2. Buttons#

Pico:ed contains two keys: A and B.

2.1. Attributes#

button_a#

An instance of a class Button representing the button on the left.

button_b#

An instance of a class Button representing the button on the right.

2.2. Classes#

class Button(pin)#

It is for representing a button.

  • unit - Button pins

**is_pressed()**

Returns “True” if the button is pressed, otherwise it returns “False”.

**was_pressed()**

Returns “True” if the button is pressed and only once before the next press.

2.3. Example#

1.Controls the LED

# Import the modules that we need for the program
from picoed import *

#  While true, detect if buton A is pressed and also the status of the LED
while True:
    if button_a.is_pressed():
        led.on()
    else:
        led.off()

  1. Count the times of pressing the buttons

from picoed import *

times = 0
display.show(times)

while True:
    # Press button A once, count minus 1
    if button_a.was_pressed():
        times -= 1
        display.show(times)
    # Press button_B once, add 1 to the count
    if button_b.was_pressed():
        times += 1
        display.show(times)