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

Example crontab entry

# Read every 30 minutes
*/30 * * * * sudo python3 ~/scripts/dht/main.py >> /var/log/dht.log 2>&1