8. Smart Nightlight

Objective

You’re going to build a smart nightlight using an RGB LED. You are to build on top of the last circuit and replace the LED with an RGB LED to change colors when the night light turns on! Pay close attention to the value of darkness and the logic of the if-else statement.

Wiring

Follow the circuit diagram provided to wire the Metro M0 Express.

Note:

• For common anode RGB LED, connect the longest leg to 3.3V (instead of ground).

• For common cathode RGB LED, connect the longest leg to ground.

Coding/Programming

import board

import pulseio

import time

import random

from analogio import AnalogIn

led1 = pulseio.PWMOut(__________)

led2 = pulseio.PWMOut(__________)

led3 = pulseio.PWMOut(__________)

lightLevel = AnalogIn(__________)

isLedOn = False

lastUpdate = 0

darkness = 10000

changeColorTime = 2

while True:

print((lightLevel.value, ))

time.sleep(0.1)

if (lightLevel.value < darkness):

print("Good Night!")

if (not isLedOn):

led1.duty_cycle = random.randint(20, 55000)

led2.duty_cycle = random.randint(20, 55000)

led3.duty_cycle = random.randint(20, 55000)

isLedOn = __________

lastUpdate = time.monotonic()

time.sleep(0.1)

elif (time.monotonic() > lastUpdate + changeColorTime):

led1.duty_cycle = random.randint(20, 55000)

led2.duty_cycle = random.randint(20, 55000)

led3.duty_cycle = random.randint(20, 55000)

isLedOn = __________

lastUpdate = time.monotonic()

time.sleep(0.1)

else:

print("Rise and Shine!")

led1.duty_cycle = 20

led2.duty_cycle = 20

led3.duty_cycle = 20

isLedOn = __________

time.sleep(0.1)