Difference: RaspiElfKeypad (6 vs. 7)

Revision 72018-05-16 - PeterSchmid

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Intro

The Elf Membership Card has 8 data switches, 3 mode switches, and a IN push button on its front panel. The data is displayed on 8 LEDs (binary). It is a error prone but educational task to "switch in" in (load) the program.

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I have an old external keypad because my old notebook did not have a numeric keypad. The keys looks similar to those old Elf hex keypads, why not use this spare keypad for the Elf Membership Card? It is a Cherry keyboard and I have other Cherry keyboard with the same key caps.

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I have got an old external keypad because my old notebook did not have any numeric keypad. The keys looks similar to those old Elf hex keypads, why not use this spare keypad for the Elf Membership Card? It is a Cherry keyboard and I have an other Cherry keyboard with the same type of key caps and it was easy to replace the two upper rows with the A to F caps.

Contents

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Hardware

Cherry Keypad G84-4700, original key caps

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LTP-305 Dot Matrix Display

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Hex Keypad

Microdot_pHAT on Raspberry Pi Zero

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Comments

META FILEATTACHMENT	attachment="gal_2000_G84-4700_2_persp.jpg" attr="" comment="" date="1525901809" name="gal_2000_G84-4700_2_persp.jpg" path="gal_2000_G84-4700_2_persp.jpg" size="90914" user="PeterSchmid" version="1"

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META FILEATTACHMENT	attachment="hex-keypad.jpg" attr="" comment="" date="1526500836" name="hex-keypad.jpg" path="hex-keypad.jpg" size="468139" user="PeterSchmid" version="1"

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