Add room temperature monitoring and alarm on Zabbix

This is a creation in Article, where the information may have evolved or changed.

Accessories and Preparation

Raspberry

Pi (Install CENTOS7 system and Zabbix agent)	1
Ds18b20	1

Company self-built engine room, and then air conditioning failure, buckle Our back pot man 500 yuan per person, said very depressed. Enough to eat a lot of big stalls!! The pot man on the back is not satisfied! Because of the company's Zabbix monitoring, there is just a Raspberry Pi (the pot-man's own, has been requisitioned), so think of the temperature into the Zabbix inside. From a treasure bought a DS18B20 board, has been welding resistance and other devices,

Ds18b20

0x01 after several days of waiting, a treasure of the ds18b20 to the next, connected to the Raspberry Pi, wiring as shown:

Wiring diagram

0x02 Modify the boot configuration of the Raspberry Pi, add driver support for DS18B20, otherwise the temperature information cannot be read

echo "dtoverlay=w1-gpio" >> /boot/config.txt

After blue, restart the Raspberry Pi and find the driver information that can be read to Ds18b20

cat /sys/bus/w1/devices/w1_bus_master1/28-0316a281adff/w1_slave 7f 01 4b 46 7f ff 0c 10 ba : crc=ba YES7f 01 4b 46 7f ff 0c 10 ba t=23937

Note: 28-0316A281ADFF is the device number, and each person's device number will be different.
Where t=23937 is the temperature, calculate the actual problem, only need to divide by 1000.

0X03 using code to get the temperature

This is a simple step, and it should be super simple for Linux's small partners. One awk can take care of it.

awk -F= '$0~/t=/{print $2/1000}' /sys/bus/w1/devices/w1_bus_master1/28-0316a281adff/w1_slave24.25

PS: Recently the pot-man in the back of the Golang, so idle bored, with Golang wrote a version

package mainimport (        "fmt"        "io/ioutil"        "strconv"        "strings")func main() {        date, err := ioutil.ReadFile("/sys/bus/w1/devices/28-0316a281adff/w1_slave")        if err != nil {                return        }        tmp := fmt.Sprintf("%s", date)        buffer := strings.Split(tmp, "=")        buffer1 := strings.Split(buffer[2], "\n")        temp, err := strconv.Atoi(buffer1[0])        if err != nil {                fmt.Println(err)        }        fmt.Println(float64(temp) / 1000.0)}

0x03 Access Zabbix

Modify the Zabbix_agentd configuration file, add key and corresponding program path (this back pot with Golang written, so directly compiled into binary)

UserParameter=get_temp,/opt/zabbix_agent/script/get_temp

0x04 Zabbix Server Adding monitoring items, triggers, and graphics

The monitoring items are configured as follows: Information to select floating point numbers

Monitoring items

The triggers are configured as follows:

Trigger

The graphical configuration is as follows: Select the above configured temperature monitoring item in the Monitoring item

Graphics

0x04 Zabbix and Grafana.

Zabbix

Zabbix effect

Grafana

Grafana effect