Additional I/O cards

Ideas for new hardware, questions about existing cards

Additional I/O cards

Postby rhys » Sat Mar 10, 2012 5:11 am

I'm working on a dual K-type TC input card using two Max31855's. Also working on a dual SSR/dual fan speed control output card. And also working on an I2C bus secondary display.

Ultimate goal is a dual zone BGA rework station controller based on the osPID.

I'll post the designs as soon as I get them done :)
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Re: Additional I/O cards

Postby Brett » Sat Mar 10, 2012 12:21 pm

We've also got something like this up in the pipeline. it'll be interesting to see how the designs differ, who finishes first ;)
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Re: Additional I/O cards

Postby rhys » Sat Mar 10, 2012 10:01 pm

Here's the schematic and board layout for a dual TC board using Omega K-type TC connectors. Uses the MAX6675 chip, didn't feel like throwing in a level shifter to make the 3.3V MAX31855 work correctly....
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TEMPERATURE-DUALTC-1R10.zip
Dual TC board
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Re: Additional I/O cards

Postby rocketscream » Sun Mar 11, 2012 10:33 am

That's fast! It'll be nice to see the outcome. :)
But, that will be a very expensive solution, at least from our point of view.
Nevertheless, it will be the simplest solution for your BGA reflow oven I guess.
MAX31855 supply is not here yet. Our order still pending until today.
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Re: Additional I/O cards

Postby rhys » Sun Mar 11, 2012 10:13 pm

I about have the dual SSR and fan speed controller output card done also. I'll post that one later this evening.

The more I dig into this idea, the more i'm thinking I may need to do a complete custom unit to suit my needs. For what I'm wanting to build, having two displays remote to the control board over I2C will reduce the code overhead (only one display library) and make for better mounting. Plus I want to put the USB interface and TC jacks on seperate boards to mount elsewhere, and use surface mount buttons. Your firmware should make for a very good starting point on the software end though. And I'm happy to contribute the I/O card designs I've done so far to the cause. Feel free to use them however your want.
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Re: Additional I/O cards

Postby rhys » Sun Mar 11, 2012 10:56 pm

And as promised, here's the dual SSR w/ fan speed controller. The fan speed controller should work as long as your using a decent 12V power supply to supply the unit, as I pulled the fan power from VIN.
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OUTPUT-SSR&Fan-1R20.zip
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Re: Additional I/O cards

Postby AustralianRobotics » Tue Mar 27, 2012 3:58 am

The fan controller output sounds really useful, I would like to make a PID controller smoker oven. Fan control would be great to regulate the airflow to the firebox...

When can we buy one ? ;)
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Re: Additional I/O cards

Postby rocketscream » Wed Mar 28, 2012 4:11 am

AustralianRobotics wrote:When can we buy one ? ;)


We haven't thought of carrying these and selling them in loose quantities. But, other accessories like the sensors are coming.
But, if you need one: http://au.element14.com/omron-electronic-components/g5le-1a-dc5/power-relay-spst-no-5vdc-10a-pc/dp/5397686?Ntt=5397686
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Re: Additional I/O cards

Postby rhys » Sat Mar 31, 2012 2:01 pm

I am currently in the process of building a small CNC mill for milling PCB's. Once it's finished, if anyone is interested in either of the I/O cards I've designed, or any other custom I/O cards, I would be willing to provide bare PCB's to those interested at a reasonable cost. I'm working on redoing the board designs to minimize through hole count as I do not have the ability to plate the through holes. It only takes me an hour or so to hammer out a custom PCB design, and the CNC mill i'm building should be able to do one-offs fairly rapidly. I'll let everyone know when the mill is complete and tested, hopefully in the next week or two, and you can contact me by PM if you want a custom I/O card.

You're on your own as far as any necessary firmware modifications to support the custom I/O cards though. I'm a hardware guy, I'm not particularly accomplished with software design....
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