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[Group Buy-19][O] TMS0803/5 Emulating Calculator With Bubble Display

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GB Payment information is here.

 

tms08035-emulating-calculator-build.jpg

 

Hello All,

This is a feeler for a group buy on @@simpleavr's TMS0803/5 Emulating Calculator. Looking at the parts list below, the calculator comes out to be under ~$20. Would you guys be interested in it? It will come as a kit and you will have to build it. There does not seem to be any SMD parts, so this is perfect for the uninitiated. Place your name in the format below if you are interested.

bluehash---------------1---------US

The parts:

1 MSP430G2452, from your Launchpad G2 (the "other" chip in the package)

2 bubble led, from sparkfun ($2.95 ea)

20 tactile buttons, 6 x 3 x 4.3mm, from DX ($4.76/100)

1 spdt dip size switch, from DX ($7.37/100)

1 CR2032 cell holder, from DX ($3.14/20)

1 miniature red led thru-hole, forgot where I got it (see picture)

1 47k pull-up resistor

 

 

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bluehash---------------1---------US
cubeberg---------------2---------US
GeekDoc----------------2---------US

This is about my speed, and my dad would love something he could use that emulates his old, beloved RPN calculator!

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I'm in. Can never turn down anything with bubble leds.

bluehash---------------1---------US
cubeberg---------------2---------US
GeekDoc----------------2---------US
Greeeg-----------------1---------AUS

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Every single time!! I sent off my Elecrow order for 10 Version 2 boards. And discovered spelling mistakes on the silkscreen. I spell DataMath as DataMatch. Oh well.

 

I should be getting these within 10 days (gauged by my last order). I also ordered a different button cell holder this time. The original one is too thick (9.6mm), This one should look better

 

http://www.ebay.ca/itm/181350806167?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649

 

The new PCB will accommodate this and we should have a thinner profile.

 

I check against the PCB traces and they look OK to me, but if you are not in a rush and want to use the new layout, you can wait until I assemble one and validate everything.

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Every single time!! I sent off my Elecrow order for 10 Version 2 boards. And discovered spelling mistakes on the silkscreen. I spell DataMath as DataMatch. Oh well.

 

I should be getting these within 10 days (gauged by my last order). I also ordered a different button cell holder this time. The original one is too thick (9.6mm), This one should look better

 

http://www.ebay.ca/itm/181350806167?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649

 

The new PCB will accommodate this and we should have a thinner profile.

 

I check against the PCB traces and they look OK to me, but if you are not in a rush and want to use the new layout, you can wait until I assemble one and validate everything.

Cool. We'll wait for you to validate then. Thanks!

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Would this be of interest?

 

I have a bag of them (80, all pictured). In various stages of pin bending(i don't think any are broken though).

I didn't really have any plan for them, totally forgot I had them for a while there.

 

I'm open to donating them for this group buy. At least part of them(I don't think there's a need for 80, heh). The catch is that they're 3 digits, this board calls for 4 digit displays.

post-324-0-26930100-1403229826_thumb.jpg

post-324-0-12607900-1403229848_thumb.jpg

post-324-0-63185300-1403230775_thumb.jpg

post-324-0-85899000-1403233348_thumb.jpg

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@@amstan

 

Wow, these looks absolutely more "bubbly" than the sparkfun's. As in bubble led calculator projects, The more bubbly the more awesome.

 

Why don't you show up earlier, Mr. amtan.  :smile:

 

I had the code done more than 6 months ago and were trying out different displays that I can get hold of.

 

Your's is larger and w/ them it will match the original calculators better as we can use 3 of them to make 9 digits.

 

OTHO the sparkfun ones being smaller (4 digits in the same package as your 3 digits), w/ 8 digits + a lone led looks more compact and will fit within credit card size.

 

In real operation though, the 1st digit is mostly used to sometimes show large (or fractional) negative values. For the TMS2500, it will also show over-flow conditions, I think w/ a "C".

 

More likely turn out to be like this failed design on the left (because the 9 digit modules are faulty)

 

post-23-0-77722200-1403264225_thumb.jpg

 

I like them both.

 

As I post I am still waiting for the V2 design (2 x 4 digits sparkfun). So I plan to finish a few of those w/ that parts I had ordered.

 

Then I would really like to do another pcb design w/ your modules and to see how it comes out.

 

May I suggest a trade between a V2 design built + tested and "some" of your 3 digit bubbles? This can happen in 2-3 weeks time in a Timmys as we are only an hour apart.

 

 

 

 

 

 

 

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@@amstan

Is there a source you brought these from. If we use your digits, it would be good to know if there is a reliable source for it... or we could do a limited edition calculator. Yes, if we use your bubble leds, I'll buy them from you.

 

It is upto @@simpleavr now. If you decide to use amstam's leds, first batch PCBs and parts are on me.

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