Documenting how to make it

Author: emanuelen5

README.md

@@ -1,21 +1,48 @@
 # Pico Macro keyboard (CircuitPython)
+An easily reconfigurable macro keyboard that can press button combinations, like <kbd>ALT</kbd>+<kbd>Tab</kbd>. Suitable for using for shortcuts in a program, or for activating Auto-hotkey scripts.
+
+Built with the Raspberry Pi Pico and CircuitPython.
+
+![The finished macro keyboard](./doc/finished.png)
+
+# Hardware
+* A Raspberry Pi Pico
+* Some keyboard switches (I used *Durock T1 67g Tactile*).
+* Key caps for the switches (I used *Tai-hao rubber keycaps*).
+* An enclosure (if you have access to a 3D printer - this design worked for me: [`novaspirit#4812223@thingiverse.com`](https://www.thingiverse.com/thing:4812223), when I printed the lid with a skirt for adhesion, which suppressed deformations)
+
+## Assembly
+See the [fritzing schematics](./doc/fritzing) on how to assemble the keyboard (very simple).
+
+# Software
+The microcontroller was programmed with CircuitPython 7.0.0-rc.1.
 
 ## Installation
 
-### Install CircuitPython 7+ on the Pico
+### Flashing CircuitPython 7+ on the Pico
 * Download it from here: https://circuitpython.org/board/raspberry_pi_pico/
 * Hold the BOOTSEL button while plugging in the Pico.
 * Drop the CircuitPython.uf2 file in the Pico's CIRCUITPYTHON drive.
 
-### Upload the code to the Pico
-* Clone submodules etc.:
-  ```bash
+### Uploading the user code to the Pico
+* Initialize the code in this repository (clone submodules etc.):
+  ```console
   $ ./install.sh
   Cloning external submodules/libs
   Copying external libs into pico libs folder
   ```
-* Copy all files from the [pico](./pico) folder to your CircuitPython drive. And voilà!
+* Copy all files from the [pico](./pico) folder to your CircuitPython drive.
+* Unplug the Pico from the USB port, and plug it in again. Voilà!
 
-## Usage
-* Add mappings to config.json for the pins to key combinations
+# Usage
+* Add mappings to config.json for the pins to key combinations. The file shall contain an array. Each element is an array of strings. Each string is the name of a key to press. The entry shall be null to leave the key unconfigured. E.g.
+  ```json
+  [
+    ["A"], // Key 1 presses a (note that it is just the key, not the upper case character)
+    null, // Key 2 does not press any key combination
+    ["ALT", "Tab"], // Key 3 pressed ALT+Tab
+    // The rest of the keys are not configured
+  ]
+  ```
 * Hold down GP0 upon boot to enable only-keyboard mode
+* If any key is held down during boot, then the program will exit (as a kill-switch in case there is a short)