Monitoring RPi Temp and CPU with Thingspeak

I made the following python script to update CPU Temperature and 5 minute average CPU load of my RPi to Thingspeak:

#!/usr/bin/env python
import subprocess
import httplib, urllib

GetTempCommand = "cat /sys/class/thermal/thermal_zone0/temp"
GetCPUCommand = "cat /proc/loadavg"

GetTempProcess = subprocess.Popen(GetTempCommand.split(), stdout=subprocess.PIPE)
GetTempOutput = GetTempProcess.communicate()[0]
Temp = float(GetTempOutput) / 1000
#print Temp
GetCPUProcess = subprocess.Popen(GetCPUCommand.split(), stdout=subprocess.PIPE)
GetCPUOutput = GetCPUProcess.communicate()[0]
CPU = GetCPUOutput.split()
#print CPU[1]

params = urllib.urlencode({'field1': CPU[1],'field2': Temp, 'key':'######'})     # use your API key generated in the thingspeak channels for the value of 'key'
# temp is the data you will be sending to the thingspeak channel for plotting the graph. You can add more than one channel and plot more graphs
headers = {"Content-typZZe": "application/x-www-form-urlencoded","Accept": "text/plain"}
conn = httplib.HTTPConnection("api.thingspeak.com:80")                
try:
    conn.request("POST", "/update", params, headers)
    response = conn.getresponse()
    data = response.read()
    conn.close()
except:
    print "connection failed"

The script is run every 5 mins using cron ($ crontab -e):

*/5 * * * * python "/home/ubuntu/logging/TempCPUtoThingspeak.py"

I borrowed some script from here and here.

Raspbian on RPi3 for NAS

20161025_134850
Using a Western Digital PiDrive Cable to power the setup.
  • Raspbian comes with default user:pass = pi:raspbian so this needs to be changed
  • I confirmed SSH was installed and working.
  • Following these instructions;
    • I installed ufw
      sudo apt-get install ufw
      sudo ufw allow ssh
      etc..
    • I confirmed NTP configuration.
  • Installed autoupdates, similar to this with different config.
  • Installed postfix, kind of like this.
  • the rest of the steps are basically the same that I used for Ubuntu – except that there isn’t a proper Ubuntu release for RPI3 yet.

Mount and sync a USB drive on RPi Ubuntu with GPIO

Actions:image
  1. So first the USB is plugged in.
  2. It is automounted using a GPIO button press. Flash red if this fails.
  3. Blue light will flash light during rsync cp (copy). If an error occurs show red LED and turn off blue LED.
  4. Send email with results on completion.
  5. Unmount USB and show steady blue LED indication turn off blue LED.

Continue reading “Mount and sync a USB drive on RPi Ubuntu with GPIO”

RPi GPIO: Adding switches and lights

Goal:

Create a pair of LED’s and push buttons on my RPi which can run scripts. ?One will shut down the Pi (updated here), the other will rsync a directory to a USB. Also I will read the status of a UPS. This may/will become more complicated since the UPS doesn’t have any useful interface (requiring an Arduino to:

  • Watch the UPS battery voltage and tell the RPi to power down.
  • Monitor whether mains power is applied.
  • Once mains is re-powered, restart the RPi after a UPS shut down using the hardware reset pins on the Pi.)
Instructions:
  1. As in these RPi ubuntu instructions I installed python.. I removed sudo from the last command to make the command output happy
sudo apt-get update
sudo apt-get upgrade
sudo apt-get install python-pip
pip install RPi.GPIO
  1. Initially I set up a breadboard as in this youtube video (using the linked files)
    from time import sleep
    import RPi.GPIO as GPIO
    GPIO.setmode(GPIO.BOARD)
    GPIO.setup(12, GPIO.OUT)
    while 1:
     GPIO.output(12, False)
     sleep(1)
     GPIO.output(12, True)
     sleep(1)

    Continue reading “RPi GPIO: Adding switches and lights”