Add asyncio example

Author: sebromero

examples/knob_async.py

@@ -0,0 +1,48 @@
+"""
+This example shows how to use the ModulinoKnob class to read the value of a rotary encoder knob asynchronously.
+
+Asyncio is used to read the knob value and to blink the built-in LED at the same time.
+The knob is used to increase or decrease a value. The knob is rotated clockwise to increase the value and counter-clockwise to decrease it.
+
+You can register callbacks for the following events:
+- Press: The knob is pressed.
+- Release: The knob is released.
+- Rotate clockwise: The knob is rotated clockwise.
+- Rotate counter clockwise: The knob is rotated counter clockwise.
+
+Initial author: Sebastian Romero (s.romero@arduino.cc)
+"""
+
+from modulino import ModulinoKnob
+from machine import Pin
+import asyncio
+
+led = Pin("LED_BUILTIN", Pin.OUT)
+
+knob = ModulinoKnob()
+
+knob.on_press = lambda: print("🔘 Pressed!")
+knob.on_release = lambda: print("🔘 Released!")
+knob.on_rotate_clockwise = lambda steps, value: print(f"🎛️ Rotated {steps} steps clockwise! Value: {value}")
+knob.on_rotate_counter_clockwise = lambda steps, value: print(f"🎛️ Rotated {steps} steps counter clockwise! Value: {value}")
+
+async def blink_led():
+    while True:
+        led.value(0)
+        await asyncio.sleep(0.5)
+        led.value(1)
+        await asyncio.sleep(0.5)
+    
+async def read_knob():
+    while True:
+        if(knob.update()):
+            print("👀 Knob value or state changed!")
+        await asyncio.sleep_ms(20)
+
+async def main():
+    await asyncio.gather(
+        blink_led(),
+        read_knob()
+    )
+
+asyncio.run(main())