Merge pull request #75 from tijmenvandenbrink/master

[EVA-2020-02-2.git] / examples / compensated-temperature.py

diff --git a/examples/compensated-temperature.py b/examples/compensated-temperature.py
index 367961003a6cd90afdcd0251f3e6d04e4ff90887..b648f57608a02c5a8a523b90a88884d545dac979 100755 (executable)
--- a/examples/compensated-temperature.py
+++ b/examples/compensated-temperature.py
@@ -1,15 +1,21 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3

 
 import time
 from bme280 import BME280
 
 import time
 from bme280 import BME280

-from subprocess import PIPE, Popen

 
 try:
     from smbus2 import SMBus
 except ImportError:
     from smbus import SMBus
 
 
 try:
     from smbus2 import SMBus
 except ImportError:
     from smbus import SMBus
 

-print("""compensated-temperature.py - Use the CPU temperature
+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("""compensated-temperature.py - Use the CPU temperature

 to compensate temperature readings from the BME280 sensor.
 Method adapted from Initial State's Enviro pHAT review:
 https://medium.com/@InitialState/tutorial-review-enviro-phat-for-raspberry-pi-4cd6d8c63441
 to compensate temperature readings from the BME280 sensor.
 Method adapted from Initial State's Enviro pHAT review:
 https://medium.com/@InitialState/tutorial-review-enviro-phat-for-raspberry-pi-4cd6d8c63441


@@ -24,16 +30,17 @@ bme280 = BME280(i2c_dev=bus)
 
 # Get the temperature of the CPU for compensation
 def get_cpu_temperature():
 
 # 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("'")])
+    with open("/sys/class/thermal/thermal_zone0/temp", "r") as f:
+        temp = f.read()
+        temp = int(temp) / 1000.0
+    return temp

 
 
 # Tuning factor for compensation. Decrease this number to adjust the
 # temperature down, and increase to adjust up
 
 
 # Tuning factor for compensation. Decrease this number to adjust the
 # temperature down, and increase to adjust up

-factor = 0.8
+factor = 2.25

 
 

-cpu_temps = [0] * 5
+cpu_temps = [get_cpu_temperature()] * 5

 
 while True:
     cpu_temp = get_cpu_temperature()
 
 while True:
     cpu_temp = get_cpu_temperature()


@@ -42,5 +49,5 @@ while True:
     avg_cpu_temp = sum(cpu_temps) / float(len(cpu_temps))
     raw_temp = bme280.get_temperature()
     comp_temp = raw_temp - ((avg_cpu_temp - raw_temp) / factor)
     avg_cpu_temp = sum(cpu_temps) / float(len(cpu_temps))
     raw_temp = bme280.get_temperature()
     comp_temp = raw_temp - ((avg_cpu_temp - raw_temp) / factor)

-    print("Compensated temperature: {:05.2f} *C".format(comp_temp))
+    logging.info("Compensated temperature: {:05.2f} *C".format(comp_temp))

     time.sleep(1.0)
     time.sleep(1.0)