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Old 01-10-2012, 09:26 PM   #23
Noah
Rustle Crow
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Join Date: Apr 2006
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Quote:
Originally Posted by AB-737 View Post
I'm trying to build this and I'm a bit confused... You state to pick up 3 resistors and 2 caps from Rat Shack... yet in your image of your circuit I see 3 caps and 2 resistors...
I'm also building this circuit. As per the timer circuit in the diagram, there are 3 resistors used. 2 build a voltage divider that then feeds pin 7. The other is to attenuate the timer output on pin 3 before it goes to the ECU. What is a bit confusing to me is the rest of USB portion of the circuit. The EHR-5 header and part where the 10uF cap goes is confusing me.

Here is what I've built so far.



Timer circuit is working properly.




What I find particularly confusing is that in the schematic, they use the pinouts for the FTDI chip on the DLP-USB232M board, instead of the pinout for that board.

http://www.ftdichip.com/Support/Docu...FT232BL_BQ.pdf

However, after reading through the documentation from DLP Design, I think I have it working. I will be testing this tomorrow on an 04 STI ECU.
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Last edited by Noah; 01-11-2012 at 12:22 AM.
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