pwm-clock.py

# SPDX-FileCopyrightText: 2020 John Furcean
# SPDX-License-Identifier: MIT

import time, rtc
import board
import feathers2
import ipaddress
import ssl
import wifi
import socketpool
import adafruit_requests
from adafruit_io.adafruit_io import IO_HTTP, AdafruitIO_RequestError

from digitalio import DigitalInOut, Direction, Pull
import pulseio

# OFFSETS for my panel meters so the dial starts at 0
# it takes some tweaking to get them to align just right
# you could also play with their physical orientation as well
HOUR_OFFSET = 700
MIN_OFFSET = 2200
SEC_OFFSET = 500
RTC_CLOCK = rtc.RTC()


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

print("Connecting to %s"%secrets["ssid"])
wifi.radio.connect(secrets["ssid"], secrets["password"])
print("Connected to %s!"%secrets["ssid"])
print("My IP address is", wifi.radio.ipv4_address)

# Test and debug Connection
ipv4 = ipaddress.ip_address("8.8.4.4")
print("Ping google.com: %f ms" % wifi.radio.ping(ipv4))


pool = socketpool.SocketPool(wifi.radio)
requests = adafruit_requests.Session(pool, ssl.create_default_context())
io = IO_HTTP(secrets['aio_username'], secrets['aio_key'], requests)



# initialize the 3v panel meters
analog_hours = pulseio.PWMOut(board.A3, frequency=5000, duty_cycle=0)
analog_minutes = pulseio.PWMOut(board.A4, frequency=5000, duty_cycle=0)
analog_seconds = pulseio.PWMOut(board.A5, frequency=5000, duty_cycle=0)

# set the panel meters to zero (0) based on their offsets
# (this could be different for everyone)
analog_hours.duty_cycle = HOUR_OFFSET
analog_minutes.duty_cycle = MIN_OFFSET
analog_seconds.duty_cycle = SEC_OFFSET

# initialize hours, minutes and seconds to 0
# this forces a sync on the intial loop
hours = 0
minutes = 0
seconds = 0

while True:

    # sync the clock on intitial loop and every 4 hours
    if (hours%4, minutes, seconds) == (0,0,0):

        print("\nSyncing Clock...\n")
        RTC_CLOCK.datetime = io.receive_time()

    hours = (RTC_CLOCK.datetime.tm_hour % 12)
    minutes = RTC_CLOCK.datetime.tm_min
    seconds = RTC_CLOCK.datetime.tm_sec



    print("%02d:%02d:%02d" % (hours, minutes, seconds))

    # calculate the location for each panel meter
    analog_seconds.duty_cycle = int(SEC_OFFSET+seconds*(60500/60))
    analog_minutes.duty_cycle = int(MIN_OFFSET+minutes*(60500/60))
    analog_hours.duty_cycle = int(HOUR_OFFSET+hours*(60500/12))