Tiny 2040: add button/LED example

micropython/examples/tiny2040/button_test.py

@@ -0,0 +1,28 @@
+# Simple demo of how to use the RGB LED and read the button on Tiny 2040.
+
+from pimoroni import Button, RGBLED
+import time
+
+led = RGBLED(18, 19, 20)
+button_boot = Button(23)
+
+# start with the LED off
+led.set_rgb(0, 0, 0)
+
+# flash the LED red, green and blue
+led.set_rgb(255, 0, 0)
+time.sleep(0.5)
+led.set_rgb(0, 255, 0)
+time.sleep(0.5)
+led.set_rgb(0, 0, 255)
+time.sleep(0.5)
+
+print("Press the button!")
+
+while True:
+    # flash the LED white when the button is pressed
+    if button_boot.read():
+        print("Button pressed!")
+        led.set_rgb(255, 255, 255)
+        time.sleep(0.5)
+    led.set_rgb(0, 0, 0)