RackTOR

This project uses some DS18S20 digital temperature sensors to get temperature data.

Data

The data between the Arduino and RasPI flows like this:

1. Arduino reads sensors every second, and displays temperature on the LCD.
2. Python scripts sends out control sequence c7 to get data from Arduino.
3. Arduino sends it's custom ID, sensorPin, device, temperature each on a separate line.

Type	Descirption
ID	Is a 4 digit code. For I2C interface can be between 1000-1127.
SensorPin	Is the pin where the OneWire reads data. Could be any of the digitalIOs.
Device	Number of the device on the OneWire interface. 0-127.
Temperature	Float value. Usually 2 decimal places. range could be -25 - +125.

There's a cronjob running on the system, which pulls data from devices every 5 minutes. It could be set to almost any value.

The python script automatically reads data from Arduino, and should convert it to JSON-format. JSON is needed to pass data to InfluxDB by the influxdb-python module. Then Grafana reads its data from InfluxDB.

Grafana

sudo systemctl daemon-reload
sudo systemctl start grafana-server
sudo systemctl status grafana-server

• Binaries /usr/sbin/grafana-server
• Init.d /etc/init.d/grafana-server
• ENV vars /etc/default/grafana-server
• CONF /etc/grafana/grafana.ini
• Systemd grafana-server.service
• LOG /var/log/grafana/grafana.db
• DB /var/lib/grafana/grafana.db
• HTML/JS/CSS /usr/share/grafana

Default port is 3000, default user admin and password admin.

Changed password to racktor.

Backup and restore

InfluxDB is backed up by influxd backup -database racktor </somewhere>.

To restore,

• Stop InfluxDB, systemctl stop influxdb.service
• Untar backup, tar xvf racktor_db.tar.gz
• Import metadata, influxd restore -metadir /var/lib/influxdb/meta .
• Import data, influxd restore -database racktor /var/lib/influxdb/data .
• Start service, ssystemctl start influxdb.service.