DataSheet
https://akizukidenshi.com/download/ds/aosong/DHT11.pdf
Tutorial:
https://iotbykarthik.wordpress.com/2016/02/07/dht11-spi-and-raspberry-pi/
IoT temperature and moisture sensor integrated to Node-RED and Bluemix IBM
Amazon:
Configuration:
Add to those 2 files: sensorLib:require('node-dht-sensor'),sudo vi /home/pi/.node-red/settings.js
sudo vi /usr/lib/node_modules/node-red/settings.js
sensorLib:require('node-dht-sensor'),