removed functions from callbacks test and used pico_led instead of LED to remove need for external components when running examples.

Author: pjbRPF

docs/examples/touch_sensor.py

@@ -1,15 +1,12 @@
-from picozero import TouchSensor, LED
+from picozero import TouchSensor, pico_led
 from time import sleep
 
 # Capacitive touch sensor output connected to pin 2
 touch = TouchSensor(2)
 
-# Built-in LED
-led = LED(25)
-
 while True:
     if touch.is_touched:
-        led.on()
+        pico_led.on()
     else:
-        led.off()
+        pico_led.off()
     sleep(0.1)

docs/examples/touch_sensor_callbacks.py

@@ -1,28 +1,16 @@
-from picozero import TouchSensor, LED
+from picozero import TouchSensor, pico_led
 from time import sleep
 
 # Capacitive touch sensor output connected to pin 2
 touch = TouchSensor(2)
 
-# Built-in LED
-led = LED(25)
-
-
-def touched():
-    led.on()
-
-
-def released():
-    led.off()
-
-
 # Set up event callbacks
-touch.when_touched = touched
-touch.when_touch_ends = released
+touch.when_touched = pico_led.on
+touch.when_touch_ends = pico_led.off
 
 # Keep the program running
 try:
     while True:
         sleep(1)
 except KeyboardInterrupt:
-    led.off()  # Turn LED off when exiting
+    pico_led.off()  # Turn LED off when exiting