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PhilM

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  1. Like
    PhilM reacted to simpleavr in [Group Buy-19][O] TMS0803/5 Emulating Calculator With Bubble Display   
    Now that we have the blueprint..... I would put one in my inkjet for 3D printing. 
  2. Like
    PhilM got a reaction from dubnet in [Group Buy-19][O] TMS0803/5 Emulating Calculator With Bubble Display   
    Not sure this is the right thread but feel free to move it / suggest a new one :-)

    >>>
     
    Well ... I'm not a huge fan of Doctor Who but my mum (in her 70s) is! I just happened to be walking past her enjoying this episode:   http://www.bbc.co.uk/iplayer/episode/b04mhqf1/doctor-who-series-8-9-flatline   right at the 26 minute mark, and *what* do I see but a Sinclair Scientific repurposed no less to convert 2 dimensional entities into 3 dimensional entities - a device that goes on to save the whole planet ...   http://phils.bitboxes.co.uk/calculators/sinclair/scientific/images/ss_2dis_01.jpg   http://phils.bitboxes.co.uk/calculators/sinclair/scientific/images/ss_2dis_02.jpg   and these images with the re-branded 2Dis (Two Dis) logo conveniently covering the old Sinclair Scientific logo   http://phils.bitboxes.co.uk/calculators/sinclair/scientific/images/ss_2dis_03.jpg   http://phils.bitboxes.co.uk/calculators/sinclair/scientific/images/ss_2dis_04.jpg   ... and in these you can clearly see the distinctive 1.4:2 LED display format    http://phils.bitboxes.co.uk/calculators/sinclair/scientific/images/ss_2dis_05.jpg   http://phils.bitboxes.co.uk/calculators/sinclair/scientific/images/ss_2dis_06.jpg   I can see the headline now ... device with 320 eleven bit words saves Earth   and some people just think it was another calculator   I wonder if their props guy (or gal) was inspired by Ken's blog     Phil M  
    <<<<
     
    Via Ed
     
    The BBC has published some artwork of the device - apparently it is even a working calculator:  http://www.bbc.co.uk/programmes/galleries/p028vm5v   via http://4dc5.com/2014/10/19/doctor-who-hacks-a-calculator/ via https://twitter.com/bbcdoctorwho/statuses/523837142477570049   Cheers Ed  
  3. Like
    PhilM got a reaction from roadrunner84 in [Group Buy-19][O] TMS0803/5 Emulating Calculator With Bubble Display   
    Not sure this is the right thread but feel free to move it / suggest a new one :-)

    >>>
     
    Well ... I'm not a huge fan of Doctor Who but my mum (in her 70s) is! I just happened to be walking past her enjoying this episode:   http://www.bbc.co.uk/iplayer/episode/b04mhqf1/doctor-who-series-8-9-flatline   right at the 26 minute mark, and *what* do I see but a Sinclair Scientific repurposed no less to convert 2 dimensional entities into 3 dimensional entities - a device that goes on to save the whole planet ...   http://phils.bitboxes.co.uk/calculators/sinclair/scientific/images/ss_2dis_01.jpg   http://phils.bitboxes.co.uk/calculators/sinclair/scientific/images/ss_2dis_02.jpg   and these images with the re-branded 2Dis (Two Dis) logo conveniently covering the old Sinclair Scientific logo   http://phils.bitboxes.co.uk/calculators/sinclair/scientific/images/ss_2dis_03.jpg   http://phils.bitboxes.co.uk/calculators/sinclair/scientific/images/ss_2dis_04.jpg   ... and in these you can clearly see the distinctive 1.4:2 LED display format    http://phils.bitboxes.co.uk/calculators/sinclair/scientific/images/ss_2dis_05.jpg   http://phils.bitboxes.co.uk/calculators/sinclair/scientific/images/ss_2dis_06.jpg   I can see the headline now ... device with 320 eleven bit words saves Earth   and some people just think it was another calculator   I wonder if their props guy (or gal) was inspired by Ken's blog     Phil M  
    <<<<
     
