pimoroni-pico/micropython/examples/breakout_dotmatrix/eyes.py

import time
import math
import random

from pimoroni_i2c import PimoroniI2C
from breakout_dotmatrix import BreakoutDotMatrix

PINS_BREAKOUT_GARDEN = {"sda": 4, "scl": 5}
PINS_PICO_EXPLORER = {"sda": 20, "scl": 21}

i2c = PimoroniI2C(**PINS_BREAKOUT_GARDEN)
display = BreakoutDotMatrix(i2c)
start_time = time.time()


def eye(x, y):
    display.set_pixel(x, y, True)
    display.set_pixel(x, y + 1, True)
    display.set_pixel(x + 1, y, True)
    display.set_pixel(x + 1, y + 1, True)


while True:
    t = (time.time() - start_time) * math.pi

    # Get eye x and y positions in the range 0.0 to 1.0
    # You can plug in your own 0.0 to 1.0 values here
    x = (math.sin(t / 2) + 1) / 2
    y = (math.sin(t / 4) + 1) / 2

    # Multiply them up to display coords and convert to int
    x = math.floor(x * 3)
    y = math.floor(y * 5)

    # Clear the display
    display.clear()

    # Blink occasionally
    if not random.randint(0, 20) == 2:
        # Draw the eyes if not blinking
        eye(x, y)
        eye(x + 5, y)

    # Update the display at 10FPS
    # This gives our crude blink code time to not look like a random flicker
    display.show()
    time.sleep(1.0 / 10)