monic part 3: towards a handheld
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07-01-2020, 01:54 AM
(This post was last modified: 09-10-2022 09:00 AM by F-73P.)
Post: #1
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monic part 3: towards a handheld
Previous: monic part 2: connecting the keypad
Next: monic part 4: arbitrary-precision rational arithmetic I will now place the display and matrix keypad on veroboard. The calculator can then be connected to a development board (such as the NXP i.MX RT1010 I have been using so far) via terminal blocks on the left of the veroboard. I am also trying to find keycaps for the Omron B3F-1052 pushbuttons; any suggestions? The C language combines all the power of assembly language with all the ease-of-use of assembly language |
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07-01-2020, 10:17 AM
Post: #2
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RE: monic part 3: towards a handheld
Hello!
Very interesting project, looking forward to see more of it. (07-01-2020 01:54 AM)F-73P Wrote: I am also trying to find keycaps for the Omron B3F-1052 pushbuttons; any suggestions? I have used this kind for some tinkering projects in the past (this is an eBay-link, unfortunately I couldn't find them anywhere else - they come from China anyway, no matter who you order them from): https://www.ebay.com/itm/A14-Tactile-Cap...3216076402 You can select a keycap in the colour you like and snap a transparent cover over it. The gap between keycap and cover is large enough for a key label printed on solid/thick paper. These caps should also fit your Omron switches, but better compare the measurements. Regards Max NB: Maybe I missed it in your earlier posts, but what does "monic" stand for? |
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07-23-2020, 04:02 AM
Post: #3
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RE: monic part 3: towards a handheld
(07-01-2020 01:54 AM)F-73P Wrote: I am also trying to find keycaps for the Omron B3F-1052 pushbuttons; any suggestions? We use them in a couple of our products at work. Availability has never been a problem at all. See https://www.mouser.com/Electromechanical...ps&FS=True http://WilsonMinesCo.com (Lots of HP-41 links at the bottom of the links page, at http://wilsonminesco.com/links.html#hp41 ) |
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07-28-2020, 09:21 PM
(This post was last modified: 07-28-2020 09:25 PM by Chr Yoko.)
Post: #4
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RE: monic part 3: towards a handheld
Very nice project !
Your chosen microcontroller looks very powerfull , why such choice instead of a 32bits Arduino such as a STM32 base ? Hereby EEVblog that is showing how to get made a custom membrane keyboard : https://www.youtube.com/watch?v=H8XBBfvsPj0 From here : https://www.jrpanel.com/switch/buy/ (exemple @ about US$255 for 4 parts, with embossed keys , their stainless domes and 4 colors on the overlay) ![]() OK, bit expensive and not as good as a real keyboard, but has a professionnal look to it. Also I would be interrested by the software side of your project ;-) |
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08-01-2020, 05:58 AM
(This post was last modified: 09-10-2022 09:05 AM by F-73P.)
Post: #5
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RE: monic part 3: towards a handheld
Thanks for the suggestions. I've ordered Japanese "Alps Alpine" switches and keycaps, and have started making some keypad labels.
(07-28-2020 09:21 PM)Chr Yoko Wrote: Your chosen microcontroller looks very powerfull , why such choice instead of a 32bits Arduino such as a STM32 base ? The i.MX RT EVK boards offer speed and large memories, and the IDE is free and supports programming in C and assembly. (07-28-2020 09:21 PM)Chr Yoko Wrote: Hereby EEVblog that is showing how to get made a custom membrane keyboard : Thanks for the links, they look great. Definitely something to keep in mind for the future. The C language combines all the power of assembly language with all the ease-of-use of assembly language |
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10-25-2021, 08:27 AM
(This post was last modified: 09-10-2022 08:59 AM by F-73P.)
Post: #6
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RE: monic part 3: towards a handheld
Handheld prototype 1.0 is finished.
Schematics: ![]() ![]() Soldering the wires, buttons and connectors to the veroboard: ![]() ![]() Attaching the display and spacers: ![]() ![]() Connecting the microcontroller: ![]() ![]() The shift functions: ![]() The final result: ![]() The C language combines all the power of assembly language with all the ease-of-use of assembly language |
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09-10-2022, 08:58 AM
(This post was last modified: 09-10-2022 09:06 AM by F-73P.)
Post: #7
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RE: monic part 3: towards a handheld
Recently I bought an MIMXRT1160-EVK development board and 5.5" display. All going well I'll use these to make a second prototype featuring a QWERTY keypad.
![]() The C language combines all the power of assembly language with all the ease-of-use of assembly language |
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09-12-2022, 11:51 AM
Post: #8
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RE: monic part 3: towards a handheld
Brilliant ! Thanks to keep us informed !
Maybe you want to create a kind of Sharp PC G850VS ? (Basic ; C ; Z80) ![]() |
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09-16-2022, 05:22 AM
(This post was last modified: 12-28-2022 01:25 AM by F-73P.)
Post: #9
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RE: monic part 3: towards a handheld
(09-12-2022 11:51 AM)Chr Yoko Wrote: Brilliant ! Thanks to keep us informed ! Thanks, yes something similar: ![]() The C language combines all the power of assembly language with all the ease-of-use of assembly language |
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