Differences

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--- using_a_breakout_button [2026/07/15 19:34] – [The Code] walkeradmin
+++ using_a_breakout_button [2026/07/15 20:02] (current) – walkeradmin
@@ Line 84: / Line 84: @@
     if button.value() == 0:   # Button pressed (LOW)
         print("Button pressed — stopping program.")
+        all_off()
         break                 # Exit the loop and end main.py
 ####################### CHECK BREAKOUT BUTTON ##########################
@@ Line 89: / Line 90: @@
 # Code End
 </code>
+There is on limitation on pressing the button, we need to look at this part of the code to understand it.
+\\
+<code:python | download>
+    # Red
+    all_off()
+    RED.on()
+    time.sleep(3)
+    # Red + Amber
+    AMBER.on()
+    time.sleep(1)
+    # Green
+    all_off()
+    GREEN.on()
+    time.sleep(3)
+    # Amber
+    all_off()
+    AMBER.on()
+    time.sleep(1)
+</code>
+In our code, to delay the LEDs so they cycle in time like a set of traffic lights would, we have four <color #ed1c24>time.sleep</color> statements, the total delay of these is 8 seconds. This means, when we press the button, depending on where we are in the loop, we might have to hold the button for up to 9 seconds before the button value is read.
+\\
+\\
+However, if you read the code, you can see the button value is read as the <color #ffc90e>Amber</color> LED is turned on after the <color #22b14c>Green</color> LED>. So it is quite easy to time right if you don't want to hold the button for 8 seconds.
+\\
+\\
+=== Example ===
+\\
+<color #ed1c24>***Remember*** - We must save this code to our Raspberry Pi Pico as a file called main.py.</color>
+\\
+\\
+This will enable to code to run on the Pico boot up.
+\\
+\\
+Here is the button in action.
+\\
+\\
+{{ :traffic-light-breakout-button-sim.mp4?900x634 |}}
+\\
+Using a button like this means you can never get you Pico stuck in a software loop with little to no way of recovery (without wiping it completely).
+\\
+\\
+----