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Steve Freedenburg
Works at Ultra Group Inc.
Attended George P. Butler High School
Lives in McDonough, GA 30253
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Steve Freedenburg

commented on a video on YouTube.
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Russians do crazy stuff that's sometimes stupid and all the time dangerous (read fun to watch).  Americans just do stuff that destroy their testicles (read NOT fun to watch).
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Imbibing alcohol = stupid 
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Steve Freedenburg

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Rule #1 don't build something you can't take apart...

The agonizing part of a build is plowing through the parts that aren't fun but ARE smart.

Properly terminating cables and avoiding the ease of directly soldering wires to a PCB when a connector/jack is the better way to go is tough. I just wanna build!!!!
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Paying the extra money for the right crimp tool makes a huge difference, also putting shacker washers under your machine screws stops the screw backing off if you have a concern that might happen.
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Steve Freedenburg

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Full step sequence complete. Storing the index in a static int variable. Repeatedly calling step function and passing the index and returning the index and driving the stepper in a switch case decision element.

I may build in direction next.

Kitten included as a bonus.
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I never much cared for full step sequencing myself. I never use it personally. I have in the past, but I thought it sucked mightily then. Making your own constant current circuit might prove somewhat challenging too. You're probably better off just using a motor driver IC package. They have sequencers, and current limiting built in.
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Steve Freedenburg

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Terminating the baby steppers
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Steve Freedenburg

➥ What do you make? ►  - 
 
Eagle CAD and Eagle3D helped me blow a puff of life into my design so I can see what the finished PCB will look like before production.  This has been my biggest professional challenge to date and aside from a silk screen layer and any wrangling I have to do with the board house's specs.  It's done.

I'd like to thank Netflix, the folks at +Adafruit Industries and +Benjamin Heckendorn  for giving me so much to watch on YouTube while my brain turned to mush routing traces and obsessing over every trace angle, parts placement and other details that likely didn't matter in the end.
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Living the dream Steve. Kudos
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Steve Freedenburg

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Disregard the fact that I took a picture instead of a screen shot...

I've been working on this board for weeks. I've been getting gnarly headaches too...

I now know why. The massive number of permutations regarding layout options is maddening and clearly causing me to stress (it's a project for work with deadlines).

If I route this here, change the layer there, move this down 0.001 inches then I can move this group of things over here and then shrink the board another 0.1 inches and maybe remove an entire signal layer thus reducing the cost of the board by $0.25... rinse and repeat...

I LOVE building things but there comes a point where it's detrimental to your health and while this whole project is I'm my "pay grade" of ability I think if I don't finish it soon I'll likely have a stroke (not quite joking either.)
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+Jay Doscher well, that's partly what this board is. A mega2560- Ethernet shield, SD card reader, RTC, I2C EEPROM array, and a bunch of TTL, RS-232 and USB to TTL serial ports. Some A to D stuff too.

Arduino releases all their schematics and eagle files on their web site so you could start there and mimic sine of what they've done.

But their libraries are a pain and to involved to explain here how to extract the parts from their files. But the libraries are readily available all over the web. Adafruit and Sparkfun have great libraries and Element14 is pretty comprehensive too
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Steve Freedenburg

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I'm slowly grinding away on my stepper motor driver PCBs. I'm going for two boards for the X axis and those are finished.

Working on the Y snd Z now.

My plan is to have this "prototype" expanded and very accessible and all the connectors and LED indicators exposed on the top of the case.

Maybe a future revision ( if this goes well ) I'll do something where everything is consolidated.

I'm a bit concerned with the power hog steppers. I may need to up the LM317s to something beefier. They got hot and hot fast! I'm likely pushing them to the 1.5A by half stepping.
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+Paul Tan
I forget where I bought all of my ICs now, but I think I got them from a supplier like Digikey, or Mouser. I would have remembered if I used a seller from China, or someplace like that. I just did a little looking on the net and this fellow is selling SLA7062M ICs in single unit quantities for $10 a piece, which is a bit steep, but they are nice parts.

http://www.techkits.com/kits/index.htm#ustep

His driver is pretty expensive too, but has some nice features.

I'm not very keen on the Allegro A series motor drives. They're all junk just suitable for 3D printer projects, and the like.
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Steve Freedenburg

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A "story" of a DIY PCB fabrication process through pictures. Drilling the holes and soldering tonight!

The PCBs are stepper motor drivers.
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good stuff !
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Steve Freedenburg

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I'm finally starting the XY table for my CNC mill.

This has been a "one day I'll start this project" type of project.

Well, I got lucky and picked up 4 $60 unipolar steppers for $10 each.

Just hit up Radio Shack for some Molex connectors and we'll bust rump on designing my stepper driver PCB.

Woohoo!
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Steve Freedenburg

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No, it's nothing special. But tonight's project was organizing.

If you're like me you have dev kits, Arduinos, various shields, breakout boards etc... sine just come in ESD bags, others in various sized boxes. I could never store them effectively.

Tada!!! Neat and orderly!
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+jon sanford is right. I've undergone revision after revision. The picture I posted I'd just another revision. 
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Steve Freedenburg

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This was a Rube Goldberg machine my son and I made for a class project several years ago to teach him about simple machines (levers, pulleys etc)

The premise of a Rube Goldberg machine is to take a "simple task" and make it complicated.

The auger portion of the video is a but slow but it did work. One we got it working I threw up the white flag. We turned the garage into a disaster area during the build.


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I think 'final product orientation' limits learning.  
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Steve Freedenburg

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Ah ha!! Pay dirt!

An on-site contractor was cleaning up his work space at my request and found this "junk" in a box.

The long and short, it was for old hardware we used to deploy in the field and thus has no value to the company. My supervisor said take it home or toss it if I didn't want it...

Toss it? Heh, not a chance. Welcome home "junkk!!!


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Sam G
 
Sweet grab!
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Have him in circles
81 people
Samantha Scott's profile photo
Heilman Hackatronics (Matt Heilman)'s profile photo
jon sanford's profile photo
Jodream princess's profile photo
Tatan Nadipudin's profile photo
Elijah Lee's profile photo
Enrique Paz's profile photo
Tuponile Dogo Darweshi's profile photo
Scott Carlson's profile photo
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Currently
McDonough, GA 30253
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Work
Employment
  • Ultra Group Inc.
    R&D engineer, 2011 - present
Education
  • George P. Butler High School
    1991 - 1995
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Male