Add getDirection() support to ModulinoKnob and example ⚡ (#34)

* feat(buttons): allow isPressed() to accept 'A', 'B', 'C' as input

Added support for character and string-based input to `isPressed()` in `ModulinoButtons`,
so it now accepts both index (0–2) and letter identifiers (`'A'`, `'B'`, `'C'`) matching
the physical button labeling.

Closes #3

* Update example to document support for both numeric and letter indices ♻️

* Add getDirection() support to ModulinoKnob and example ⚡

* Fix: 🔥

* Fix: restore files 🔥

* Minor fixes ♻️

* Update API docs ♻️

* Update API docs ♻️

* Update examples/Modulino_Knob/Knob_Basic/Knob_Basic.ino

---------

Co-authored-by: Leonardo Cavagnis <45899760+leonardocavagnis@users.noreply.github.com>

Author: AntonioBerna

docs/api.md

@@ -90,6 +90,12 @@ Represents a Modulino Knob module.
 - **`bool isPressed()`**  
   Returns `true` if the button on the knob is pressed, `false` otherwise.
 
+- **`int8_t getDirection()`**
+  Returns the direction of the knob rotation.  
+  - `1` for clockwise
+  - `-1` for counter-clockwise
+  - `0` if no movement is detected
+
 - **`void set(int16_t value)`**  
   Sets the knob value.
 

examples/Modulino_Knob/Knob_Basic/Knob_Basic.ino

@@ -24,6 +24,8 @@ void loop(){
   int position = knob.get();
   // Check if the knob has been pressed (clicked)
   bool click = knob.isPressed();
+  // Get the rotation direction
+  int8_t direction = knob.getDirection();
 
   Serial.print("Current position is: ");
   Serial.println(position);
@@ -32,4 +34,11 @@ void loop(){
     Serial.println("Clicked!");
   }
 
-}
+  if (direction == 1) {
+    Serial.println("Rotated clockwise");
+  } else if (direction == -1) {
+    Serial.println("Rotated counter-clockwise");
+  }
+
+  delay(10); // optional small delay to reduce serial spam
+} 

src/Modulino.h

@@ -243,8 +243,9 @@ class ModulinoKnob : public Module {
   bool begin() {
     auto ret = Module::begin();
     if (ret) {
-      // check for set() bug
       auto _val = get();
+      _lastPosition = _val;
+      _lastDebounceTime = millis();
       set(100);
       if (get() != 100) {
         _bug_on_set = true;
@@ -277,6 +278,24 @@ class ModulinoKnob : public Module {
     get();
     return _pressed;
   }
+  int8_t getDirection() {
+    unsigned long now = millis();
+    if (now - _lastDebounceTime < DEBOUNCE_DELAY) {
+      return 0;
+    }
+    int16_t current = get();
+    int8_t direction = 0;
+    if (current > _lastPosition) {
+      direction = 1;
+    } else if (current < _lastPosition) {
+      direction = -1;
+    }
+    if (direction != 0) {
+      _lastDebounceTime = now;
+      _lastPosition = current;
+    }
+    return direction;
+  }
   virtual uint8_t discover() {
     for (unsigned int i = 0; i < sizeof(match)/sizeof(match[0]); i++) {
       if (scan(match[i])) {
@@ -288,6 +307,9 @@ class ModulinoKnob : public Module {
 private:
   bool _pressed = false;
   bool _bug_on_set = false;
+  int16_t _lastPosition = 0;
+  unsigned long _lastDebounceTime = 0;
+  static constexpr unsigned long DEBOUNCE_DELAY = 30;
 protected:
   uint8_t match[2] = { 0x74, 0x76 };
 };