John, The minute I saw your name as sender the bell rung. Getting a few cobwebs up in my belfry these days I'm afraid. Sound like a thorny project - but I'll bet you are having fun toying with it. Wish there was some way I could help. Unfortunately I'm not much on electronics. Thanks for the heads up. I know everyone is eager about this project. Regards, John R John Rodgers Clayartist and Moldmaker 88'GL VW Bus Driver Chelsea, AL Http://www.moldhaus.com
On 5/7/2010 2:55 PM, John Bange wrote: >> My apologies - but I can never remember who is was/is working on a >> digital replacement for the analog box just forward of the right hand >> tail light. >> >> Anyone know what has become of that project? >> >> >> > That's me! I'm still plugging away at it as time permits. I have a test unit > that can open the idle valve between 0 and 100%, but it doesn't have fine > enough control. Idle jumps erratically from "nearly stalling" to "headed for > red-line". I suspect the pulse width modulator built into the Atmel > controller I'm using just doesn't work at a frequency the solenoid valve > likes. Subsequently, I have to write a PWM routine myself from scratch--- a > task I've been procrastinating on because it doesn't sound fun. The biggest > problem is going to be to figure out what frequency WILL work. Trial and > error is pretty tedious. I've been poking around for an oscilloscope so I > can measure what the stock analog unit operates at, but nothing affordable > has showed up yet. > > Still, my spare idle valve and the controller unit are always sitting front > and center on my desk at home, and I do fiddle with it at least a couple > times a week. > > -- > John Bange > > > |
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