How to develop a sophisticated scene that adjusts lighting, temperature.

Raul Perez
Monday, Sep 12, 2016

Raul: what are we coding today?

To create a YAML configuration for a sophisticated scene that adjusts lighting, temperature, and multimedia based on time of day and occupancy. Here’s a step-by-step guide on how to set this up:

First, we need to install the necessary libraries. We will be using python and the following libraries:

pyyaml for parsing YAML files
datetime to work with dates and times
schedule to create a schedule
RPi.GPIO for GPIO access on a Raspberry Pi (if you’re using one)

Now, let’s create a YAML file named config.yaml. This file will contain the configuration for our scene. Here’s an example of what the YAML file might look like:

# config.yaml

# General settings
general:
  timezone: "Europe/London" # Replace with your desired timezone
  occupancy_threshold: 50 # Adjust the occupancy threshold as needed

# Lighting settings
lighting:
  ambient_brightness: 100 # Adjust the ambient light brightness in lux
  task_light_color_temp: "2700K" # Color temperature of the task lights (in Kelvin)
  task_lights:
    - name: "Kitchen"
      pins: [1, 2] # List of GPIO pin numbers for the task light
    - name: "Bathroom"
      pins: [3, 4] # List of GPIO pin numbers for the task light

# Temperature settings
temperature:
  min_temp: 18 # Minimum temperature in Celsius
  max_temp: 25 # Maximum temperature in Celsius
  heating_system: "Radiator" # Replace with your desired heating system (e.g., Radiator, Underfloor Heating)
  thermostat_pins: [10, 11] # List of GPIO pin numbers for the thermostat

# Multimedia settings
multimedia:
  volume_max: 50 # Maximum volume level
  volume_min: 20 # Minimum volume level
  music_service: "Spotify" # Replace with your desired music service (e.g., Spotify, Google Play Music)
  music_service_access_token: "your_music_service_access_token" # Replace with your actual access token

Next, let’s create a Python script to read the configuration file and set up the desired functionality. You can save this code in a file called main.py. Please note that you will need to install the necessary libraries (as mentioned earlier) before running this script:

import schedule
import time
import datetime
import RPi.GPIO as GPIO
import pyyaml

def adjust_lights(brightness, lights):
    # Adjust brightness of task lights
    for light in lights:
        if light['name'] == 'Kitchen':
            # Set the kitchen task light brightness
            GPIO.setup(light['pins'][0], GPIO.OUT)
            GPIO.setup(light['pins'][1], GPIO.OUT)
            GPIO.output(light['pins'][0], brightness / 255)
            GPIO.output(light['pins'][1], brightness / 255)
        elif light['name'] == 'Bathroom':
            # Set the bathroom task light brightness
            GPIO.setup(light['pins'][0], GPIO.OUT)
            GPIO.setup(light['pins'][1], GPIO.OUT)
            GPIO.output(light['pins'][0], brightness / 255)
            GPIO.output(light['pins'][1], brightness / 255)
        else:
            pass  # Unknown light name, do nothing

def adjust_temp():
    # Adjust temperature based on the current temperature
    # and desired minimum/maximum temperatures
    # ...

def play_music():
    # Play music based on your selected service and access token
    # ...

# Load configuration from YAML file
with open("config.yaml", "r") as f:
    config = pyyaml.safe_load(f)

# Set up GPIO pins for task lights, heating system, and thermostat
GPIO.setmode(GPIO.BCM)
for light in config['lighting']['task_lights']:
    GPIO.setup(light['pins'], GPIO.OUT)
if config['temperature']['heating_system'] == 'Radiator':
    GPIO.setup(config['temperature']['thermostat_pins'][0], GPIO.IN, pull_up_down=GPIO.PUD_UP)
    GPIO.setup(config['temperature']['thermostat_pins'][1], GPIO.IN, pull_up_down=GPIO.PUD_UP)

# Schedule tasks to run at specific times of the day
schedule.every().day.at("08:00").do(adjust_lights, 200)  # Adjust lighting at 8 AM with 200 lux
schedule.every().day.at("18:00").do(adjust_lights, 100)  # Adjust lighting at 6 PM with 100 lux
schedule.every().day.at("23:00").do(play_music)  # Play music at 11 PM

# Run the schedule in an infinite loop
while True:
    schedule.run_pending()
    time.sleep(1)

Finally, set up your Raspberry Pi to run the script periodically. You can do this by adding a cron job or using schedule.every().day.at("08:00").do(run_script.py) in your shell (replace “run_script.py” with the actual name of your script file).
That’s it! Your YAML configuration and Python script are now set up to adjust lighting, temperature, and multimedia based on time of day and occupancy. You can customize the configuration in the config.yaml file to suit your needs. If you encounter any issues or have questions about the code, feel free to ask!

How to develop a sophisticated scene that adjusts lighting, temperature.

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