init

.gitignore

@@ -0,0 +1,5 @@
+.pio
+.vscode/.browse.c_cpp.db*
+.vscode/c_cpp_properties.json
+.vscode/launch.json
+.vscode/ipch

.vscode/extensions.json

@@ -0,0 +1,10 @@
+{
+    // See http://go.microsoft.com/fwlink/?LinkId=827846
+    // for the documentation about the extensions.json format
+    "recommendations": [
+        "platformio.platformio-ide"
+    ],
+    "unwantedRecommendations": [
+        "ms-vscode.cpptools-extension-pack"
+    ]
+}

platformio.ini

@@ -0,0 +1,14 @@
+; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; https://docs.platformio.org/page/projectconf.html
+
+[env:uno]
+platform = atmelavr
+board = uno
+framework = arduino

rotary-kb.py

@@ -0,0 +1,38 @@
+#!/bin/env python3
+import serial
+import time
+from pynput import mouse, keyboard
+
+PORT = "/dev/ttyACM1"
+
+keys = list(" abcdefghijklmnopqrstuvwxyz") + [keyboard.Key.enter]
+keys_display = " abcdefghijklmnopqrstuvwxyz\\"
+
+kb = keyboard.Controller()
+arduino = serial.Serial(port=PORT, baudrate=9600, timeout=.1)
+
+active_btn = -1
+
+pos = 0
+
+def print_state():
+	global pos
+	print(keys_display)
+	print(" " * pos + "^")
+
+while True:
+	event = arduino.readline().decode("utf-8").replace("\r\n", "")
+	if event:
+		if event.startswith("btn."):
+			state = event[4]
+			if state == "0":
+				kb.press(keys[pos])
+				active_btn = pos
+			else:
+				kb.release(keys[active_btn])
+				active_btn = -1
+			# print(event)
+		else:
+			pos = int(event)
+			print_state()
+

src/main.cpp

@@ -0,0 +1,81 @@
+#include <Arduino.h>
+
+#define PIN_BTN 5
+
+#define PIN_A 11 // Connected to CLK
+#define PIN_B 8	// Connected to DT
+int rotation = 0;
+int prev_a;
+int prev_btn;
+//#define DEBUG
+
+void setup() {
+	pinMode (PIN_A, INPUT);
+	pinMode (PIN_B, INPUT);
+	pinMode (PIN_BTN, INPUT_PULLUP);
+
+	prev_a = digitalRead(PIN_A);
+	prev_btn = digitalRead(PIN_BTN);
+	Serial.begin(9600);
+}
+
+void loop() {
+	// debug_signal();
+	int a = digitalRead(PIN_A);
+	int btn = digitalRead(PIN_BTN);
+
+	if (a != prev_a){ // Means the knob is rotating
+		if (digitalRead(PIN_B) != a) {	// Means pin A Changed first - We're Rotating Clockwise
+			rotation++;
+			#ifdef DEBUG
+			Serial.print("CW  ");
+			#endif
+		} else {// Otherwise B changed first and we're moving CCW
+			rotation--;
+			#ifdef DEBUG
+			Serial.print("CCW ");
+			#endif
+		}
+		#ifdef DEBUG
+		Serial.print("pos: ");
+		#endif
+		Serial.println(rotation);
+	}
+	if (btn != prev_btn) {
+		Serial.print("btn.");
+		Serial.println(btn);
+	}
+
+	prev_btn = btn;
+	prev_a = a;
+}
+
+// void debug_signal() {
+// 	int a = digitalRead(PIN_A);
+// 	int b = digitalRead(PIN_B);
+// 	if (a != prev_a || b != prev_b) {
+// 		if (a) {
+// 			if (b) {
+// 				Serial.print("█");
+// 			}
+// 			else {
+// 				Serial.print("▀");
+// 			}
+// 		}
+// 		else {
+// 			if (b) {
+// 				Serial.print("▄");
+// 			}
+// 			else {
+// 				Serial.print(" ");
+// 			}
+// 		}
+// 	}
+// 	prev_a = a;
+// 	prev_b = b;
+// 	if (digitalRead(5) == LOW) {
+// 		Serial.println("");
+// 		delay(100);
+// 	}
+// }
+