examples/all-in-one.py

   1 #!/usr/bin/env python
   2
   3 import time
   4 import colorsys
   5 import os
   6 import sys
   7 import ST7735
   8 import ltr559
   9
  10 from bme280 import BME280
  11 from pms5003 import PMS5003
  12 from enviroplus import gas
  13 from subprocess import PIPE, Popen
  14 from PIL import Image
  15 from PIL import ImageDraw
  16 from PIL import ImageFont
  17
  18 print("""all-in-one.py - Displays readings from all of Enviro plus' sensors
  19
  20 Press Ctrl+C to exit!
  21
  22 """)
  23
  24 # BME280 temperature/pressure/humidity sensor
  25 bme280 = BME280()
  26
  27 # PMS5003 particulate sensor
  28 pms5003 = PMS5003()
  29
  30 # Create ST7735 LCD display class
  31 st7735 = ST7735.ST7735(
  32     port=0,
  33     cs=1,
  34     dc=9,
  35     backlight=12,
  36     rotation=270,
  37     spi_speed_hz=10000000
  38 )
  39
  40 # Initialize display
  41 st7735.begin()
  42
  43 WIDTH = st7735.width
  44 HEIGHT = st7735.height
  45
  46 # Set up canvas and font
  47 img = Image.new('RGB', (WIDTH, HEIGHT), color=(0, 0, 0))
  48 draw = ImageDraw.Draw(img)
  49 path = os.path.dirname(os.path.realpath(__file__))
  50 font = ImageFont.truetype(path + "/fonts/Asap/Asap-Bold.ttf", 20)
  51
  52 message = ""
  53
  54 # The position of the top bar
  55 top_pos = 25
  56
  57
  58 # Displays data and text on the 0.96" LCD
  59 def display_text(variable, data, unit):
  60     # Maintain length of list
  61     values[variable] = values[variable][1:] + [data]
  62     # Scale the values for the variable between 0 and 1
  63     colours = [(v - min(values[variable]) + 1) / (max(values[variable])
  64                - min(values[variable]) + 1) for v in values[variable]]
  65     # Format the variable name and value
  66     message = "{}: {:.1f} {}".format(variable[:4], data, unit)
  67     print(message)
  68     draw.rectangle((0, 0, WIDTH, HEIGHT), (255, 255, 255))
  69     for i in range(len(colours)):
  70         # Convert the values to colours from red to blue
  71         colour = (1.0 - colours[i]) * 0.6
  72         r, g, b = [int(x * 255.0) for x in colorsys.hsv_to_rgb(colour,
  73                    1.0, 1.0)]
  74         # Draw a 1-pixel wide rectangle of colour
  75         draw.rectangle((i, top_pos, i+1, HEIGHT), (r, g, b))
  76         # Draw a line graph in black
  77         line_y = HEIGHT - (top_pos + (colours[i] * (HEIGHT - top_pos)))\
  78                  + top_pos
  79         draw.rectangle((i, line_y, i+1, line_y+1), (0, 0, 0))
  80     # Write the text at the top in black
  81     draw.text((0, 0), message, font=font, fill=(0, 0, 0))
  82     st7735.display(img)
  83
  84
  85 # Get the temperature of the CPU for compensation
  86 def get_cpu_temperature():
  87     process = Popen(['vcgencmd', 'measure_temp'], stdout=PIPE, universal_newlines=True)
  88     output, _error = process.communicate()
  89     return float(output[output.index('=') + 1:output.rindex("'")])
  90
  91
  92 # Tuning factor for compensation. Decrease this number to adjust the
  93 # temperature down, and increase to adjust up
  94 factor = 0.8
  95
  96 cpu_temps = [get_cpu_temperature()] * 5
  97
  98 delay = 0.5  # Debounce the proximity tap
  99 mode = 0  # The starting mode
 100 last_page = 0
 101 light = 1
 102
 103 # Create a values dict to store the data
 104 variables = ["temperature",
 105              "pressure",
 106              "humidity",
 107              "light",
 108              "oxidised",
 109              "reduced",
 110              "nh3",
 111              "pm1",
 112              "pm25",
 113              "pm10"]
 114
 115 values = {}
 116
 117 for v in variables:
 118     values[v] = [1] * WIDTH
 119
 120 # The main loop
 121 try:
 122     while True:
 123         proximity = ltr559.get_proximity()
 124
 125         # If the proximity crosses the threshold, toggle the mode
 126         if proximity > 1500 and time.time() - last_page > delay:
 127             mode += 1
 128             mode %= len(variables)
 129             last_page = time.time()
 130
 131         # One mode for each variable
 132         if mode == 0:
 133             variable = "temperature"
 134             unit = "C"
 135             cpu_temp = get_cpu_temperature()
 136             # Smooth out with some averaging to decrease jitter
 137             cpu_temps = cpu_temps[1:] + [cpu_temp]
 138             avg_cpu_temp = sum(cpu_temps) / float(len(cpu_temps))
 139             raw_temp = bme280.get_temperature()
 140             data = raw_temp - ((avg_cpu_temp - raw_temp) / factor)
 141             display_text(variable, data, unit)
 142
 143         if mode == 1:
 144             variable = "pressure"
 145             unit = "hPa"
 146             data = bme280.get_pressure()
 147             display_text(variable, data, unit)
 148
 149         if mode == 2:
 150             variable = "humidity"
 151             unit = "%"
 152             data = bme280.get_humidity()
 153             display_text(variable, data, unit)
 154
 155         if mode == 3:
 156             variable = "light"
 157             unit = "Lux"
 158             if proximity < 10:
 159                 data = ltr559.get_lux()
 160             else:
 161                 data = 1
 162             display_text(variable, data, unit)
 163
 164         if mode == 4:
 165             variable = "oxidised"
 166             unit = "kO"
 167             data = gas.read_all()
 168             data = data.oxidising / 1000
 169             display_text(variable, data, unit)
 170
 171         if mode == 5:
 172             variable = "reduced"
 173             unit = "kO"
 174             data = gas.read_all()
 175             data = data.reducing / 1000
 176             display_text(variable, data, unit)
 177
 178         if mode == 6:
 179             variable = "nh3"
 180             unit = "kO"
 181             data = gas.read_all()
 182             data = data.nh3 / 1000
 183             display_text(variable, data, unit)
 184
 185         if mode == 7:
 186             variable = "pm1"
 187             unit = "ug/m3"
 188             data = pms5003.read()
 189             data = data.pm_ug_per_m3(1.0)
 190             display_text(variable, data, unit)
 191
 192         if mode == 8:
 193             variable = "pm25"
 194             unit = "ug/m3"
 195             data = pms5003.read()
 196             data = data.pm_ug_per_m3(2.5)
 197             display_text(variable, data, unit)
 198
 199         if mode == 9:
 200             variable = "pm10"
 201             unit = "ug/m3"
 202             data = pms5003.read()
 203             data = data.pm_ug_per_m3(10)
 204             display_text(variable, data, unit)
 205
 206 # Exit cleanly
 207 except KeyboardInterrupt:
 208     sys.exit(0)