Skip to main content

Search

Welcome to Mennotech Support

Build Zabbix Temperature Sensor with Orange Pi Armbian

Roland
  • Updated

Requirements

Hardware

  • Orange Pi One
  • Orange Pi One Case
  • 16GB SanDisk Ultra microSDHC Class 10 (or similar)
  • DS18B20 Temperature Sensor
  • PlugableTerminal and cable connector for temperature Sensor (or similar)
  • Optional: PoE Splitter 5V with 4.0mm x 1.7mm Male Adapter (for Orange Pi One)

 

You can find temperature kits by searching for DS18B20 Temperatures Sensor Module Kit

 

Software

Flash Latest version of Armbian to the SD Card

Extract the Armbian Zip file and use balenEtcher to write it to the SD Card

Boot the Orange Pi unit with the flashed SD card

Set root password and configure regular user account and password

Connect to the unit using Putty (or another SSH client)

Run the following commands:

apt update && apt upgrade

Install optional packages

apt install vim-tiny

Set up 1-wire (w1-gpio) and connect sensor

Add the following lines to /boot/armbianEnv.txt

overlays=w1-gpio
param_w1_pin=PD14
param_w1_pin_int_pullup=1

Take note of param_w1_pin, this can be changed to a different pin if need be (see pinout below)

Add the following lines to /etc/modules-load.d/modules.conf

w1-gpio
w1-therm

Wire up the Temp Sensor

Reference: DS18B20 on OrangePi with Armbian | Jake’s Blog (ja-ke.tech)

Connect your temp sensor like the diagram below (or connect to the pin entered in armbianEnv.txt)

orange pi one pinout

PHOTO CREDIT: Jake's Blog (See above)

For the temperature sensors I bought the wires were coloured as follows:

  • YELLOW: Data
  • RED: +5V
  • BLACK: Ground

Testing Temperature Sensor

Run the following command after you have rebooted

# dmesg | grep wire

You should see something link the following if you have connected one sensor correctly

[ 5.615661] Driver for 1-wire Dallas network protocol.
[ 5.625414] gpio-110 (onewire@0): enforced open drain please flag it properly in DT/ACPI DSDT/board file
[ 5.657643] w1_master_driver w1_bus_master1: Attaching one wire slave 28.3c01e076fc86 crc 7e

Take note of the ID for the wire slave (above 28.3c01e076fc86)

Run the following command (using the ID of our unit, note change the period to a hyphen)

 cat /sys/bus/w1/devices/28-3c01e076fc86/w1_slave

You should see something like the following

74 01 55 05 7f a5 81 66 28 : crc=28 YES
74 01 55 05 7f a5 81 66 28 t=23250

The temperature above is detected as 23.250 degrees Celsius

Note: if you want to connect multiple sensors, just add them with each color combined (YELLOW, RED, BLACK). You may want to add one at a time to figure out the unique device ID of each wire.

Configure Zabbix

Install zabbix agent

apt install zabbix-agent

Enable the Zabbix Agent Service

 systemctl enable zabbix-agent.service

Add the following contents to /etc/zabbix/zabbix_agentd.conf.d/temp.conf

ServerActive=zabbix-server.name
Server=zabbix-server.name
Hostname=temp01.local

UserParameter=PiTemp[*],/bin/cat /sys/bus/w1/devices/28-$1/w1_slave | grep 't=' | /usr/bin/awk '{print $$10}' | /bin/sed 's/t=//g'
UserParameter=PiTempDiscover,ls /sys/bus/w1/devices/ | grep 28- | awk 'BEGIN { print "{\"data\":["; FS="-";} {print t "{\"{#PITEMPID}\":\""$2"\"}"} {t=","} END {print "]}"}'

Test from your Zabbix server or proxy server using zabbix_get

# zabbix_get -s 192.168.0.2 -k PiTempDiscover

{"data":[
{"{#PITEMPID}":"01205f8e6ed9"}
,{"{#PITEMPID}":"3c01e076fc86"}
]}

# zabbix_get -s 192.168.0.2 -k PiTemp[3c01e076fc86]

23.312

Recommended minimal hardening Debian Operating System

Set up Unattended Upgrades

Reference: UnattendedUpgrades - Debian Wiki

Install required packages

apt install unattended-upgrades apt-listchanges

The default configuration file for the unattended-upgrades package is at /etc/apt/apt.conf.d/50unattended-upgrades. The defaults will work fine, but you should read it and make changes as needed.

vi /etc/apt/apt.conf.d/50unattended-upgrades

You should at least uncomment the following line:

Unattended-Upgrade::Mail "root";

Set up secure SSH Login

Digital Ocean provides a detailed article on setting up secure SSH login

It is recommended you set a secure root password and save it to a secure password database

# passwd root
New password:
Retype new password:

Set up SSH key based auth for root user

# vi /root/.ssh/authorized_keys

Disable Password based SSH login (either all users, or just for root)

# vi /etc/ssh/sshd_config

#Disable SSH passwords (recommended for highest security)
PasswordAuthentication no

#Only prohibit passwords for root (medium security)
PermitRootLogin prohibit-password

Optional: Delete extra user created during installation

Since the only purpose of logging into this system will be for system management, there is little need for a separate non-root user. Delete the extra user to lower the attack surface.

# deluser firstusername
Removing crontab ...
Removing user `firstusername' ...
Done.

Zabbix Template

Attached is a Zabbix Template that monitors and graphs the temperature sensors.

You can provide custom names for the sensors on the Host Macros. For example:

$PITEMP.MAX is the high temperature alert threshold

$PITEMP.MAX.DELAY is the time that the temperature must be above the level to trigger a warning

$PITEMP.MIN is the low temperature alert threshold

$PITEMP.MIN.DELAY is the time that the temperature must be below the level to trigger a warning

$PITEMP.NAME is the custom sensor name to be displayed in alerts

 

 

Comments

0 comments

Please sign in to leave a comment.

Powered by Zendesk