Turning A Typewriter Into A Mechanical Keyboard

Is your keyboard too quiet? Is your Cherry MX Blue board not driving your coworkers crazy enough? If the machine gun fire of a buckling spring keyboard isn’t enough for you, there’s only one solution: [Russell]’s typewriter turned into a mechanical keyboard.

Converting typewriters into keyboards has been done for a very long time; teletypes, the first computer keyboards, were basically typewriters, and the 1970s saw a number of IBM Selectrics converted into a keyboard with serial output. Even in recent years, typewriters have been converted into keyboards with the help of some switches and an ATMega. [Russell]’s mechanical keyboard improves on all of these builds by making the electronic interface dead simple, and a project that can be done by anyone.

Instead of installing switches underneath every key or futzing about with the weird mechanics of a Selectric typewriter, [Russell] is only installing a touch-sensitive position sensor into the frame of the typewriter. When a key is pressed, it strikes a crossbar in the frame of the typewriter. With a single ADC chip and a Raspberry Pi, [Russell] can determine which key was pressed and use that information to output a character to a terminal.

It’s a very simple solution for an electrical interface to a mechanical device, and the project seems to work well enough. [Russell] is using his new keyboard with Vim, even, something you can check out in the video below.

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Arduino Synth Guitar Really Rocks

[Gr4yhound] has been rocking out on his recently completed synth guitar. The guitar was built mostly from scratch using an Arduino, some harvested drum pads, and some ribbon potentiometers. The video below shows that not only does it sound good, but [Gr4yhound] obviously knows how to play it.

The physical portion of the build consists of two main components. The body of the guitar is made from a chunk of pine that was routed out by [Gr4yhound’s] own home-made CNC. Three circles were routed out to make room for the harvested Yamaha drum pads, some wiring, and a joystick shield. The other main component is the guitar neck. This was actually a Squire Affinity Strat neck with the frets removed.

For the electronics, [Gr4yhound] has released a series of schematics on Imgur. Three SoftPot membrane potentiometers were added to the neck to simulate strings. This setup allows [Gr4yhound] to adjust the finger position after the note has already been started. This results in a sliding sound that you can’t easily emulate on a keyboard. The three drum pads act as touch sensors for each of the three strings. [Gr4yhound] is able to play each string simultaneously, forming harmonies.

The joystick shield allows [Gr4yhound] to add additional effects to the overall sound. In one of his demo videos you can see him using the joystick to add an effect. An Arduino Micro acts as the primary controller and transmits the musical notes as MIDI commands. [Gr4yhound] is using a commercial MIDI to USB converter in order to play the music on a computer. The converter also allows him to power the Arduino via USB, eliminating the need for batteries.

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Stribe 1 kits available


We first spotted the Stribe music controller at Maker Faire. [Josh Boughey] has since refined the controller’s design so that it can be constructed in a modular fashion and it’s being sold in kit form by Curious Inventor. The kit has two columns of 64 LEDs and a Spectra Symbol SoftPot for control. You can daisy chain eight modules together using a ribbon cable. It uses SPI control, with a separate wire for the data line (not in the ribbon). An Arduino is used to hook the controller to programs like Max/MSP.