DIYEFI.org Forum

Hi my name is HOODEY and I got a lot of negative press on their website on my variable sensitivity over rpm knock detection system. https://www.youtube.com/watch?v=3LjvksDmXf8 I am now wrapping up testing for the Nissan 350z. Recently completed some work on a DIY wide band can been seen here https:/...

Its not free. What is really the purpose of the weak pull up? Each of the PORTB pins has a weak internal pull-up. A single control bit can turn on all the pull-ups. This is performed by clearing bit RBPU (INTCON2<7>). The weak pull-up is automatically turned off when the port pin is configured as an...

Resistor worked fine.

All had to do with how I understood the Nissan optical wheel. What I thought is TDC is not.

I am seeing an ignition timing of 65 degrees at idle but I believe it should be
15 degrees.

Anyone care to explain this? I think I have the solution but I am looking for feedback from others.

A resistor in series with the position signal solves the problem. I am seeing an ignition timing of 65 degrees at idle but I believe it should be 15 degrees. I have adjusted the value. Wondering why I getting such a high value.Rpm looks correct. Windowing should be 10btdc to 50atdc.Still need to ver...

Guys I am not controlling the engine. I am simply using the TDC and position information. If i have the TDC and spark pulse information feeding the port as soon as I connect the position information to the timer the engine stumbles. I remove the pic8f452 from the board and I had no problems. This pr...

Hoodey, are you using the 'interrupt on change' port inputs? Yes. And are you having the problem when both the cam and crank signals are connected to the processor on separate input pins? Yes. RCO and RB6 If so, you might have to account for an interrupt occurring while one interrupt is being servic...

movlw b'11111111' ;Set bit 7,6,5, 4 as input movwf TRISB ;For port B interrupts ; Lower bits for reading keypad ; 7 -data Available ; 6 -Spark Pulse ; 5 -G1 Cam pulse/Nissan reference PULSE movlw b'10010001' ; RC0 input to timer 1..External clock movwf TRISC Pins are set to input.Will try the resis...

The nissan outputs are 5 volt outputs and I am connecting directly to the
PIC. I would have thought PORTs configured as inputs would not load the source.

Assistnace need

When I use on of the signals from the distributor i.e cam or crank
I have no issues. However when I try to connect both to
the interrupt ports the engine seems to want to die. Any idea on how to read the signal without affecting the engine?