In SX Microcontrollers, SX/B Compiler and SX-Key Tool, markistuff wrote:

I tryed uploading a video clip of it running but the forums would let me, so i posted it on youtube.  heres the link.
[color=#000099>[url=http://www.youtube.com/watch?v=n1ILB1D01Pc][/url]

 

 

William Chan - i didnt use any TO-220 package mosfets,  i got them in the 8pin dip style,  only because that was all that was in stock were i got it.

 

John Couture - i used pcb wizard to make the silkscreens or whatever their called for etching.  i looked and thier isnt a way to convert the pcb layout to a circiut design

 

bennettdan - as to the wideband o2 sensor, i could have put one on but i was trying to save some money.  but my brother wants me to build him a device that used the wideband o2 sensor and you put it in the exsause and it shows you on a lcd screen what air/fuel ratio the car is.  he wants to tune the carbs on his cobra.   when i said i have it running, it will idle perfectly, and once i added in the coding to increase the pulswidth when you hit the gas it is very responsive.  but right now for some reason it will not hold a high rpm without backfireing alot.  not to sure whats causing that.  its running the stoikiometric(how ever you spell it) 14.7 to 1, well at least the o2 sensor says it is.  i think that my ignition is way out of wack,  to much advance.  its still running off the old ignition system not my ecu. i figured only work with one part of the system at a time so its easer to get all the bugs out.

 

on the little white breadboard i put some lcds for debugging,  the video is pretty crappy i know but one will turn on when the engine is warm,  then i have two one that turns on when the O2 sensor says its lean, so the computer makes it richer and visvera,  does what its supost to,  jump back and forth between the two really quickly when its running the right mixture.

 

i guess next is figure out if its my ignition or the fuel injection that is causing the backfiring, then from thier i can get the info to make the VE tables.  bennettdan, im not sure if it would be better to have tables made and stored in the eeprom or just let the sx calcuale it out based on some predetermined verables?

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