Shift Light Issues

[slewinson]

If you are sourcing a 12v signal from the tacho drive into the cluster then I would look to change the resistor values. They look like 1W and the values look about right for a normal Kettering ignition setup.

Try an 8.2K resistor in place of the 820 ohm as this should give reasonable signal levels. You could also try using a variable resistor to tune this value. Response time can be tuned a bit by reducing the capacitor value but this might make the circuit less stable near the tepransition and give some flicker or false triggering. YMMV


Simon

[Vpgts076]

Finally, speed of response will be a function of the PIC firmware.

Joe.

Attached is the read off the PIC 12F675 and it appears to be blank.

Can anybody confirm this?

If so how do I upload as site doesn't allow for hex files.

Thanks
Daniel

[Dylan]

Try zipping it and uploading the zipped file?

[Vpgts076]

RAR Worked...

Please see attached....

[j_ds_au]

If you are sourcing a 12v signal from the tacho drive into the cluster then I would look to change the resistor values. They look like 1W and the values look about right for a normal Kettering ignition setup.

Try an 8.2K resistor in place of the 820 ohm as this should give reasonable signal levels. You could also try using a variable resistor to tune this value. Response time can be tuned a bit by reducing the capacitor value but this might make the circuit less stable near the tepransition and give some flicker or false triggering. YMMV


Simon

I didn't say it's a 12V signal (I have no idea), just that the resistor values suit 12V or higher. If it's actually 12V signals, there's no need to change any resistor values, it will stop working at around 9V.

Also, the capacitor is for noise filtering, it won't affect response time, that's firmware.

Joe.

[j_ds_au]

Finally, speed of response will be a function of the PIC firmware.

Joe.

Attached is the read off the PIC 12F675 and it appears to be blank.

Thanks
Daniel

You're funny.

It appears blank because it's been protected.

Joe.

[Vpgts076]

Thanks for your help guys.

Hi Joe,

Does this mean there is NO WAY to speed it up as 1.5K out is unusable.

thanks
Daniel

[Dylan]

Does the LS1 ECU give an output? Think the VT GTS had one. I remember a mates VZ LS2 having one I think.
A light on the dash come on below the cluster from memory.

[VL400]

If you are sourcing a 12v signal from the tacho drive into the cluster then I would look to change the resistor values. They look like 1W and the values look about right for a normal Kettering ignition setup.

Try an 8.2K resistor in place of the 820 ohm as this should give reasonable signal levels. You could also try using a variable resistor to tune this value. Response time can be tuned a bit by reducing the capacitor value but this might make the circuit less stable near the tepransition and give some flicker or false triggering. YMMV


Simon

This is the problem. Can prove it with this .. http://pcmhacking.net/forums/viewtopic. ... lay#p21551

Or just play with the values as suggested.

[slewinson]

If you are sourcing a 12v signal from the tacho drive into the cluster then I would look to change the resistor values. They look like 1W and the values look about right for a normal Kettering ignition setup.

Try an 8.2K resistor in place of the 820 ohm as this should give reasonable signal levels. You could also try using a variable resistor to tune this value. Response time can be tuned a bit by reducing the capacitor value but this might make the circuit less stable near the tepransition and give some flicker or false triggering. YMMV


Simon

This is the problem. Can prove it with this .. http://pcmhacking.net/forums/viewtopic. ... lay#p21551

Or just play with the values as suggested.

Hey VL400, your way may be better as the pulse width is much shorter and the RC filter on the PIC input may not "saturate" or whatever the correct term is. Other way would be to use a 55 as a narrow pulse one-shot to condition the signal.

12V was an assumption based on the standard tacho drive in most modern cars, and I am 90% sure that the commodore is the same.

Simon