Code for Canairi Clone Project by Andy Warburton

code.py

import time
import board
import adafruit_sgp40
import pwmio
from adafruit_motor import servo
import adafruit_ahtx0
import neopixel

### you may need to customize these ###

# The larger the value, the worse the air quality. 
# 0-100, no need to ventilate, purify 
# 100-200, no need to ventilate, purify 
# 200-400, ventilate, purify 
# 400-500, ventilate, purify intensely 

air_boundry = 150 # sets the point at which we declare "bad quality air"
live_angle = 180 # angle at which the bird is "up"
dead_angle = 0 # angle at which the bird is "down"

i2c = board.I2C()  # uses board.SCL and board.SDA

# This is our SGP40 air quality sensor
sgp = adafruit_sgp40.SGP40(i2c)

# this is our temp/humidity sensor
aht = adafruit_ahtx0.AHTx0(board.I2C())

# setup the onboard neopixel
pixel = neopixel.NeoPixel(board.NEOPIXEL, 1)
pixel.brightness = 0.2
pixel.fill((255, 255, 255))

# create a PWMOut object on Pin A0.
pwm = pwmio.PWMOut(board.A0, duty_cycle=2 ** 15, frequency=50) 

# Create a servo object, my_servo.
bird = servo.Servo(pwm,min_pulse = 500, max_pulse = 2300)

# don't change these unless you know what you're doing
status = "clean"
old_status = status

# default to "dead" until we have a clear reading
bird.angle = live_angle

# sane defaults
temperature = 21
humidity = 50

print("========================")
print(" THE BIRD IS THE WORD")
print("=======================")

while True:

	# getting temp and humidity for more acurate air quality readings
	temperature = aht.temperature
	humidity = aht.relative_humidity

	# return int The VOC index measured, ranged from 0 to 500
	compensated_raw_gas = sgp.measure_raw(temperature = temperature, relative_humidity = humidity)
	raw_gas = sgp.raw

	voc = sgp.measure_index(temperature = temperature, relative_humidity = humidity)

	# it takes a minute or so for the sensor to warm up
	# so we don't do anything until we get a reading
	if(voc > 0):
		
		if(voc >= air_boundry):
			status = "DIRTY"
			pixel.fill((255, 0, 0))
		else:
			status = "CLEAN"
			pixel.fill((0, 255, 0))

		# print for debugging
		print("THE AIR IS", status, "! \t", "Raw Gas: ", raw_gas, " \t VOC: ", voc, " \t Temp:", temperature, " \t Humidity: ", humidity)

		if(status == "DIRTY" and old_status == "CLEAN"):
			# kill the bird
			print("murdering the bird")
			bird.angle = dead_angle
		
		if(status == "CLEAN" and old_status == "DIRTY"):
			# revivive the bird
			print("reviving the bird")
			bird.angle = live_angle		

		# save the status for the next loop so we can conpare
		old_status = status

	else:

		print(".")

	time.sleep(1)