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Working on v2

A project log for Teensy Thumb Keyboard

Handheld tactile switch keyboard for Teensy 3.2 compatible boards.

Anthony DiGirolamoAnthony DiGirolamo 06/22/2019 at 01:374 Comments

Good news everyone! I'm working on a version 2.0 board that operates over i2c using the TCA8418. This will be my first project using SMD parts and so far so good.

For switches I picked the EVQ-Q2B03W. They are more pricey than your typical tactile switch but are worth the cost in my opinion. The datasheet says they require 0.5 N of force to press, are 3.1 mm tall and are rated at 2,000,000 presses. They are VERY light touch, it really doesn't require much more force than just typing on your phone screen.

It breaks out all the usual bits and includes a JST-PH connector for i2c that is compatible with Adafruit's PyBadge and PyGamer.

Next steps will be: 

Discussions

Le Roux Bodenstein wrote 01/22/2020 at 14:07 point

Interesting. I happened to pick the exact same switches for a little sequencer/drum machine/synthesizer project I just started. For the same reasons - light to touch.

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Giovanni Bauermeister wrote 01/13/2020 at 19:12 point

Hi! Very nice design. Where can I find schematics for this V2 version? I'm not sure where to connect INT and RESET pins. Thanks.

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Mark Trevor Birss wrote 01/13/2020 at 06:33 point

Very nice, have you seen this smaller MEGA328P I2C keybaord M5Stack CardKB -  https://m5stack.com/products/cardkb-mini-keyboard

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jay wrote 08/11/2019 at 02:52 point

where do i buy this 

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