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Old 01-12-2018, 04:26 PM   #85
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1971 31' Sovereign
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1983 31' Airstream310
Soddy Daisy , Tennessee
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If you have any extras I would love to get a module from you for my 83 310 and get my dash back to normal. Glad their is someone that can design things like this for people like me. How hard is it to change bulbs to LED on the dash so I can see at night while it is apart. Thanks again Jim
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Old 01-14-2018, 08:16 AM   #86
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1984 27' Airstream 270
Scotia , New York
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I will start a list of who wants a module, but first I need to finish up testing and start assembling more boards.

I need to make a tank to simulate the washer fluid and coolant tanks to see how the circuit responds.
I am not sure how to test the water in fuel circuit. That is a diesel engine sensor that I dont have, and have no clue how to setup a test for it?

I just finished the first board and it needs some tweaking. I made 8 circuit boards but only 3 of them are usable due to the photo mask was not dark enough and too much copper was etched off. I think I have the process ready for a new batch, but I will wait until testing is done in case I need to change the design.

For making the circuit boards, I found out, after the fact, that there is a fairly cheap service that will make the boards for you at about $5 a square inch for 3 boards, that would be about $25 a bare board with holes drilled!
The hitch is that you need the drawings is a special format and the learning curve and re-plotting of this design is not worth the effort. Besides I bought the chemicals and boards already and I dont want to make the final cost be any more than necessary.

Here are some photos showing the old board vs the new. The new one is larger, but that was the best I could do for the circuit with a edge connector and room for trimmer resistors to adjust the circuit sensitivity.


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Old 01-14-2018, 09:24 AM   #87
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Wow, lot of expertise involved there!

Hopefully I'm in for two

Brad
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Old 01-14-2018, 09:48 AM   #88
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2007 30' Classic S/O
Somewhere , South Carolina
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WayneG,

Don't own one, but scanned and reviewed the project as a general interest time killer at an airport.

That's a serious piece of reverse engineering and get er done all in one.

Kudos and good luck on the successful outcome.

Reminds me a bit of when I converted a 1985 Caravan 2.2L from carb to fuel inj and had to marry two different engine wiring harnesses a 40 cable replaced by a 60 IIRC. Lots of fun

Gary
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Old 01-15-2018, 08:02 AM   #89
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Wayne, I assume you're talking about OSHpark, I've used them dozens of times, they're perfect production quality boards. Outputting gerbers is pretty easy from any schematic/pwb cad program, and I think there are a couple pdf-gerber converters floating around, feel free to shoot me a PM if you want to email
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Old 01-15-2018, 08:42 AM   #90
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1984 27' Airstream 270
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I am playing with KiCad now to see how hard it is to make something with it. Hard part is non standard parts require playing with the libraries tor proper board layouts
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Old 01-16-2018, 04:34 PM   #91
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Quote:
Originally Posted by bkahler View Post
Wow, lot of expertise involved there!

Hopefully I'm in for two

Brad
Yes, I will mark you down for 2 when I go through this thread to make the list.

I am getting a little progress with the new circuit board cad program and it has me thinking that I may also do a version II of the module.

If I do it, Version II would include a few more pins to allow the step down light to also indicate that the door is ajar and maybe sound a alarm beeper?

On one journey I had my door not fully closed and it swung open when I went around a curve.
The only problem with this mod is that it will require some extra wiring for some users.
For mine it is easy, I am installing a magnetic reed switch on the new electric steps and that wire was there from the old vacuum steps going to the steps light on the dash, It will ground when the steps are not up.

For the door ajar signal, I will use the original door switch on the new steps, but it will be rewired to go to ground instead of power when the door is closed. I just need to invert that signal in the version II module.

One other warning my rig is missing is "headlights are left on" when the ignition is off, but that may be to much to add?

This is all on the assumption that I can master the software and folks are interested.
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Old 01-16-2018, 07:33 PM   #92
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1986 34.5' Airstream 345
Wake Forest , North Carolina
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Wayne,
Count me in for two units
I have an 85 and 86 345 so sure could use them
Dick
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Old 01-17-2018, 04:25 AM   #93
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Wayne, I've tried most of the free cad tools, and KiCAD is hands down the best in my opinion. I have a few hundred hours of experience with it, the big thing is follow some tutorials and generate your parts libraries properly so you only have to do it once
If you want to send me your files before you send them out to fab I'd be more than happy to look them over! I've made dozens of pcbs through OSHpark, could help if you happen to have a quirk they can't handle
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Old 01-19-2018, 02:52 PM   #94
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1984 27' Airstream 270
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I am still drillin version one boards and testing the first one with a plastic jug with 2 electric contacts in it.
So far, with used antifreeze in the jug, it trips all 3 sensors. I still need to test it with washer fluid, and if I can figure out how, water in fuel?

Before I send any of these out, I still need to mount the module in my rig for a live test. Not a big task in weather above 45F but we are still below freezing.

While I wait I am trying to figure out the new KiCad cad program.
Another steep leaning curve;
Like going from screw top to corked wine bottles, Try and Try Again, I will figure it out
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