A simple Raspberry Pi based meteostation with DHT11 & BMP180 sensors and OLED display SSD1306.
$ ./meteostation.py
The OLED will start showing temperature, humidity and barometric pressure. Output on console will be like:
Temp: 24.0 C
Humidity: 60.0 %RH
Temp: 24.7 C
Pressure: 980.2 hPa
Altitude: 279.3 m
...
- First temperature is from DHT11 sensor, the second from BMP180.
- OLED shows the temperature from BMP180.
Hardware components
- DHT11 - Humidity & Temperature Sensor
- BMP180 - Barometric Pressure Sensor
- OLED display 128x64 I2C (SSD1306)
- Raspberry Pi with Raspbian (I have used Raspberry Pi Zero)
- 1x 10K resistor (as a pull-up for DHT11 between VCC and DATA)
- Few wires
Raspbian packages
sudo apt-get install -y \
build-essential \
python-dev \
python-openssl \
python-pil \
python-smbus \
i2c-tools
PIP libraries
Note: Before you install python modules by pip, you should consider use of a python virtual environments. See next section of this readme.
pip install -r requirements.txt
Used Raspberry Pi GPIO pins:
- 3.3V Power - Red wire (Physical pin 1)
- GPIO 2 (SDA) - Black wire (Physical pin 3)
- I2C Data
- GPIO 3 (SCL) - White wire (Physical pin 5)
- I2C Clock
- Ground - Grey wire (Physical pin 6)
- GPIO 4 - Brown wire (Physical pin 7)
- DHT11 Humidity sensor data pin
The 10k resistor is used as a pull up between VCC and DATA of DHT11.
1) Install all necessary packages:
sudo apt-get install virtualenv virtualenvwrapper
2) Add the next two lines at the bottom of your ~/.profile file:
export WORKON_HOME=~/.virtualenvs
source /usr/share/virtualenvwrapper/virtualenvwrapper.sh
Note: If you have ~/.bash_profile file, then you need to add it there
as in that case the ~/.profile won't be read.
3) Create a virtual env
mkvirtualenv --system-site-packages raspberry-meteostation
Note: We are allowing system site python packages to be available in our virtual env here.
When you are ready to work on the new virtual env
workon raspberry-meteostation
Once you are done deactivate the virtual env
deactivate
List devices available on I2C bus and their addresses:
i2cdetect -y 1