Added a new combined mode example

examples/combined.py

@@ -0,0 +1,345 @@
+#!/usr/bin/env python
+
+import time
+import colorsys
+import os
+import sys
+import ST7735
+try:
+    # Transitional fix for breaking change in LTR559
+    from ltr559 import LTR559
+    ltr559 = LTR559()
+except ImportError:
+    import ltr559
+
+from bme280 import BME280
+from pms5003 import PMS5003, ReadTimeoutError as pmsReadTimeoutError
+from enviroplus import gas
+from subprocess import PIPE, Popen
+from PIL import Image
+from PIL import ImageDraw
+from PIL import ImageFont
+import logging
+
+logging.basicConfig(
+    format='%(asctime)s.%(msecs)03d %(levelname)-8s %(message)s',
+    level=logging.INFO,
+    datefmt='%Y-%m-%d %H:%M:%S')
+
+logging.info("""all-in-one.py - Displays readings from all of Enviro plus' sensors
+
+Press Ctrl+C to exit!
+
+""")
+
+# BME280 temperature/pressure/humidity sensor
+bme280 = BME280()
+
+# PMS5003 particulate sensor
+pms5003 = PMS5003()
+
+# 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)
+smallfont = ImageFont.truetype(path + "/fonts/Asap/Asap-Bold.ttf", 10)
+x_offset = 2
+y_offset = 2
+
+message = ""
+
+# The position of the top bar
+top_pos = 25
+
+# Create a values dict to store the data
+variables = ["temperature",
+             "pressure",
+             "humidity",
+             "light",
+             "oxidised",
+             "reduced",
+             "nh3",
+             "pm1",
+             "pm25",
+             "pm10"]
+
+units = ["C",
+         "hPa",
+         "%",
+         "Lux",
+         "kO",
+         "kO",
+         "kO",
+         "ug/m3",
+         "ug/m3",
+         "ug/m3"]
+
+# Define your own warning limits
+# The limits definition follows the order of the variables array
+# Example limits explanation for temperature:
+# [4,18,28,35] means
+# [-273.15 .. 4] -> Dangerously Low
+# (4 .. 18]      -> Low
+# (18 .. 28]     -> Normal
+# (28 .. 35]     -> High
+# (35 .. MAX]    -> Dangerously High
+# DISCLAIMER: The limits provided here are just examples and come
+# with NO WARRANTY. The authors of this example code claim
+# NO RESPONSIBILITY if reliance on the following values or this
+# code in general leads to ANY DAMAGES or DEATH.
+limits = [[4,18,28,35],
+          [250,650,1013.25,1015],
+          [20,30,60,70],
+          [-1,-1,30000,100000],
+          [-1,-1,40,50],
+          [-1,-1,450,550],
+          [-1,-1,200,300],
+          [-1,-1,50,100],
+          [-1,-1,50,100],
+          [-1,-1,50,100]]
+
+# RGB palette for values on the combined screen
+palette = [(0,0,255),           # Dangerously Low
+           (0,255,255),         # Low
+           (0,255,0),           # Normal
+           (255,255,0),         # High
+           (255,0,0)]           # Dangerously High
+
+values = {}
+
+
+# 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)
+    logging.info(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)
+
+# Saves the data to be used in the graphs later and prints to the log
+def save_data(idx, data):
+    variable = variables[idx]
+    # Maintain length of list
+    values[variable] = values[variable][1:] + [data]
+    unit = units[idx]
+    message = "{}: {:.1f} {}".format(variable[:4], data, unit)
+    logging.info(message)
+
+
+# Displays all the text on the 0.96" LCD
+def display_everything():
+    draw.rectangle((0, 0, WIDTH, HEIGHT), (0, 0, 0))
+    column_count = 2
+    row_count = (len(variables)/column_count)
+    for i in xrange(len(variables)):
+        variable = variables[i]
+        data_value = values[variable][-1]
+        unit = units[i]
+        x = x_offset + ((WIDTH/column_count) * (i / row_count))
+        y = y_offset + ((HEIGHT/row_count) * (i % row_count))
+        message = "{}: {:.1f} {}".format(variable[:4], data_value, unit)
+        lim = limits[i]
+        rgb = palette[0]
+        for j in xrange(len(lim)):
+            if data_value > lim[j]:
+                rgb = palette[j+1]
+        draw.text((x, y), message, font=smallfont, fill=rgb)
+    st7735.display(img)
+
+
+
+# Get the temperature of the CPU for compensation
+def get_cpu_temperature():
+    process = Popen(['vcgencmd', 'measure_temp'], stdout=PIPE, universal_newlines=True)
