An example for ESP32-S3 circuitpython board, key control and simple led breathing effect

esp32-s3-circuitpython-key-led.py

import time
import board
import neopixel_write
import digitalio

class LED:
    def __init__(self, pin):
        self.pin = digitalio.DigitalInOut(pin)
        self.pin.direction = digitalio.Direction.OUTPUT
        self.ts = self.ms
        self.cnt = 0
        self.sta = 0
        self.step = 1
        self.max = 16

    @property
    def ms(self):
        return int(time.monotonic() * 1000)

    def off(self):
        self.cnt = 0
        self.sta = 0
        self.write(0, 0, 0)

    def write(self, R, G, B):
        neopixel_write.neopixel_write(self.pin, bytearray([G, R, B]))
        # print(f"{R} {G} {B}")

    def blink(self):
        if self.ms - self.ts < 500:
            return

        self.ts = self.ms
        if self.sta == 0:
            self.sta = 1
            self.off()
        elif self.sta == 1:
            self.sta = 0
            self.write(8, 0, 0)

    def breath(self):
        if self.cnt == 0:
            if self.ms - self.ts < 400:
                return
        else:
            if self.ms - self.ts < 80:
                return

        self.ts = self.ms
        self.cnt += self.step
        if self.cnt == 0:
            self.step = 1
        elif self.cnt == self.max - 1:
            self.step = -1

        R = self.cnt % self.max
        G = self.cnt // self.max % self.max
        B = self.cnt // self.max // self.max
        led.write(R, R, R)

class KEY:
    def __init__(self, pin) -> None:
        self.pin = digitalio.DigitalInOut(pin)
        self.pin.direction = digitalio.Direction.INPUT
        self.ts = self.ms
        self.sta = 0

    @property
    def ms(self):
        return int(time.monotonic() * 1000)

    def get(self):
        if self.ms - self.ts < 10:
            return 0
        self.ts = self.ms
        if self.sta == 0:
            if not self.pin.value:
                self.sta = 1
        elif self.sta == 1:
            if not self.pin.value:
                self.sta = 2
                return 1
        elif self.sta == 2:
            if self.pin.value:
                self.sta = 0
                return 2
        return 0

print()
led = LED(board.IO48)
led.off()
key = KEY(board.IO0)
stop = False
while True:
    if not stop:
        led.breath()
        # led.blink()
    sw = key.get()
    if sw != 0:
        print(f"{sw}")
        if sw == 1:
            stop = not stop
            if stop:
                led.off()