fade.py

"""
 Copyright (c) 2021 Alan Yorinks All rights reserved.

 This program is free software; you can redistribute it and/or
 modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
 Version 3 as published by the Free Software Foundation; either
 or (at your option) any later version.
 This library is distributed in the hope that it will be useful,f
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 General Public License for more details.

 You should have received a copy of the GNU AFFERO GENERAL PUBLIC LICENSE
 along with this library; if not, write to the Free Software
 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

 DHT support courtesy of Martyn Wheeler
 Based on the DHTNew library - https://github.com/RobTillaart/DHTNew
"""

import sys
import time

from telemetrix_rpi_pico import telemetrix_rpi_pico

"""
Setup a pin for output and fade its intensity
"""

# some globals
# make sure to select a PWM pin
DIGITAL_PIN = 25

# Create a Telemetrix instance.
board = telemetrix_rpi_pico.TelemetrixRpiPico()

# Set the DIGITAL_PIN as an output pin
board.set_pin_mode_pwm_output(DIGITAL_PIN)

# When hitting control-c to end the program
# in this loop, we are likely to get a KeyboardInterrupt
# exception. Catch the exception and exit gracefully.

try:
    # use raw values for a fade
    for level in range(0, 19999, 10):
        board.pwm_write(DIGITAL_PIN, level, raw=True)
    # time.sleep(.01)
    for level in range(19999, 0, -10):
        board.pwm_write(DIGITAL_PIN, level, raw=True)
    # time.sleep(.05)

    # use percentages for a fade
    for level in range(0, 99):
        board.pwm_write(DIGITAL_PIN, level)
        time.sleep(.05)
    for level in range(99, 0, -1):
        board.pwm_write(DIGITAL_PIN, level)
        time.sleep(.05)
except KeyboardInterrupt:
    board.shutdown()
    exit(0)

board.shutdown()
exit(0)