It executed it's first program. Had a wiring error but it can be fixed
with
jumpers.
The silver lever is a Aries zero insertion force socket for getting the
chip
in and
out quickly for programming purposes. There is no on board in circuit
programming
for this version. You must have a stand alone programmer.
It is not fully populated yet but all the other circuits have been tested
on
the bench.
Paul Lamar
NICE !
Barron
I am thinking of going one step up on processors to the 80C51.
It is at least four times faster than the 8051. It has built in USB and
PWM mode for the timers.
BTW I am up in Monterey for the rotary races. Mazda owns the race track.
We flew in to San Francisco which was a big mistake, You have to take a
train to get a rental car. The people up here are logic and reason
challenged. They could have built a big parking garage for the rental cars
cheaper than the train. Total travel time was six hours. I could have
driven it in 4 and the cost would be much much cheaper if you need to pay
for airline tickets even with gas at $4 in CA. We don't as Robin is a
retired UAL A&P. The Comfort Inn has lousy Internet service. I am at
Denny's.
My dad had a bad experience flying standby- he flew from Charlotte to
Chicago and was trying to get back. Took 2 days for him to get a seat.
Seems like Chicago might be a tad busy.
I have my board up and running too. I set it up with staged injectors and
manual leaning, all of which seem to be working correctly. I read MAP, temp
and RPM. I used a second board as a signal generator, and it worked well up
to 6000 rpm where the generated pulse width was short enough that it was
having trouble reaching the threshold voltage to fire the coils. I think
that I may have to use a second chip like the 555 as a trigger for the coil
to make sure it works at high rpm. At low rpm the CAS will trigger the
board, but didn't reliably fire the coils. It did fine at high speed.
It will be a bit before I can test it on the engine, I still have to fab
intake, install the radiators, etc. I did finally finish the left wing
except for installing the tip! Progress, little by little.
I will keep testing the code and the board and see how it holds up.
Paul, how many kb is your code file? Mine came in just under 10k total
uploaded to the board including the libraries for the digital temp chip.
The executed code is around 5k, the temp sensor I used has a built in ADC,
so it outputs the temp digitally.
Kevin Alderman
Kevin, What AT chip number are you using? ZBASIC uses the AT1280 and the
AT1281.
A lot of the problems with the timers are the same. Are you using software
PWM?
I am moving much faster with ZBASIC than MikroBASIC and the 80x51xx.
Mainly because the help is in my time zone and not half way around the
world :)
Paul Lamar
My board has the Atmega 2560 chip.
http://arduino.cc/en/Main/ArduinoBoardADK. Says that at 5.5 volts, it will
execute 16 million instructions per second, 1 MIPS per Mhz, and it runs at
16Mhz.
The preliminary run showed it worked as planned. The only issue I had at
all was the signal generator board. I tried to simulate the input from the
CAS at 8000 RPM. I used the analog output of the Arduino Uno as the signal,
but the analog output is in the form of a PWM. When I "fired" the signal
generator at 9 usecs or less, the resulting voltage from the uno wasn't
sufficient to fire the coil. I tried it through a transistor that would
trigger at .7 volts, and it worked but had a delay that might make it
problematic at high RPMs. Need more testing. I have a high speed lathe that
I can stick the CAS in and turn it at 4000 RPM, and as we know the CAS
turns at half engine speed. Should simulate 8000 rpm effectively. I have
been working on my wings, avionics, etc. and trying to program an
electronic health database engine along with about a dozen other projects,
so I haven't gotten back to it- yet.
I programmed the Mega to read temp, MAP and RPM (which doesn't calculate
right at the moment) and come up with a pulse width. This is modified by
the analog input of a POT, with 3 volts being 1.00 and adjusting up or down
from there. I have my injectors staged with primary and secondary depending
on the pulse width. The ADC PWM uses 255 as max, so when injector 1 gets a
PWM over 255, injector 2 gets the remainder. That would be 100 percent duty
cycle, so I might reduce that to 200. I'll see how it goes.
Kevin Alderman
What is that injector width in ms? I think you will have interrupt conflicts at 7000
RPM using the built in software PWM. As I understand it the PWM soft ware disables
all other interrupts while it generates pulse widths. Same for RPM if you are using a
timer. I did those two functions in hardware to avoid the interrupt conflict problem.
You may not notice it if you trigger the 2nd gen ignition directly from the 2nd gen
CAS. You will need an amp for that. A CD4050 or CD4049 CMOS chip will do a wonderful
job if you use 3 or more gates wired in parallel.
BTW it won't work with coil on plug for those using the LS1 or RX8 coils so don't
even think about it :) Kevin is using the 2nd gen coils which in essence are the same
old coils from 50 years ago but have an igniter.
The 1260 chip is basically the same as the 1281 (128K flash 64 pin) ZBASIC uses but
the 1260 has more flash memory. 256K flash instead. I think you mentioned you are
only using 10K. Both run at 16 MHZ. I have the ZBASIC 1280 100 pin with 125K flash
board but the I/O is a bit overkill. I scaled back to the ZBASIC 1281 board 64 pin. A
bit cheaper at $80 rather than $100. Not including the EFI specific hard ware.
Paul Lamar
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