Nyquist Keyboard PCBs - 60% Split Ortholinear

Coming Soon! Nyquist Rev. 3!

Nyquist/Levinson Rev. 3 info:

The Nyquist Rev. 3 features an on-board controller (ATmega32u4) with DFU bootloader and USB-C port. The PCBs are compatible with the currently available Nyquist cases and the SP50 case. The bottom row can be broken off to turn it into a Levinson (no 2u support in that configuration). Supports MX, Alps, and Kailh Choc switches. 6 RGB underglow LEDs on each half.

Item Notes for Rev. 2

The PCB Kit includes the following:

• 2 Nyquist PCBs
• 2 Push buttons for reset
• 2 TRRS jacks (no need to buy separately)
• 2 4.7kΩ resistors
• 60 1N4148 diodes

For LED support with the Rev. 2 PCBs, the MOSFET and resistors for the MOSFET are available separately via the LED Support Add-on Kit.

Layout

Each half of the board is a 5x6 matrix, but there is the option to have a 2u key in the lower left and right corners in place of 2 1u keys. The spot for the 2u has holes for Cherry PCB mounted stabilizers.

There's also a spot on the PCB for a pushbutton switch to reset the Pro Micro for flashing. No more taking a wire/tweezers/screwdriver to jump the Reset and GND pins!

Colors

• White with Black Text (Rev. 2)

The Name

The name Nyquist comes from the Nyquist sampling theorem, which says that if you want to sample a signal to convert it from analog to digital and be able to uniquely reconstruct the signal later, then the sample rate has to be twice the bandwidth of the signal. So here, if you want to sample this PCB, you're going to need 2 of them.

Firmware

The Nyquist uses QMK for its firmware, and the code for it has been merged into the main codebase. You can find it here: QMK - Nyquist directory. The pins used on the Pro Micro are the same as the ones used by the Let's Split, with the exception of the additional row of course, so it is actually backwards-compatible with a Let's Split (if you flash both with the Nyquist firmware).

Case

Here's the case files for a sandwich-style case are available here: Nyquist v1 Case Files

The kerf setting was set to 0.15mm for use with Lasergist and Ponoko.

Items needed for build

• 30 Diodes per PCB (included with this item, through-hole and SMD diodes supported)
• 2 Arduino Pro Micro or Elite-C (you can mix and match)
• 2 Push buttons (included with this item)
• 2 4.7k resistors if using I2C
• Switches - Alps or MX-compatible
• Case - We have a few different types available
• Acrylic
• Stainless Steel
• PCB plates
• 2 TRRS jacks (included with this item)
• TRRS cable
• Micro USB cable
• Optional - 2u PCB mount MX stabilizer if using 2u keys
• Optional (Rev. 2 only) - LED support components
• Optional (Rev. 2 only) - LEDs and 470Ω resistors

Build Guide: Nyquist Build Guide