2.5 Button Module

A button module is a digital input device that detects when it is pressed. It is commonly used to start or stop processes in a project.

Example Applications:

• Robot mode selector
• Manual control triggers
• Game controllers

2.5.1 Example Code for the Button

This particular button typically outputs HIGH (1) when not pressed and LOW (0) when pressed. To detect a button press, we can use a NOT logic block to reverse the signal.

• Start by connecting the button module to one of the available single-pin ports using the provided Type-C cable.
• Choose the corresponding pin on the controller to which the button is connected, for example, P0, P1, or P2.
• Drag an if condition block to your workspace to handle logic when the button is pressed.
• From the logic section, drag a NOT operator block and place it inside the if condition block.
• Drag the READ function block and place it inside the NOT block.
• From the dropdown in the READ block:
  • Select button as the sensor type.
  • Select the pin connected to your button (e.g., P0).
• Inside the if block:
  • Drag a block to turn on the blue LED.
  • Then drag a ScreenDisplay block and use it to print the word "Pressed" on the screen.
• Explanation:
  • The button outputs 1 when not pressed and 0 when pressed.
  • The NOT operator inverts the signal so that the if condition is true when the button is actually pressed.

_{Figure 2.5.1a: Button press detection and LED activation using block-based logic with NOT operator}