    Via Ed
     
    The BBC has published some artwork of the device - apparently it is even a working calculator:  http://www.bbc.co.uk/programmes/galleries/p028vm5v   via http://4dc5.com/2014/10/19/doctor-who-hacks-a-calculator/ via https://twitter.com/bbcdoctorwho/statuses/523837142477570049   Cheers Ed  
  4. Like
    PhilM got a reaction from bluehash in [Group Buy-19][O] TMS0803/5 Emulating Calculator With Bubble Display   
    Just got back from a week away and found that my kits arrived last week
     
    One in kit form to build and one assembled and working

    Thanks guys :-)
     
  5. Like
    PhilM reacted to simpleavr in [Group Buy-19][O] TMS0803/5 Emulating Calculator With Bubble Display   
    @@PhilM
     
    The way I am direct driving the LED is not the "correct" way to drive LEDs and could reduce the lifespan of LEDs. The proper way would be to drive them via transistors and current limiting resistors. Which in this project (or most of my projects) I decided to skip them to keep the component count down and to save PCB space. To me it is more important to get this on a easier to build thru-hole layout.
     
    LEDs can allow excessive current on a very brief period and since we are doing multiplexing already, we are not constantly turning on each individual LED at the same time. I think of it as a PWM (pulse width modulation) way to limit current.
     
    This link had a good discussion on it.
     
    http://tinkerlog.com/2009/04/05/driving-an-led-with-or-without-a-resistor/
     
    It does have its drawbacks, depending on what is displaying, there are voltage drops to the whole circuit. Fortunately this project is all digital and the voltage drop does not affect the functioning.
     
    When we do multiplexing, we turn on the 8 digits one by one. And for each digit's on time, it needs to sink (or source) 8 segments at the same time. Ex. when we display "1", we are driving 2 led segments, and when we display "8" we are driving 7 segments, which has a bigger voltage drop and is less bright.
     
    When I mean of "evening out" is that during multiplexing, we alter the time to keep a particular digit on (or off) based on the number of segments it need to drive. I.e. say when we display "1", the digit stays on for 10us, and for displaying "8", the digit is made to stay on for 25us, etc. This will result in a more consistent brightness regarding of the numbers it is displaying.
     
    I won't worry about damaging the LEDs. Been driving LEDs like that for many years. I've built 6 of these and I use one regularly every day. They are just not bright enough for under-the-sun use as there is no driver.
     
    As for @@amstan LED donation, which I mentioned in an earlier post that I managed to blow one of them, it turned out that (I believe) it was bad before I tried them. I finally got time to check all the 80 LED modules and it turned out most has some problems. There are 23 units that are good, the rest all have either missing digits or segments. And some of them has one or two "weak" segments, etc. I recall buying from ebay that had similar problem. Guess this is what happen when they sat in a bag for 20+ years.
     
    Anyway I am still working w/ blue# on the group built units and hope they will be ready really soon for you.
     
     
     
     
     
     
  6. Like
    PhilM got a reaction from bluehash in [Group Buy-19][O] TMS0803/5 Emulating Calculator With Bubble Display   
    Thanks bluehash

    Payment and PM sent
  7. Like
    PhilM reacted to bluehash in [Group Buy-19][O] TMS0803/5 Emulating Calculator With Bubble Display   
    Yes.. I can do that for you. I'll PM you the address.
  8. Like
    PhilM reacted to bluehash in [Group Buy-19][O] TMS0803/5 Emulating Calculator With Bubble Display   
    Update: Boards shipped from Elecrow yesterday. All parts should be here soon. 1.5 to 2 weeks until delivery to gb participants start.
  9. Like
    PhilM reacted to simpleavr in [Group Buy-19][O] TMS0803/5 Emulating Calculator With Bubble Display   
    I also prefer green for the TMS080x emulation.
     
    The white PCB is actually for another emulator (WIP).
     

  10. Like
    PhilM reacted to bluehash in [Group Buy-19][O] TMS0803/5 Emulating Calculator With Bubble Display   
    All parts ordered and on their way to me.
  11. Like
    PhilM reacted to bluehash in [Group Buy-19][O] TMS0803/5 Emulating Calculator With Bubble Display   
    @@simpleavr I'll have white PCBs made Good call.
     
