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Button

Overview

The Button sample demonstrates the use of GPIO input using the digitalio module. It prints a message to the console each time the state of the button changes.

The table below shows the available button on the nRF52840 Connect Kit:

Button Alias
USER Button USER

Requirements

Before you start, check that you have the required hardware and software:

Running the code

To run the code, complete the following steps:

  1. Connect nRF52840 Connect Kit to your computer using the USB-C Cable.
  2. Start Mu Editor, click Load to open code.py in the CIRCUITPY drive.

  3. Copy and paste the following code into code.py and click Save:

    CIRCUITPY/code.py
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    import board
import digitalio

# User Button
button = digitalio.DigitalInOut(board.USER)
button.direction = digitalio.Direction.INPUT
button.pull = digitalio.Pull.UP

last_value = button.value

while True:
    if last_value != button.value:
        last_value = button.value
        print('Button is ' + ('released' if button.value else 'pressed'))

  4. Your code will run as soon as the file is done saving. Click Serial on Mu Editor's Top Menu to open a serial console. Observe the output of the console and press the USER button. You should see the output, similar to what is shown in the following:

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    Code stopped by auto-reload. Reloading soon.

Auto-reload is on. Simply save files over USB to run them or enter REPL to disable.
code.py output:
Button is pressed
Button is released
Button is pressed
Button is released
...