fujexo / sensor-network

Small setup of a little sensor network using Grafana, MQTT, InfluxDB and some ESP8266 with DHT22 sensors

Code is WIP!!!

Please see the Wiki for more information

Hardware setup

Wire the DHT22

10kOhm Resistor from VCC to DATA DATA Pin to Pin D4 on a NodeMCU board

   _ _ __ _ _
  |          |
  |  DHT 22  |
  |          |
  ||--|--|--||

VCC DATA NC GND

Flash the code to the sensors

Choose the correct board in platform.ini. Examples are "nodemcu" or "d1_mini". Edit the settings in src/config.h (example in src/config.h.example). Each sensor has to have a distinguished name which has to match in the Grafana .json). Flash the code to the board with the "PlatformIO: Upload" button in the gui or do it via cli with:

platformio run -t upload

Code setup

Create and edit your configuration

• Clone this repo to /etc/docker/compose/sensor-network
• cd /etc/docker/compose/sensor-network
• cp .env.example .env
• Edit .end to fit your needs

Ports to open if you use a firewall

• 3000 (Grafana - show graphs) HTTP
• 1883 (Mosquitto - incoming data) MQTT

Configure Grafana

Login to grafana and the template examples/dht22.jason

Add data source in Grafana (after logging in with the credentials in .env)

Name: DS_SENSORS (has to match the .jason datasource) Type: InfluxDB URL: http://influxdb:8086 Access: proxy Database: same as INFLUX_DABA in .env User: same as INFLUX_USER in .env Password: same as INFLUX_PASS in .env

Tips and Tricks

Systemd

Based on https://gist.github.com/mosquito/b23e1c1e5723a7fd9e6568e5cf91180f

• ln -s examples/docker-compose.service /etc/systemd/system/[email protected]
• systemctl daemon-reload
• systemctl enable docker-compose@sensor-network
• systemctl start docker-compose@sensor-network

sensor-network's Issues

Docker-Deployment

Add the salt-state and maybe a docker-compose file to the repo

Problem with ArduinoJSON - Converting float to int

If a float contains a flat value, for exampel "25.0", the ArduinoJSON library somehow converts it to an int which can't be sent to influxdb afterwards.

Sensor stops working - No more Data

Sometimes, the sensors stop working.

This issue should be removed when Deep Sleep is implemented, as the ESP will reboot after the sleep cycle

Grafana Dashboard

Create a templated Grafana dashboard and add the json to GitHub