    @@cubeberg I have one too. I'll use the LP in this case. Since they are not too many. If I make you do it, we'll have to ship the chips around.
     
    Edit: Going with green for this batch.
  12. Like
    PhilM reacted to bluehash in [Group Buy-19][O] TMS0803/5 Emulating Calculator With Bubble Display   
    I might flash all the chips, instead of keeping track., so yes.
     
  13. Like
    PhilM reacted to bluehash in [Group Buy-19][O] TMS0803/5 Emulating Calculator With Bubble Display   
    Thank you all! I'll go ahead and get the parts ordered.
     
    bluehash---------------1---------US[PAID]
    cubeberg---------------2---------US[PAID]
    GeekDoc----------------2---------US[PAID][Thank you!]
    Greeeg-----------------1---------AUS[PAID][Thanks for the donation!]
    Swampdonkeykami--------2---------CA[PAID]
    SergioDeNice-----------1---------FR[PAID]
    2lostkiwis-------------2---------NZ[PAID]
    distefanom-------------1---------ITA[PAID][Thanks for the donation!]
    angelgrig--------------1---------GR[PAID]
    jensma-----------------1---------GER
    clyvb------------------2---------US[PAID][Thank you very much!]
    philm------------------2---------UK[PAID]
  14. Like
    PhilM reacted to bluehash in [Group Buy-19][O] TMS0803/5 Emulating Calculator With Bubble Display   
    @@PhilM Thanks. Make sure to remind me again when I let you guys know that they are ready to ship...just in case.
    If you are a novice solderer, use a socket.. although it is not much different. I can send you a bare Launchpad v1.4 PCB to test solder on.
  15. Like
    PhilM reacted to simpleavr in [Group Buy-19][O] TMS0803/5 Emulating Calculator With Bubble Display   
    @@PhilM
    @@distefanom
    @@bluehash
     
    Thanks for your interest in the calculator.
     
    The group buy was initiated by bluehash. I believe he is procuring all the necessary parts and will turn them into kits, and will have them shipped from US when ready. Let's give him a couple of days to update all on the progress. He's part-time managing this site.
     
    The software and hardware are open sourced for anyone who's interested to build, see the build thread for more detail. If anyone needs the Gerber files for fabrication, I will be happy to provide via PM. The circuit is also simple enough to roll your own.
     
    If there should be complications on bluehash's side in making this happen, I will be glad to take up the task and create a few of this kits. In fact I have 2/3 set of parts sitting here. The cost of shipping from Canada is a bit high though. It costs $9.50 just for the postage for Europe.
  16. Like
    PhilM reacted to simpleavr in [Group Buy-19][O] TMS0803/5 Emulating Calculator With Bubble Display   
    @@PhilM
     
    Hello Phis,
     
    Thanks for great resource. Looks like we are adding a 3rd rom (Sinclair Cambridge) to the build thanks to Ken Sherriff.
     
    I am really surprise to see the actual Sinclair did not compense the brightness of less segmented digits (say '1'). I guess that was the limitation on the H/W. May be the msp430 implementation should be changed to observe that.
     
    I don't have 3D printing resources. The PCB is 50mm x 85mm, i.e. same width, but shorter. I guess one can lengthen the PCB if desired.
     
    I know The Sinclair was offered as a kit, so one can design a new PCB that fits and replaces the old one. May be cheaper to do than creating all the plastic parts.
     
    /EDIT also thanks for your work on the original simulators, Ken Sherriff mentions your contribution on his page.
  17. Like
    PhilM got a reaction from simpleavr in [Group Buy-19][O] TMS0803/5 Emulating Calculator With Bubble Display   
    Just a thought ... I also did the images and manual for the sim
     
    How easy / doable would it be for any of the above who can do 3D modelling and laser / 3D prototyping to match the pcb to a realistic original style case for the Scientific and/or the Enterprise?

    Some old files here:

    http://phils.bitboxes.co.uk/calculators/dev/
     
    I've got lots more files / better for measurement, etc. please message me
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