Internet Clock using Maker Pi Pico and CircuitPython.

code.py

"""
  Internet Clock using Maker Pi Pico and CircuitPython

  Items:
  - Maker Pi Pico
    https://my.cytron.io/p-maker-pi-pico
  - ESP8266 ESP-01 WiFi Serial Transceiver Module
    https://my.cytron.io/p-esp-01-wifi-serial-transceiver-module-esp8266
  - 4 In 1 MAX7219 Dot Matrix Display Module
    https://my.cytron.io/p-4-in-1-max7219-dot-matrix-display-module
  - USB Micro B Cable
    https://my.cytron.io/p-usb-micro-b-cable

  Libraries required from bundle (https://circuitpython.org/libraries):
  - adafruit_espatcontrol
  - adafruit_max7219
  - adafruit_framebuf.mpy
  - adafruit_requests.mpy
  - simpleio.mpy
  - font5x8.bin (in examples folder)

  References:
  - https://tutorial.cytron.io/2019/10/23/dot-matrix-clock-with-ntp-server-using-esp32/

  Last update: 3 Jan 2022
"""

import time
import busio
import digitalio
import simpleio
from board import *
from adafruit_max7219 import matrices

import adafruit_requests as requests
import adafruit_espatcontrol.adafruit_espatcontrol_socket as socket
from adafruit_espatcontrol import adafruit_espatcontrol
import json

# Get wifi details and more from a secrets.py file
try:
    from secrets import secrets
except ImportError:
    print("All secret keys are kept in secrets.py, please add them there!")
    raise

TIME_API = "http://worldtimeapi.org/api/ip"

led = digitalio.DigitalInOut(LED)
led.direction = digitalio.Direction.OUTPUT

BUZZER = GP18

# Initialize UART connection to the ESP8266 WiFi Module.
RX = GP17
TX = GP16
uart = busio.UART(TX, RX, receiver_buffer_size=2048)  # Use large buffer as we're not using hardware flow control.

esp = adafruit_espatcontrol.ESP_ATcontrol(uart, 115200, debug=False)
requests.set_socket(socket, esp)

print("Resetting ESP module")
esp.soft_reset()

mosi = GP7
clk = GP6
cs = digitalio.DigitalInOut(GP5)
spi = busio.SPI(clk, MOSI=mosi)

display = matrices.CustomMatrix(spi, cs, 32, 8)

day = ["Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"]

NOTE_C4 = 261
NOTE_F4 = 349
NOTE_G4 = 392
NOTE_A4 = 440

notes_hour = [
    NOTE_A4, NOTE_F4, NOTE_G4, NOTE_C4, 0, NOTE_C4, NOTE_G4, NOTE_A4, NOTE_F4
]
noteduration_hour = [
    2, 2, 2, 2, 2, 2, 2, 2, 2
]

def play_melody(notes, duration):
    for i in range(len(notes)):
        simpleio.tone(BUZZER, notes[i], 1/duration[i])

def display_colon():
    display.pixel(15, 2, 1)
    display.pixel(16, 2, 1)
    display.pixel(15, 3, 1)
    display.pixel(16, 3, 1)

    display.pixel(15, 5, 1)
    display.pixel(16, 5, 1)
    display.pixel(15, 6, 1)
    display.pixel(16, 6, 1)

display.clear_all()

prev_seconds = None
prev_minutes = None
am_pm = ""
time_offset = 0
request_time = False
display_date = False
internet = True

while not esp.is_connected:
    try:
        print("Connecting...")
        esp.connect(secrets)

    except (ValueError, RuntimeError, adafruit_espatcontrol.OKError) as e:
        print("Failed, retrying\n", e)

while True:
    if not request_time:
        try:
            led.value = True
            response = requests.get(TIME_API)
            json = response.json()
            time_offset = json["unixtime"] + json["raw_offset"] - time.time()
            led.value = False
            request_time = True

        except:
            continue

    current_time = time.time() + time_offset
    now = time.localtime(current_time)

    seconds = now.tm_sec

    if seconds != prev_seconds:
        prev_seconds = seconds

        year = now.tm_year
        month = now.tm_mon
        mday = now.tm_mday
        hours = now.tm_hour
        minutes = now.tm_min
        days = day[now.tm_wday]

        if hours > 12:
            hours = hours - 12
            am_pm = "PM"
        else:
            am_pm = "AM"

        print("{}, {}/{}/{} {}:{:02}:{:02} {}".format(days, mday, month, year, hours, minutes, seconds, am_pm))

        if (minutes % 10 == 0 or minutes == 0) and display_date == False:
            display_date = True
            prev_minutes = minutes

            day_date = "{} {} {:02}/{:02}".format(days, year, mday, month)
            # scroll a string across the display
            for pixel_position in range((len(day_date)-5)*6+32):
                display.fill(0)
                display.text(day_date, -pixel_position+32, 0)
                display.show()
                time.sleep(0.1)

            if minutes == 0:
                play_melody(notes_hour, noteduration_hour)
            else:
                time.sleep(5)

            if not esp.is_connected:
                for i in range(3):
                    try:
                        print("Connecting...")
                        esp.connect(secrets)
                        request_time = False
                        internet = True
                        break

                    except (ValueError, RuntimeError, adafruit_espatcontrol.OKError) as e:
                        print("Failed, retrying\n", e)
                        internet = False

        else:
            display.fill(0)
            display.text("{:02}".format(hours), 3, 0)
            display.text("{:02}".format(minutes), 18, 0)
            if seconds % 2 or internet == False:
                display_colon()
            display.show()

            if minutes != prev_minutes and display_date:
                display_date = False

secrets.py

# Secret Keys.

secrets = {
    "ssid"                     : "my_wifi_ssid",
    "password"                 : "my_wifi_password"
}