X-Git-Url: https://zdv2.bktei.com/gitweb/EVA-2020-02-2.git/blobdiff_plain/d7b32dab72e651460c2a419405443d916c14d2f8..391bec805e2503f517fbec5d864f4d353e5f00ab:/examples/all-in-one.py?ds=inline

diff --git a/examples/all-in-one.py b/examples/all-in-one.py
index 0ec440b..413b099 100755
--- a/examples/all-in-one.py
+++ b/examples/all-in-one.py
@@ -10,6 +10,7 @@ import ltr559
 from bme280 import BME280
 from pms5003 import PMS5003
 from enviroplus import gas
+from subprocess import PIPE, Popen
 from PIL import Image
 from PIL import ImageDraw
 from PIL import ImageFont
@@ -53,12 +54,14 @@ 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]]
+    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)
@@ -66,16 +69,32 @@ def display_text(variable, data, unit):
     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)]
+        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
+        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
@@ -113,7 +132,12 @@ try:
         if mode == 0:
             variable = "temperature"
             unit = "C"
-            data = bme280.get_temperature()
+            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: