From c96f1398ca698205ad5506fc5cc9886f33dcaec2 Mon Sep 17 00:00:00 2001 From: Tanya Fish Date: Tue, 16 Jul 2019 14:21:11 +0100 Subject: [PATCH] Create all-in-one-no-pm.py Example for all of the sensors built in, omitting the optional particulate matter sensor. --- examples/all-in-one-no-pm.py | 178 +++++++++++++++++++++++++++++++++++ 1 file changed, 178 insertions(+) create mode 100644 examples/all-in-one-no-pm.py diff --git a/examples/all-in-one-no-pm.py b/examples/all-in-one-no-pm.py new file mode 100644 index 0000000..367ebeb --- /dev/null +++ b/examples/all-in-one-no-pm.py @@ -0,0 +1,178 @@ +#!/usr/bin/env python + +import time +import colorsys +import os +import sys +import ST7735 +import ltr559 + +from bme280 import BME280 +from enviroplus import gas +from subprocess import PIPE, Popen +from PIL import Image +from PIL import ImageDraw +from PIL import ImageFont + +print("""all-in-one.py - Displays readings from all of Enviro plus' sensors +Press Ctrl+C to exit! +""") + +# BME280 temperature/pressure/humidity sensor +bme280 = BME280() + +# Create ST7735 LCD display class +st7735 = ST7735.ST7735( + port=0, + cs=1, + dc=9, + backlight=12, + rotation=270, + spi_speed_hz=10000000 +) + +# Initialize display +st7735.begin() + +WIDTH = st7735.width +HEIGHT = st7735.height + +# Set up canvas and font +img = Image.new('RGB', (WIDTH, HEIGHT), color=(0, 0, 0)) +draw = ImageDraw.Draw(img) +path = os.path.dirname(os.path.realpath(__file__)) +font = ImageFont.truetype(path + "/fonts/Asap/Asap-Bold.ttf", 20) + +message = "" + +# The position of the top bar +top_pos = 25 + + +# Displays data and text on the 0.96" LCD +def display_text(variable, data, unit): + # Maintain length of list + values[variable] = values[variable][1:] + [data] + # Scale the values for the variable between 0 and 1 + colours = [(v - min(values[variable]) + 1) / (max(values[variable]) + - min(values[variable]) + 1) for v in values[variable]] + # Format the variable name and value + message = "{}: {:.1f} {}".format(variable[:4], data, unit) + print(message) + draw.rectangle((0, 0, WIDTH, HEIGHT), (255, 255, 255)) + for i in range(len(colours)): + # Convert the values to colours from red to blue + colour = (1.0 - colours[i]) * 0.6 + r, g, b = [int(x * 255.0) for x in colorsys.hsv_to_rgb(colour, + 1.0, 1.0)] + # Draw a 1-pixel wide rectangle of colour + draw.rectangle((i, top_pos, i+1, HEIGHT), (r, g, b)) + # Draw a line graph in black + line_y = HEIGHT - (top_pos + (colours[i] * (HEIGHT - top_pos)))\ + + top_pos + draw.rectangle((i, line_y, i+1, line_y+1), (0, 0, 0)) + # Write the text at the top in black + draw.text((0, 0), message, font=font, fill=(0, 0, 0)) + st7735.display(img) + + +# Get the temperature of the CPU for compensation +def get_cpu_temperature(): + process = Popen(['vcgencmd', 'measure_temp'], stdout=PIPE) + output, _error = process.communicate() + return float(output[output.index('=') + 1:output.rindex("'")]) + + +# Tuning factor for compensation. Decrease this number to adjust the +# temperature down, and increase to adjust up +factor = 0.8 + +cpu_temps = [0] * 5 + +delay = 0.5 # Debounce the proximity tap +mode = 0 # The starting mode +last_page = 0 +light = 1 + +# Create a values dict to store the data +variables = ["temperature", + "pressure", + "humidity", + "light", + "oxidised", + "reduced", + "nh3"] + +values = {} + +for v in variables: + values[v] = [1] * WIDTH + +# The main loop +try: + while True: + proximity = ltr559.get_proximity() + + # If the proximity crosses the threshold, toggle the mode + if proximity > 1500 and time.time() - last_page > delay: + mode += 1 + mode %= len(variables) + last_page = time.time() + + # One mode for each variable + if mode == 0: + variable = "temperature" + unit = "C" + cpu_temp = get_cpu_temperature() + # Smooth out with some averaging to decrease jitter + cpu_temps = cpu_temps[1:] + [cpu_temp] + avg_cpu_temp = sum(cpu_temps) / float(len(cpu_temps)) + raw_temp = bme280.get_temperature() + data = raw_temp - ((avg_cpu_temp - raw_temp) / factor) + display_text(variable, data, unit) + + if mode == 1: + variable = "pressure" + unit = "hPa" + data = bme280.get_pressure() + display_text(variable, data, unit) + + if mode == 2: + variable = "humidity" + unit = "%" + data = bme280.get_humidity() + display_text(variable, data, unit) + + if mode == 3: + variable = "light" + unit = "Lux" + if proximity < 10: + data = ltr559.get_lux() + else: + data = 1 + display_text(variable, data, unit) + + if mode == 4: + variable = "oxidised" + unit = "kO" + data = gas.read_all() + data = data.oxidising / 1000 + display_text(variable, data, unit) + + if mode == 5: + variable = "reduced" + unit = "kO" + data = gas.read_all() + data = data.reducing / 1000 + display_text(variable, data, unit) + + if mode == 6: + variable = "nh3" + unit = "kO" + data = gas.read_all() + data = data.nh3 / 1000 + display_text(variable, data, unit) + +# Exit cleanly +except KeyboardInterrupt: + sys.exit(0) -- 2.30.2