🛠 Réagir aux boutons A, B et au pad tactile du logo

Objectives

Use the two physical buttons A (internal pin P0.14) and B (P0.23) as well as the capacitive touch logo (FACE_TOUCH, P1.04) specific to the V2, to control the display of the 5×5 matrix.

Materials

• 1 micro:bit V2 board
• 1 micro-USB cable (or battery via JST-PH connector)
• Optional: two alligator clips connected to P0/P1 to test the touch sensitivity of the rings

Complete code

from microbit import *

while True:
    if button_a.was_pressed:
        display.show(Image.HAPPY)
        sleep(600)
    elif button_b.was_pressed:
        display.show(Image.SAD)
        sleep(600)
    elif pin_logo.is_touched:
        display.show(Image.HEART)
        sleep(600)
    else:
        display.show(Image.SILLY)

was_pressed returns true only once per press (internal flag), which avoids unwanted repetitions. pin_logo.is_touched reads the capacitive pad of the large logo — a new feature of the V2; the rings P0, P1, P2 are also touch-sensitive.

Expected verification

Button A: happy smiley. Button B: sad face. Finger on the logo: heart. At rest: silly face. Each press changes the display immediately, without visible bouncing.

Common errors

• Using button_a.is_pressed in a fast loop: the action is triggered continuously; prefer was_pressed or events.
• Expecting touch response on P0 without connecting anything: the logo pad is the easiest to test without wires.
• On V1, pin_logo does not exist: AttributeError, check that you indeed have a V2.
• Forgetting a sleep: the program runs idle and consumes energy for nothing.