ITPS Timing Problem

**dug1967** · 04-22-2004, 09:34 PM

I will let you know how it goes... I really don't think it will be to difficult.... literally just take the source code, change the desired time delays to the desired values and burn to a new PIC....

But we shall see...

**Ricky327** · 04-22-2004, 09:59 PM

I had a brief look at the code as published in "power.pdf" and all the delays are based on a "200ms delay" routine.

The most you can have is 256 x 0.2 = 51.2 seconds delay...so this need looking into.

Perhaps the easiest and neatest is to make a "minute delay" routine. Just call the routine up to 256 times through a loop giving more then 4 hours of delays.

**Ricky327** · 04-22-2004, 10:02 PM

EDIT : Unless they have a newer version of firmware. I have heard of it but I dont think it has been released in the public.

**Entcee** · 04-23-2004, 12:55 PM

Just an update. After rigorously testing the ITPS, here is what I have come up with this: Thanks to Ricky327 for all your help

**Laidback** · 04-23-2004, 01:20 PM

What are you saying with that red line? That it's on before you turn the ignition on? Is it already at 5v or what?

**Entcee** · 04-23-2004, 01:43 PM

On the pulse line the circuit is grounded. High means grounded, low means not.
Another way to put it (since the pulse acts as the power button on the front of the PC) is that the button is pushed before the ignition comes on, and is released 1 second after the 12v rail turns on.

**Entcee** · 06-07-2004, 06:03 PM

Here is an update:
http://www.mp3car.com/vbulletin/power-supplies/27587-itps-revision.html#post214926

**nadforever** · 10-26-2004, 04:31 PM

i am having almost the same problem but my problem is that it never sends an on signal to my computer , but if i let the itps stay on for alittle while withteh switch wire still getting a 12v signal and then let go of it liek i turn my car of thats when i sends the turn on/off signall to my computer then my comp turns on but of course after liek 45 it woudl lose all power.

**Entcee** · 10-26-2004, 05:30 PM

Originally Posted by nadforever

i am having almost the same problem but my problem is that it never sends an on signal to my computer , but if i let the itps stay on for alittle while withteh switch wire still getting a 12v signal and then let go of it liek i turn my car of thats when i sends the turn on/off signall to my computer then my comp turns on but of course after liek 45 it woudl lose all power.

That is waht I was experiencing too. Newer ITPS should not have this problem since they fixed the code. If it is an older one, you may have ot send the chip to iTuner.com for an update.