS
Status: offline 		On the new to make PCB I've only to add a diode to stop the HV-oscilator when spark.
The HV-boad will also stop when the ignitioncapacitor is loaded to max Voltage.
If the engine is not running, the current will be 0.01 Ampere.
Maybe we need a littlebit more power, the coil I use now is very small.
Oscilator run now at 50 usec, I hope it's enough time to load the capacitor full.
Now I gone test the schematic to see if everything works like we wish.

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RE: CDI gr8flyer55 - 11/1/2012 12:16 AM   
Gompy



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Status: offline 		John, both your email address are out of order.

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RE: CDI gr8flyer55 - 11/1/2012 1:40 AM   
captinjohn


 

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quote:

ORIGINAL: Gompy

John, both your email address are out of order.


In that case....he cannot get email also !

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RE: CDI gr8flyer55 - 11/1/2012 2:44 AM   
gr8flyer55


 

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Status: offline 		I tried fixing it but it seems beyond what I can do. I'll try another email account.

John


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