![]() ![]() Pro Micro-compatible 32u4 Breakout Board. ShiroMicro is a ProMicro clone with Mid-Mount USB Type-C connector by /u/elfmimi. Several boards followed (by Sparkfun and Adafruit) featuring this chip.Īn USB-C Pro Micro version available at booth.pm.Īnother Pro Micro pinout compatible board with mid-mounted USB C, this time by Dr_Derivative: geekhack thread and GitHub repo.Ģ3 IO pins, sturdy through-hole USB C connector, Pro Micro compatible pin footprint.Īdded Li-Po charger, USB Type-C and a physical ON/OFF switch. Raspberry entered the microcontroller scene with their RP2040 and the Pi Pico board. ![]() Because of the lack of integrated USB support, these projects use V-USB and USBaspLoader to integrate the USB interface part in the bootloader. Various kits and builds appeared with exposed through-hole components featuring the good old Atmega328P. Here is a Atmel32U4 pinout with pin names. Fortunately, nice pinouts are there to help. A2, E5) in your firmware code, in documentations and data sheets.Ĭonfusingly, pin names of the microcontroller and markings on the development board's PCB may differ. To build larger keyboards you may need to hack the Pro Micro or choose another development board with more pins.Ī pinout is a map of pin names and functions. While the Atmel32U4 has 26 I/O pins, only 18 of those are easily accessible on Pro Micro. The number of pins defines the maximal number of keys in the keyboard matrix. The number of easily accessible GPIO pins is probably the most crucial property of a controller/development board in a custom keyboard project. The Pico lacks QMK support at the moment. However, combined with CircuitPython and KMK firmware, it allows a different workflow for people regularly updating their keymaps. ![]() At first sight it may seem an overkill for a keyboard project. The RP2040 is cheap, feature-rich and way more powerful than an Atmega32U4. However, early 2021, a new contender entered the stage: the Raspberry Pi Pico board and the RP2040 microcontroller, plus the Sparkfun and Adafruit boards using the same RP2040 chip. Elite-C, Proton C) differ mostly in the connector type (USB micro vs. For years, the Teensy family was your option when you ran out of the pins of a Pro Micro ( Pro Micro vs. There are several development boards for keyboard building with Pro Micro being the cheapest ($3) and probably most popular. Other microcontrollers are also available, but their features (higher frequency, larger memory, more pins) are mostly overkill for a small keyboard project.ĭevelopment boards make programming the microcontroller and access of I/O pins very easy.Ĭolloquially known as "controllers", they are microcontrollers put on a small piece of PCB surrounded by all the necessary stuff (USB connector, voltage regulator, clock crystal, status LEDs, resistors, capacitors etc.) to be able to work and communicate with it right out of the box. It's quite an overkill for a keyboard but it's able to run CircuitPython and KMK (e.g. An electronic project can be recognized as an actual keyboard by your OS without the need for an external USB interface to program it. The Atmega32U4 was the first popular one offering integrated USB connectivity. The most popular microcontrollers for keyboard projects nowadays are the Atmega32U4 and the RP2040. It runs the firmware (your program) to detect keypresses. The brain of your project, a really fascinating little thing.Ī microcontroller is like a computer on its own with integrated CPU, memory and storage space all in a tiny socket (7x7mm). The microcontroller is the central element of your circuit. Both microcontrollers and development boards are referred to by this name. The term "controller" is used quite ambiguously in keyboard building. ShiroMicro ? - Atmega32U4 32K 28K 2.5K 1K Mid-mount USB-CĪrduino Nano 14 22? 15$ 2$ Atmega328P 32K 28K 2K 1K 45x18 - just for reference
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