First commit

README.md

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+## https://petrovs.info/post/2023-01-12-shaiba/

rotary_keyboard.ino

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+/* Project Shaiba (c) 2023 Blagovest Petrov <blagovest@petrovs.info>
+ * https://petrovs.info/post/2023-01-12-shaiba/
+ * Used https://www.instructables.com/Interface-a-rotary-phone-dial-to-an-Arduino/ for a reference.
+ * Hardware:
+ *   OLIMEXINO-85-ASM ( https://www.olimex.com/Products/Duino/AVR/OLIMEXINO-85-ASM/open-source-hardware )
+ *   Old rotary dialer from auction.
+ *   A lot of insulating tape :)
+ * 
+  */
+
+#include "DigiKeyboard.h"
+
+#define IMPULSE_PIN 2
+//Those values may be different for different encoders!
+#define TIME_TO_FINISH 100
+#define DEBOUNCE_DELAY 10
+
+int needToPrint = 0;
+int count;
+int lastState = LOW;
+int trueState = LOW;
+unsigned long lastStateChangeTime = 0;
+int cleared = 0;
+
+void setup() {
+  pinMode(IMPULSE_PIN, INPUT);
+}
+
+void loop() {
+  int reading = digitalRead(IMPULSE_PIN);
+
+  if ((millis() - lastStateChangeTime) > TIME_TO_FINISH) {
+    // the dial isn't being dialed, or has just finished being dialed.
+    if (needToPrint) {
+      // if it's only just finished being dialed, we need to send the number down the serial
+      // line and reset the count. We mod the count by 10 because '0' will send 10 pulses.
+      if (count > 10) { count = 1; }
+      DigiKeyboard.print(count - 1);
+      needToPrint = 0;
+      count = 0;
+      cleared = 0;
+    }
+  }
+
+  if (reading != lastState) {
+    lastStateChangeTime = millis();
+  }
+  if ((millis() - lastStateChangeTime) > DEBOUNCE_DELAY) {
+    if (reading != trueState) {
+
+      trueState = reading;
+      if (trueState == HIGH) {
+        // increment the count of pulses if it's gone high.
+        count++;
+        needToPrint = 1;  // we'll need to print this number (once the dial has finished rotating)
+      }
+    }
+  }
+  lastState = reading;
+}