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Jim Thompson
Works at United Space Alliance
Attended Auburn University
Lives in Pearland, TX
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Jim Thompson

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Just got my first self-designed printed circuit boards in the mail. I went to oshpark.com, because their prices and turnaround time were the best for a low-volume do-it-yourselfer like me. Their boards are gorgeous with a purple solder mask, gold finish over exposed copper, and white silkscreen for lettering and component placement marks.

I did all the design work in EAGLE, including a prototype single-sided board I made myself using the toner-transfer process (necessary, but what a mess!), then the full double-sided board you see here.

Next steps: use the DMM to test trace continuity, test-fit the components, solder everything down, and finally a full-up functional test. This is my first, so wish me luck!
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Jim Thompson

News Articles  - 
 
Just got my first self-designed printed circuit boards in the mail. I went to oshpark.com, because their prices and turnaround time were the best for a low-volume do-it-yourselfer like me. Their boards are gorgeous with a purple solder mask, gold finish over exposed copper, and white silkscreen for lettering and component placement marks.

I did all the design work in EAGLE, including a prototype single-sided board I made myself using the toner-transfer process (necessary, but what a mess!), then the full double-sided board you see here.

Next steps: use the DMM to test trace continuity, test-fit the components, solder everything down, and finally a full-up functional test. This is my first, so wish me luck!
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Len Sherman's profile photoLuis Diaz's profile photoJim Thompson's profile photo
17 comments
 
+Len Sherman In this case the design included a new EAGLE device (as in symbol + package) that I had to create myself. Doing a toner-transfer board helped me to verify the device was correct.
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Jim Thompson

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I can't blame them...
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Jim Thompson

Projects  - 
Great news, Makers! We're excited to announce the immediate availability of the Arduino IDE 1.6.10, AVR core 1.6.12 and SAM core 1.6.9. The most notable feature of this release is the introduction of an up-to-date bundled toolchain for AVR containing the latest goodies from Atmel, ...
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Jim Thompson

News Articles  - 
 
Cool Arduino project of the day.
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José María Martínez García's profile photo
 
Portrait videos sucks!
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Jim Thompson

Discussion  - 
 
Last week I had for you a demo of the retro-tech TIL 311 hex digit LED display; this week it's the HP 5082 7300, a very similar display, but with some important differences.

The most obvious difference is that the HP display has its pins arrayed across the top and bottom of the digit, where the TI display has them on the left and right sides. The HP arrangement makes it easier to breadboard a display with the digits right next to each other, though for any permanent installation you're going to have a custom PC board or sockets, so this probably is not much of a difference in the long run.

Physically, the two display modules are about the same width, but the HP is about 1/8" shorter. However, the emitting areas of each display are about the same size.

In the HP display, the individual LEDs are a bit larger, probably due to the fact that they're square rather than round. This makes the displayed digits seem more "smooth" and less "pixelated". It makes a difference, and I prefer the legibility of the HP displays.

The most significant difference is that the TI display will display hex digits A-F, whereas the HP doesn't; it's decimal digits only. (There's a special version of the HP display, the 7340, that will display hex digits.) If you input 0xA (10 decimal), the HP display does a "lamp test" in which it lights up every LED except the decimal. If you input 0xD (13 decimal), the HP displays a "minus sign" for negative numbers. If you input any other hex digit, the HP goes blank.

In the video, you can see that I've used the same breadboard and Arduino nano, and have simply wired the HP displays (on the right) in parallel with the TI displays (on the left).

I bought 16 of these HP displays. I only wanted eight, but on ebay the smaller lots actually cost more per digit than just biting the bullet and buying a lot of 16. (The total with shipping was $83 - ouch, but I really love these little guys.) The seller actually had an original blister pack, but it was so old that the glue holding the backing paper onto the plastic blisters had come undone, and when I received the package, most of the displays were rattling around loose in the box. No harm done, though, as they all look and work just fine.

I'm hoping that somewhere down the line I can find a batch of the hex-capable version of these displays.

Next week I hope to have for you a demo of the MAN2A, a 5x7 LED grid with individually addressable pixels. (Cool!)

