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Re: Spudmn's Puma board build
Posted: Tue Mar 27, 2012 10:16 pm
by Fred
Bugger indeed! After careful consideration I've now deemed this project DIY HW as you fucking well have had to! So I'm moving it to a top level forum section for you. Puma may be unloved, but you're not! <3
Re: Spudmn's Puma board build
Posted: Wed Mar 28, 2012 12:39 am
by Fred
Which Puma board was it, the one you purchased with BurgerFuel or the one Jared sent to you? Just wondering where the flux came from, that's all.
Re: Spudmn's Puma board build
Posted: Wed Mar 28, 2012 5:42 am
by Spudmn
The Jared One.
It was my fault. I soldered the XOR on using (what turned out to be) shit solder. Looked OK when i did it but over time the joint started to look bad.
Re: Spudmn's Puma board build
Posted: Wed Mar 28, 2012 8:45 am
by Fred
Gutted! :-(
Re: Spudmn's Puma board build
Posted: Thu Mar 29, 2012 9:35 am
by Spudmn
I have been trying to add the USB PNP hack. Things don't seem right. I am going to check every thing again tomorrow but I just wanted to check that what I am seeing is not normal.
If I only have the USB plugged in (no 12V), the power LED comes on with about half brightness. I think the voltage is back feeding some were.
Re: Spudmn's Puma board build
Posted: Thu Mar 29, 2012 10:29 am
by Fred
viewtopic.php?p=24369#p24369
Did you make both cuts and add both jumpers? The cut "under" the ftdi can be done hard against the end of it if it's already installed. I put a black stripe there.
Did you pick up the correct points with correct leads of the transistor? I'd have to check, but I don't think my power LED comes on with just USB.
At the end of the day, there should be just three connections between USB and Puma: Ground, TX, RX. The transistor should force the CPU RX lead high using CPU power if USB voltage is low. So unless you're hooking the transistor up wrong and it's bridging the two supplies or you've not cut/joined correctly, this shouldn't happen. Will check mine soon and post again.
Fred.
Re: Spudmn's Puma board build
Posted: Fri Mar 30, 2012 1:42 am
by Spudmn
D'oh!
Yep, I had the transistor ass about face.
It is working correctly now.
Re: Spudmn's Puma board build
Posted: Fri Mar 30, 2012 9:58 am
by Fred
Yay! :-) It's very easy to do that with those to92 packages while staring at a datasheet and trying to orient them in your hands, no problem! :-)
Re: Spudmn's Puma board build
Posted: Sat Mar 31, 2012 9:27 am
by Spudmn
I was lucky to find another J722T Ignition module at Pick-a-Part today. It was the only one in the yard.
I did a quick test and it checked out OK.
I hope to try it out on the car tomorrow.
Re: Spudmn's Puma board build
Posted: Sun Apr 08, 2012 6:43 am
by Spudmn
I now know why the J722TÂ blew up. I found that one of the 5V regs had a broken leg. Some times it made contract and sometimes it didn't. When it was open circuit it caused the output to the J722 T to be turned on all the time. This caused it to get hot and burn out.
Anyway I got it all hooked up again took the car for another quick run. This time I did some data logging. I didn't go full throttle, just a nice run up the road.