+    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 = 1.95
+
+cpu_temps = [get_cpu_temperature()] * 5
+
+delay = 0.5  # Debounce the proximity tap
+mode = 10    # The starting mode
+last_page = 0
+light = 1
+
+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)+1)
+            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(variables[mode], data, unit)
+
+        if mode == 1:
+            # variable = "pressure"
+            unit = "hPa"
+            data = bme280.get_pressure()
+            display_text(variables[mode], data, unit)
+
+        if mode == 2:
+            # variable = "humidity"
+            unit = "%"
+            data = bme280.get_humidity()
+            display_text(variables[mode], data, unit)
+
+        if mode == 3:
+            # variable = "light"
+            unit = "Lux"
+            if proximity < 10:
+                data = ltr559.get_lux()
+            else:
+                data = 1
+            display_text(variables[mode], data, unit)
+
+        if mode == 4:
+            # variable = "oxidised"
+            unit = "kO"
+            data = gas.read_all()
+            data = data.oxidising / 1000
+            display_text(variables[mode], data, unit)
+
+        if mode == 5:
+            # variable = "reduced"
+            unit = "kO"
+            data = gas.read_all()
+            data = data.reducing / 1000
+            display_text(variables[mode], data, unit)
+
+        if mode == 6:
+            # variable = "nh3"
+            unit = "kO"
+            data = gas.read_all()
+            data = data.nh3 / 1000
+            display_text(variables[mode], data, unit)
+
+        if mode == 7:
+            # variable = "pm1"
+            unit = "ug/m3"
+            try:
+                data = pms5003.read()
+            except pmsReadTimeoutError:
+                logging.warn("Failed to read PMS5003")
+            else:
+                data = float(data.pm_ug_per_m3(1.0))
+                display_text(variables[mode], data, unit)
+
+        if mode == 8:
+            # variable = "pm25"
+            unit = "ug/m3"
+            try:
+                data = pms5003.read()
+            except pmsReadTimeoutError:
+                logging.warn("Failed to read PMS5003")
+            else:
+                data = float(data.pm_ug_per_m3(2.5))
+                display_text(variables[mode], data, unit)
+
+        if mode == 9:
+            # variable = "pm10"
+            unit = "ug/m3"
+            try:
+                data = pms5003.read()
+            except pmsReadTimeoutError:
+                logging.warn("Failed to read PMS5003")
+            else:
+                data = float(data.pm_ug_per_m3(10))
+                display_text(variables[mode], data, unit)
+        if mode == 10:
+            # Everything on one screen
+            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()
+            raw_data = raw_temp - ((avg_cpu_temp - raw_temp) / factor)
+            save_data(0, raw_data)
+            display_everything()
+            raw_data = bme280.get_pressure()
+            save_data(1, raw_data)
+            display_everything()
+            raw_data = bme280.get_humidity()
+            save_data(2, raw_data)
+            if proximity < 10:
+                raw_data = ltr559.get_lux()
+            else:
+                raw_data = 1
+            save_data(3, raw_data)
+            display_everything()
+            gas_data = gas.read_all()
+            save_data(4, gas_data.oxidising / 1000)
+            save_data(5, gas_data.reducing / 1000)
+            save_data(6, gas_data.nh3 / 1000)
+            display_everything()
+            pms_data = None
+            try:
+                pms_data = pms5003.read()
+            except pmsReadTimeoutError:
+                logging.warn("Failed to read PMS5003")
+            else:
+                save_data(7, float(pms_data.pm_ug_per_m3(1.0)))
+                save_data(8, float(pms_data.pm_ug_per_m3(2.5)))
+                save_data(9, float(pms_data.pm_ug_per_m3(10)))
+                display_everything()
+
+
+
+# Exit cleanly
+except KeyboardInterrupt:
+    sys.exit(0)