You can use the Arduino IDE, NodeMCU and there are other development environments available. Wemos D1 ESP8266 based board. There is a USB connector, note that its a micro type and you can use this and also OTA for programming. I used the USB cable, it was the easiest way.FlexiColorPicker - A pure JavaScript color picker - no images, external libraries, CSS or 1px divs.Espressif Wemos D1 Mini.The two overlapping black and white gradient rectangles of the picker represent the saturation and value values. The top level elements ( in case of SVG enabled browser and in case of VML enabled browser) that wrap each of the slider and picker gradient rectangles have set width and height to 100% which means that the color picker components (slider and picker) adjust themselfs automatically to the dimensions of the slider and picker HTML elements. This is the no-hassle form of creating the color picker.
This is going to the the base I build on with an aim to designing, testing and producing a selection of full keyboards. Two different microcontrollers will be demonstrated (ATMegs32A, ATMega328P) and it should provide a solid starting point for anyone wishing to build a keyboard from the ground up. This is a relatively complete guide on how to build a mechanical keyboard prototype and get it functioning with QMK. Stan app for macAn old USB cable or a USB header, something to get the connection from your pc to the microcontroller. Something to program a bootloader on the microcontroller, I use a Pro Micro for this task, you can use a Raspberry Pi. A ATMega32A or ATMega328P AVR microcontroller, either will do for this test, the 32A may be preferred if you plan to build a larger keyboard as it has more available lines. A 1.5k resistor, part of the USB data line voltage drop circuit (level adjustment). 7uF electrolytic capacitor to smooth the USB power lines. 2 x 68R resistors for the USB data lines. 2 x 22pF ceramic capacitors, part of the clock circuit. A 16Mhz crystal, part of the clock circuit. It makes no difference what you use, you just require VCC / GND / D+ / D – from a USB port to your project. A two pin header or dip switch or a jumper wire, something to short two pins to force the microcontroller into bootloader mode.I do all of my work on Macs so the software will be presented as if the reader is using this platform, I believe all the tools are cross platform but I cannot comment on their use or setup on Windows or Linux as they are not platforms I have used them on. A breadboard to plug all the parts into. A selection of solid cable to make up jumper wires or pre-made jumper cables. 4 x 1N4148 diodes two for the keyboard matrix and two to drop the USB data lines to the correct voltage (technically these should be 3.6v zener diodes like these but 1N4148 have worked for me and I had them already, and it should be ok for testing). ![]() Wemos D1 Mini Emulator Download The FirmwareDownload the firmware and QMK toolbox, install QMK toolbox and connect your Pro Micro.You should open QMK toolbox and see that it has detected the Pro Micro, it should say something similar to the following.At the top of the page, click open and locate the firmware file you downloaded. Preparing the programmerFirst must flash a specific firmware to the Pro Micro, the firmware in question is mentioned above and is derived from the QMK ISP Flashing Guide. For this guide I will discuss using a Pro Micro and leave other options to the reader. To flash a bootloader you will require a device to do the loading (a programmer), I chose to use a Pro Micro board as I have a few available, you could use a Raspberry PI or a Teensy. Flashing a bootloader and setting fusesThe first stage to the project will be flashing a bootloader on the microprocessor of choice, the process will be exactly the same regardless witch of the two chips you use (but fuse settings will be different). I have produced a simple Fritzing diagram of the required wiring for both microprocessors. You will then need to connect the relevant pins from the programmer to the breadboard. Mechanical Keyboard Prototype – Flash Pro Micro With ISP Firmware Preparing the microcontroller and wiring the programmerYou will need to layout the microprocessor on a breadboard, provide power and ground lines and wire up the crystal (including two capacitors) to provide a clock signal. Openoffice for mac downloadMechanical Keyboard Prototype – AVR ISP ReadThe final stage before flashing the bootloader is to set the fuses. If not check your wiring and make sure the programmer flashed successfully. Mechanical Keyboard Prototype – ATMega32A Flash Bootloader Circuit Mechanical Keyboard Prototype – ATMega328P Flash Bootloader Circuit Configuring, compiling and flashing the bootloaderNow we have our programmer wired and ready to go we need to configure the bootloader before we flash it onto the microcontroller.I am going to assume you have a working build environment and have downloaded (and setup) QMK source and the USBaspLoader, if not please set this up now.We need to make some changes to the bootloader config to reflect what microcontroller we are using and to also configure the default USB pins (QMK uses PD2 and PD3 for USB to make life easier we will use the same).In the root directory of USBaspLoader make the following changes to the Makefile.inc file, make sure you set the correct microcontroller.Avrdude -c avrisp -p m32 -P /dev/cu.usbmodem123451 -vYou should get a return detailing the programmer and attached microprocessor, you should see it read ok and return normally as per the following image. ![]() Flashing QMKNow everything is wired we can proceed to configuring and flashing QMK on the keyboard, once this is done you will have a functional prototype.I am going to assume you have configured a working QMK build environment, if you have not yet done so please do this now before proceeding.Copy the relevant files from my dev_scarlet build of QMK into the keyboards/ghostseven/scarlet folder in your QMK environment.Depending on what microprocessor you are using change the keyboards/ghostseven/scarlet/rules.mk file accordingly.Qmk compile -kb ghostseven/scarlet -km defaultThis should compile and produce an output similar to the following, you should end up with a ghostseven_scarlet_default.
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