To use with CircuitPython, you need to first install a few libraries, into the lib folder on your CIRCUITPY drive. Then you need to update code.py with the example script.
Thankfully, we can do this in one go. In the example below, click the Download Project Bundle button below to download the necessary libraries and the code.py file in a zip file. Extract the contents of the zip file, open the directory FunHouse_Fume_Extractor/ and then click on the directory that matches the version of CircuitPython you're using and copy the contents of that directory to your CIRCUITPY drive.
Your CIRCUITPY drive should now look similar to the following image:
# SPDX-FileCopyrightText: 2021 Liz Clark for Adafruit Industries
#
# SPDX-License-Identifier: MIT
import time
import board
import simpleio
import adafruit_sgp30
import displayio
import adafruit_imageload
from adafruit_emc2101 import EMC2101
from adafruit_funhouse import FunHouse
i2c = board.I2C() # uses board.SCL and board.SDA
# i2c = board.STEMMA_I2C() # For using the built-in STEMMA QT connector on a microcontroller
# setup for SGP30 sensor
sgp30 = adafruit_sgp30.Adafruit_SGP30(i2c)
# setup for fan controller
emc = EMC2101(i2c)
print("SGP30 serial #", [hex(i) for i in sgp30.serial])
#SGP30 start-up
sgp30.iaq_init()
sgp30.set_iaq_baseline(0x8973, 0x8AAE)
# FunHouse setup
funhouse = FunHouse(default_bg=0x0F0F00)
# start-up bitmap
bitmap, palette = adafruit_imageload.load("/scene1_fume.bmp",
bitmap=displayio.Bitmap,
palette=displayio.Palette)
tile_grid = displayio.TileGrid(bitmap, pixel_shader=palette)
# connecting bitmap
bitmap2, palette2 = adafruit_imageload.load("/scene2_fume.bmp",
bitmap=displayio.Bitmap,
palette=displayio.Palette)
grid2 = displayio.TileGrid(bitmap2, pixel_shader=palette2)
# default background
bitmap3, palette3 = adafruit_imageload.load("/scene3_fume.bmp",
bitmap=displayio.Bitmap,
palette=displayio.Palette)
grid3 = displayio.TileGrid(bitmap3, pixel_shader=palette3)
# internet connection icon
bitmap4, palette4 = adafruit_imageload.load("/connect_icon.bmp",
bitmap=displayio.Bitmap,
palette=displayio.Palette)
icon1 = displayio.TileGrid(bitmap4, pixel_shader=palette4, x = 2, y = 2)
# red x icon
bitmap5, palette5 = adafruit_imageload.load("/x_icon.bmp",
bitmap=displayio.Bitmap,
palette=displayio.Palette)
icon2 = displayio.TileGrid(bitmap5, pixel_shader=palette5, x = 2, y = 2)
# display group
group = displayio.Group()
# adding start-up bitmap to group
group.append(tile_grid)
funhouse.graphics.root_group.append(group)
# text for fume data
fume_text = funhouse.add_text(
text=" ",
text_position=(110, 90),
text_anchor_point=(0.5, 0.5),
text_color=0xf57f20,
text_font="fonts/Arial-Bold-24.pcf",
)
# text for fan RPM data
fan_text = funhouse.add_text(
text=" ",
text_position=(110, 165),
text_anchor_point=(0.5, 0.5),
text_color=0x7fffff,
text_font="fonts/Arial-Bold-24.pcf",
)
# showing graphics
funhouse.display.root_group = funhouse.graphics.root_group
# state machines
run = False # state if main code is running
connected = False # checks if connected to wifi
start_up = False # state for start-up
clock = 0 # time.monotonic() device
# function for sending fume data to adafruit.io
def send_fume_data(solder_fumes):
funhouse.network.push_to_io("fumes", solder_fumes)
# function for sending fan rpm to adafruit.io
def send_fan_data(fan_rpm):
funhouse.network.push_to_io("fan-speed", fan_rpm)
while True:
# if main program has not started
if not run:
# if you press the down button
if funhouse.peripherals.button_down:
print("run")
# remove start-up bitmap
group.remove(tile_grid)
# add main bitmap
group.append(grid3)
# add red x icon to show not connected to internet
group.append(icon2)
# change state for main program
run = True
# if you press the middle button
if funhouse.peripherals.button_sel:
# remove start-up bitmap
group.remove(tile_grid)
# add connecting... bitmap
group.append(grid2)
# connect to the network
funhouse.network.connect()
print("connecting")
# change state for network
connected = True
# start main program
start_up = True
# start time.monotonic()
clock = time.monotonic()
# after connecting to the internet
if start_up:
# remove connecting bitmap
group.remove(grid2)
# add main bitmap
group.append(grid3)
# add internet icon
group.append(icon1)
# start main program
run = True
# reset start-up state
start_up = False
# run state for main program after selecting whether or not to connect to wifi
if run:
# print eCO2 and TVOC data to REPL
print("eCO2 = %d ppm \t TVOC = %d ppb" % (sgp30.eCO2, sgp30.TVOC))
# 2 second delay
time.sleep(2)
# fumes variable for reading from SGP30
# comment out either TVOC or eCO2 depending on data preference
fumes = sgp30.TVOC
# fumes = sgp30.eCO2
# mapping fumes data to fan RPM
# value for TVOC
mapped_val = simpleio.map_range(fumes, 10, 1000, 10, 100)
# value for eCO2
# mapped_val = simpleio.map_range(fumes, 400, 2500, 10, 100)
# adding fume text
# PPB is for TVOC, PPM is for eCO2
funhouse.set_text("%d PPB" % fumes, fume_text)
# funhouse.set_text("%d PPM" % fumes, fume_text)
# adding fan's RPM text
funhouse.set_text("%d%s" % (mapped_val, "%"), fan_text)
# printing fan's data to the REPL
print("fan = ", mapped_val)
# setting fan's RPM
emc.manual_fan_speed = int(mapped_val)
# if you're connected to wifi and 15 seconds has passed
if connected and ((clock + 15) < time.monotonic()):
# send fume data to adafruit.io
send_fume_data(fumes)
# send fan RPM to adafruit.io
send_fan_data(mapped_val)
# REPL printout
print("data sent")
# reset clock
clock = time.monotonic()
# if you're connected to wifi and you press the up button
if connected and funhouse.peripherals.button_up:
# the internet icon is removed
group.remove(icon1)
# the red x icon is added
group.append(icon2)
# reset connected state - no longer sending data to adafruit.io
connected = False
# REPL printout
print("disconnected")
# 1 second delay
time.sleep(1)
# if you're NOT connected to wifi and you press the up button
if not connected and funhouse.peripherals.button_up:
# the red x icon is removed
group.remove(icon2)
# the internet icon is added
group.append(icon1)
# the connection state is true - start sending data to adafruit.io
connected = True
# REPL printout
print("connected")
# 1 second delay
time.sleep(1)
Page last edited January 22, 2025
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