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LEDBorg - Examples - How Hot is My Pi

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We want to know how hot our Raspberry Pis are getting when they do their thing, and what better way then with LEDs?
This is an updated version of the old BakedPi script which uses the new driver free LedBorg code.
As a side benefit the extended colour range allows us to see what the temperature is like more clearly over larger ranges.

The colour displayed starts at minimum temperature represented by blue, 50% by green, and maximum temperature by red:


You can download the code directly to your Raspberry Pi using:
cd ~/ledborg
wget -O HowHotIsMy.py https://piborg.org/downloads/HowHotIsMy.py.txt
Or save the text file from the link on your Raspberry Pi as HowHotIsMy.py

Make the script executable using
chmod +x HowHotIsMy.py
and run using
sudo ./HowHotIsMy.py

 

#!/usr/bin/env python
# coding: latin-1

# Import library functions we need
import time
import wiringpi2 as wiringpi
wiringpi.wiringPiSetup()

# Setup software PWMs on the GPIO pins
PIN_RED = 0
PIN_GREEN = 2
PIN_BLUE = 3
LED_MAX = 100
wiringpi.softPwmCreate(PIN_RED,   0, LED_MAX)
wiringpi.softPwmCreate(PIN_GREEN, 0, LED_MAX)
wiringpi.softPwmCreate(PIN_BLUE,  0, LED_MAX)
wiringpi.softPwmWrite(PIN_RED,   0)
wiringpi.softPwmWrite(PIN_GREEN, 0)
wiringpi.softPwmWrite(PIN_BLUE,  0)

# A function to set the LedBorg colours
def SetLedBorg(red, green, blue):
    wiringpi.softPwmWrite(PIN_RED,   int(red   * LED_MAX))
    wiringpi.softPwmWrite(PIN_GREEN, int(green * LED_MAX))
    wiringpi.softPwmWrite(PIN_BLUE,  int(blue  * LED_MAX))

# A function to turn the LedBorg off
def LedBorgOff():
    SetLedBorg(0, 0, 0)

# Setup for processor monitor
pathSensor = '/sys/class/thermal/thermal_zone0/temp'    # File path used to read the temperature
readingPrintMultiplier = 0.001                          # Value to multiply the reading by for user display
tempHigh = 60000                                        # Highest scale reading
tempLow = 30000                                         # Lowest scale reading
interval = 1                                            # Time between readings in seconds

try:
    # Make sure we are using floats
    tempHigh = float(tempHigh)
    tempLow = float(tempLow)
    while True:
        # Read the temperature in from the file system
        fSensor = open(pathSensor, 'r')
        reading = float(fSensor.read())
        fSensor.close()
        # Pick the relevant colour
        position = (reading - tempLow) / (tempHigh - tempLow)
        if position < 0.0:
            # Below 0%, use blue
            red   = 0.0
            green = 0.0
            blue  = 1.0
        elif position <= 0.5:
            # Between 0% and 50%, slide between blue and green
            red   = 0.0
            green = position * 2.0
            blue  = 1.0 - green
        elif position <= 1.0:
            # Between 50% and 100%, slide between green and red
            red   = (position - 0.5) * 2.0
            green = 1.0 - red
            blue  = 0.0
        else:
            # Above 100%, use red
            red   = 1.0
            green = 0.0
            blue  = 0.0
        # Set the relevant colour
        SetLedBorg(red, green, blue)
        # Print the latest reading
        print '%02.3f' % (reading * readingPrintMultiplier)
        # Wait a while
        time.sleep(interval)
except KeyboardInterrupt:
    # CTRL+C exit, turn off the LedBorg
    print 'Terminated'
    LedBorgOff()
Last update: Oct 27, 2017

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