.

examples/led_pwm.py

@@ -0,0 +1,31 @@
+import machine
+from machine import Pin
+import time, math
+
+ONBOARD_LED = 10	# GPIO10, PIN 7
+ONBOARD_BTN = 3		# GPIO3, 13
+
+# Configure on-board LED and push button
+# Stated GPIOs correspond to the wiring schematic
+onboard_button = Pin(ONBOARD_BTN, Pin.IN, Pin.PULL_UP)
+
+led = machine.PWM(ONBOARD_LED, freq=1000)
+
+def pulse(l, t):
+    for i in range(20):
+        l.duty(int(math.sin(i/10 * math.pi) * 500 + 500))
+        time.sleep_ms(t)
+    l.duty(0)
+        
+# Interrupt function to turn LED ON when on-board button is pressed
+def button_interrupt(pin):
+    pulse(led, 70)
+        
+        
+def main():
+    
+    # Assign interrupt to the on-board push button
+    onboard_button.irq(trigger=Pin.IRQ_FALLING, handler=button_interrupt)
+    
+if __name__ == '__main__':
+    main()