🌡 Oven Temp

Just a simple temperature monitor.

✨ Features

• ⚡ 128x64 OLED display over I2C to display environment data and IP address.
• 🌡 DHT22 temperature sensor to get environment data.
• 📈 Grafana + InfluxDB to log and graph data (😍 📈📉📊).
• 🐳 Also, it uses docker 😏.

📷 Images

🔌 Wiring

Pi Pin	Device	Device Pin
1 (3V3)	SSD1306	VCC
3 (GPIO 2 - SDA)	SSD1306	SDA
5 (GPIO 5 - SCL)	SSD1306	SCL
6 (GND)	SSD1306	GND
7 (GPIO 4 - GPCLK0)	DHT22	OUT
17 (3v3)	DHT22	VCC
9 (GND)	DHT22	GND

🔧 Setup

🥧 General Pi Setup

Setup locales, update default passwords, run updates and such. You know, the general setting up a new Pi stuff.

🚧 Enable I2C and SPI

• Enable I2C and SPI in the "Interfacing" menu of raspi-config.
• Reboot.

🐳 Install Docker

You can install docker and run containers wherever you want, on the Pi, or another host. The code assumes localhost be default for the InfluxDB connection.

Installing docker on a Pi running Rasbpian is easy:

curl -fsSL https://get.docker.io | sudo bash
sudo apt install -y docker-compose # the install script does not include compose :(
sudo usermod -aG docker pi # should take affect after a re-login

🐍 Python Bits

Install dependencies

sudo apt install -y python3-pip libopenjp2-7 libtiff5
sudo pip3 install --no-cache-dir rpi.gpio influxdb adafruit-circuitpython-ssd1306 Pillow Adafruit_DHT python-dotenv

Download the repo

sudo apt install -y git
git clone https://github.com/bmiddha/oven-temp

Copy the systemd service. The service assumes that the repo is cloned in /home/pi, change the service file if repo is located in another location.

sudo cp oven-temp.service /etc/systemd/system # in the oven-temp dir

🔥 Bringing everything together

Start the Grafana and InfluxDB services

docker-compose up -d # in the oven-temp dir

Start and enable service

sudo systemd enable --now oven-temp.service

📈 Dashboard Setup

• Open a browser to http://RASPBERRY_PI_IP:3000/ to access Grafana. Default credentials are admin, admin.

• Add a new datasource for InfluxDB with the host as http://influxdb:8086, access as "Server" and the database, username, password details based on configuration. Might be worthwhile adding a read-only user for Grafana using the INFLUXDB_READ_USER, and INFLUXDB_READ_USER_PASSWORD environment variables.

• Now you can make cool graphs! 📈😎📉