Please wire up your DHT11 sensor as below:
To be able to use the DHT11 temperature and humidity sensor we will have to install the Node-Red node and the BCM2835 library to support it, the easiest way is explained below.
#install bcm2835 library cd ~/ curl http://www.airspayce.com/mikem/bcm2835/bcm2835-1.56.tar.gz > bcm2835-1.56.tar.gz tar zxvf bcm2835-1.56.tar.gz cd bcm2835-1.56 ./configure make sudo make check sudo make install #install node cd ~/ sudo npm install --unsafe-perm -g node-dht-sensor sudo npm install --unsafe-perm -g node-red-contrib-dht-sensor
After the commands finish running press enter again to make sure the last one has been run.
Restart your raspberry pi, start Node-Red and search for “dht” you should find a node called “rpi dht22” this indicates that the node has been installed correctly.
The node must be setup as in the below image – make sure you select DHT11