I'm interested in monitoring engine running condition for the purpose of diagnostics and better understanding of what is going on under the hood.
I know I can use multi-meters or borrow oscilloscope, but it would get cumbersome to monitor more than a couple sensors/solenoids. Is there an interface board and software that I can use with a laptop? This way I'd have a nice real-time display with data logging/post processing capabilities, hopefully on the cheap
It looks like by tapping in to ECU wiring I can monitor:
Throttle Angle Sensor
Engine Coolant Temperature Sensor
O2 Sensor and A/F ratio
Intake air temperature sensor
IACV Solenoid engagement
EGR Solenoid engagement
EGR Valve Lift Sensor
Fuel pump engagement
Radiator Fan engagement
A/C Compressor Clutch engagement
EVAP Purge solenoid engagement
Crank position sensor
Alternator Charging Signal
Electric Load Detector
A PIC microcontroller and associated circuitry could handle the vast majority of those signals no problem. It would obviously be a very DIY project of course.
Other than that... some interface with lots of digital (on off) inputs for Vtec, VSS, fuel, etc, and analog inputs for MAP, throttle, etc. I suspect you'll still have to write your own software to make it good for much.
I'd do it, but I currently am seeking employment so I can buy my CRX shell...
That project is focused on just MPG display, but may be there is some more generic laptop-based automotive monitor? I think there are several commercial solutions for OBD-II but I'm yet to see anything for Honda OBD-I. Does it exist?