tracking bugs in complex systems ..

Written by marcelpetrick on March 6, 2018

Some weeks ago I’ve replaced the case of the ‘catcam’. A Raspberry Pi 3 which was running for 1.5 years without interruption with the nice script & python-upload triggered by a cronjob. And now the device freezes. Still running, but neither accessible via SSH nor VNC (of course, if SSH is not working ..).
I left the case open; removed the camera; upgraded kernel and Raspbian: nothing helped.
My last guess is that the camera stopped working. But to be sure I want to let the RPi3 long-time with temperature-logging. So … we need a simple program:

import os
import time

def measure_temp():
        temp = os.popen("vcgencmd measure_temp").readline()
        return (temp.replace("temp=",""))

while True:
        print(time.ctime() + " ## " + measure_temp())
	time.sleep(1)

import os

import time

def measure_temp():

temp = os.popen("vcgencmd measure_temp").readline()

return (temp.replace("temp=",""))

while True:

print(time.ctime() + " ## " + measure_temp())

time.sleep(1)

executed like this, because else the output is buffered up to 4 or 8 kByte:

$ stdbuf -oL python temperature.py > worstLoggingEver.txt

1	$ stdbuf -oL python temperature.py > worstLoggingEver.txt

and the content of the textfile is something like:

Tue Mar  6 22:52:59 2018 ## 51.5'C
Tue Mar  6 22:53:00 2018 ## 52.1'C

1 2	Tue Mar 6 22:52:59 2018 ## 51.5'C Tue Mar 6 22:53:00 2018 ## 52.1'C

solutions; not code

tracking bugs in complex systems ..

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