Computer Control of a PWM design. work in progress.

[lefferdink]

. I have diagrams but can't make a pc board.    I have a standard carb system, so I hope you
continue with this type of system. hope to keep on monitoring.

[z.monkey]

Howdy Lefferdink,

Hey, we were all there once.  Get a chunk of protoboard and solder some components to it.  Wire them together, then try it out.  If it doesn't work figure out why and fix it.  Every master was once a noob...  It looks like we'll be starting out with a simple, basic electrolyzer.  I would like to make a full blown engine management system, but it is probably better to start with a simple system first.  I think I am going to try to run my lawn mower on HHO before I convert the Lexus...

OK, Mo Later...

[Lanmasterd]

Hey lefferdink

yeah its deffinatly gonna be a carb system first as i wouldnt risk tampering with my car unless i knew it would work.. and since im adding the system to my 250cc motor cycle it will see improvements from the get go..

hey z monkey
the lawnmower is a good idea but is ur lawnmower 2 or 4 stroke as i can seen a 4 stroke being easyer to mess waith from work with my mini 4 stoke gasiline engines for my model planes.

and i have a hyrdogen cylinder and ive tested the engine running on pure H2 worked a charm if not to good.. but first off were concentration on control and production..

Im sticking with the chip i have picked out the ATMEGA88 pDip 28 it has enough out puts and inputs for monitoring. it also has a lot of features
Two Independent Output Compare Units
Double Buffered Output Compare Registers
Clear Timer on Compare Match (Auto Reload)
Glitch Free, Phase Correct Pulse Width Modulator (PWM)
Variable PWM Period
Frequency Generator
Three Independent Interrupt Sources (TOV0, OCF0A, and OCF0B)

this makes building the pcb design very simple.. and ill hve proper terminal shielded outputs..

more disigns to come ..

Finished the Usb to Uart serial controler last nite .. the controller is usb powered and will act as the interface for the device..
the Uart system is independent from the main board

ill have another Pcb update on my next post

[z.monkey]

Howdy Lanmasterd,
So are you using low voltage and high current on the electrolyzer, or high voltage and low current.  I guess what I am asking is are you using an ignition transformer to driver the electrolyzer?  What about the electrolyzer itself, how is yours constructed?

My digital driver was designed to be used with an electrical converter, but with that project I have moved on to a more specialized design.  I have a couple of these boards hanging around, so I figured I would put them to use.  HHO is an intriguing project so I decided to try that.  So the heart of my board is a Microchip PIC18F4520 running at 20 Mhz.  I have hardware PWM, but I was thinking that I would rather be bit banging a I/O pin to produce the pulses for the electrolyzer, especially if I was going to integrate the ignition coil.  That would require relatively low frequency pulses.  The driver section is a particularly gnarly MOSFET that has a pulsed drain current of 192 amps.  The project that this was originally designed for needed fast, high current pulses.  But that is handy for HHO as well.  I have yet to built the electrolyzer bottle and the bubbler (if needed), but I have some experience with plumbing clean room equipment so that shouldn't be a problem.

So what language are you using with your Atmel processor?  I have a BASIC compiler I like to use with my PICs, although I do program in assembly language when the BASIC compiler can't do what I want it to do.  I'm using ICSP to program the parts on the board on the fly.

Also you seem to be a printed circuit board designer also.  I'm a CID+.  Are you a member of IPC?

Oh yeah, the lawnmower is a 4 cycle Briggs and Straton 4.5 horsepower.  I have a 2 cycle string trimmer, but the problem with 2 cycle is the lubrication goes in with the fuel mixture, that is going to be a problem with HHO.  I know with 2 cycle engines the fuel mixture flows through the crankcase to lubricate the engine before flowing into the combustion chamber.  If we could seal the crankcase and use regular oil in there, and then port the HHO directly into the combustion chamber then the 2 cycle HHO could work.  But that is a major redesign.  Oh well, maybe someday...

OK, Mo Later...

[lefferdink]

Hi Guys:  Am taking your advice, but...I have the diagram, solder,  digital soldering gun, a board, but not enough parts.  This one horse town that I live in has one run-down Radio Shak.  Where else can I get a mosfets, LM741's, CD4069's? I wonder if Newark Electronics is still around?