DHT11 Temperature & Humidity Sensor
Read temperature and humidity from a DHT11 sensor.
Hardware Setup
Wiring (adjust pin as needed):
DHT11 Pinout:
─────────────
1. VCC → 5V (Pin 2 oder 4)
2. DATA → GPIO <PIN> + 10K Pull-Up Widerstand → 5V
3. GND → GND (Pin 6)
Important: The 10K pull-up resistor must be connected between DATA and VCC (5V)!
Installation
# Install dependencies
pip3 install RPi.GPIO
Usage
Read Sensor (default pin 19)
sudo python3 scripts/dht/main.py
Read Sensor (custom pin)
sudo python3 scripts/dht/main.py 4 # Uses GPIO 4
Using Environment Variable
export DHT_PIN=4
sudo python3 scripts/dht/main.py
Output
- Line 1: Temperature (°C)
- Line 2: Humidity (%)
Customization
| Variable | Default | Description |
|---|---|---|
| DHT_PIN | 19 | GPIO pin number |
Example crontab entry
# Read every 30 minutes
*/30 * * * * sudo python3 ~/scripts/dht/main.py >> /var/log/dht.log 2>&1