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Nice
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Jim Thompson

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Received some IC sockets in the mail today. Using them to build a semi-permanent display board for my HP 5082-7300 LED displays. Only four wired up today, eventually I'll have this protoboard wired up for 15. (Wanted to wire up 16, but the board's not quite long enough.)

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Jim Thompson

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Friday cool project.
https://github.com/pirxthepilot/monomepi-stepsequencer
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Very nice, the sequencer control looks nice and easy to use, nice work
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Jim Thompson

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Cool Arduino project of the day.
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Really stylish weather forecast.
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Jim Thompson

Projects  - 
 
Received some IC sockets in the mail today. Using them to build a semi-permanent display board for my HP 5082-7300 LED displays. Only four wired up today, eventually I'll have this protoboard wired up for 15. (Wanted to wire up 16, but the board's not quite long enough.)

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Jim Thompson

Shared publicly  - 
 
 
Last week I had for you a demo of the retro-tech TIL 311 hex digit LED display; this week it's the HP 5082 7300, a very similar display, but with some important differences.

The most obvious difference is that the HP display has its pins arrayed across the top and bottom of the digit, where the TI display has them on the left and right sides. The HP arrangement makes it easier to breadboard a display with the digits right next to each other, though for any permanent installation you're going to have a custom PC board or sockets, so this probably is not much of a difference in the long run.

Physically, the two display modules are about the same width, but the HP is about 1/8" shorter. However, the emitting areas of each display are about the same size.

In the HP display, the individual LEDs are a bit larger, probably due to the fact that they're square rather than round. This makes the displayed digits seem more "smooth" and less "pixelated". It makes a difference, and I prefer the legibility of the HP displays.

The most significant difference is that the TI display will display hex digits A-F, whereas the HP doesn't; it's decimal digits only. (There's a special version of the HP display, the 7340, that will display hex digits.) If you input 0xA (10 decimal), the HP display does a "lamp test" in which it lights up every LED except the decimal. If you input 0xD (13 decimal), the HP displays a "minus sign" for negative numbers. If you input any other hex digit, the HP goes blank.

In the video, you can see that I've used the same breadboard and Arduino nano, and have simply wired the HP displays (on the right) in parallel with the TI displays (on the left).

I bought 16 of these HP displays. I only wanted eight, but on ebay the smaller lots actually cost more per digit than just biting the bullet and buying a lot of 16. (The total with shipping was $83 - ouch, but I really love these little guys.) The seller actually had an original blister pack, but it was so old that the glue holding the backing paper onto the plastic blisters had come undone, and when I received the package, most of the displays were rattling around loose in the box. No harm done, though, as they all look and work just fine.

I'm hoping that somewhere down the line I can find a batch of the hex-capable version of these displays.

Next week I hope to have for you a demo of the MAN2A, a 5x7 LED grid with individually addressable pixels. (Cool!)

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Jim Thompson

Discussion  - 
 
Question for the hive mind: any of y'all ever use 123D Circuits? It's an online circuit simulation site from Autodesk, the people who make AutoCAD (formerly it was circuits.io, acquired in 2014 by Autodesk). It has a virtual solderless breadboard, Arduino Uno, Arduino IDE, and what looks to be lots of discrete parts.

Just wondering if it's worth my time to dig deeply into it.
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+Grant Hitchens Sure, I understand the value and risks of that kind of site. I'm just wondering whether this particular one is and good. (In the opinion of those who have spent some time using it.)
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Education
  • Auburn University
  • Virgil I Grissom High School
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Male
Other names
JT
Work
Occupation
Engineer, Software Architect, Code Monkey
Employment
  • United Space Alliance
    Engineer, Software Architect, Code Monkey, present
  • Link Flight Simulation
  • Jackson and Associates
  • Western Geophysical
  • United Space Alliance
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Currently
Pearland, TX
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Huntsville, AL - Murfreesboro, TN - Huntsville, AL - Atlanta, GA - Auburn, AL - Houston, TX
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reviewed 4 months ago
Public - 4 months ago
reviewed 4 months ago
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