DHT22 Temperature and Humidity Sensor

Read temperature and humidity data from a DHT22 sensor connected to a Raspberry Pi or other Blinka-supported boards. See a list of supported boards here.

Deployment

# SSH into machine
ssh <username>@<ip_address>

# Clone and install
cd ~
git clone https://github.com/Javis-Industries/temp-sensor
cd temp-sensor
./install.sh

# Edit config for this location
nano ~/temp-sensor/config.ini
# Change: location = server_room_floor_1

# Start service
sudo systemctl enable temp-sensor
sudo systemctl start temp-sensor

# Verify
curl http://localhost:9100/metrics

Prometheus Configuration

This project exposes metrics on port 9100 by default. Below is an example job configuration for Prometheus to scrape these metrics.

scrape_configs:
  - job_name: "temperature-sensors"
    static_configs:
      - targets:
          - "hostname:9100" # Replace with your device's IP or hostname
    scrape_interval: 30s```

Pin Configuration

Which pins to plug the DHT22 sensor into.

Board	Pins
Raspberry Pi 4	6, 4, 1

Example Queries

Query	Description
temp_f{location="server_room"}	Current temperature
humidity_pct{location="server_room"}	Current humidity
avg_over_time(temp_f[1h])	Avg temp over last hour
sensor_read_errors_total	Total read errors