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monic part 3: towards a handheld
07-01-2020, 01:54 AM (This post was last modified: 07-01-2020 02:06 AM by F-73P.)
Post: #1
monic part 3: towards a handheld
Previous: monic part 2: connecting the keypad

This post will show how to place the display and matrix keypad on veroboard:

[Image: 50063029253_e4b510632a_z.jpg]

The calculator can be connected to an NXP development board (such as the i.MX RT1010 I have been using so far) via the header pins on the left.

I am also looking into connecting a Teensy 4.1 to the veroboard to untether the device.

I am also trying to find keycaps for the Omron B3F-1052 pushbuttons; any suggestions?
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07-01-2020, 10:17 AM
Post: #2
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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