DIY DHT11 Humidity and Temperature Sensor
Temperature and humidity measurements certainly are a great add-on to a lot of hobby projects. However [Rajendra Bhatt] makes the point that lots of these types of sensors possess a price tag that is definitely very well above what many hobbiests are able to invest. He thought to take an in-depth look at the DHT11 sensor; which you can get hold of for less than $3 once you discover the best places to search.
The four-pin gadget utilizes a 1-wire protocol. [Rajendra] talks about the details of the communications, showing the part utilizing a PIC 16F628. It’s simple to attach towards your project, requiring VCC, GND, as well as a pull-up resistor on the single data line.
ORIGINAL ARTICLE: http://hackaday.com/2012/01/11/dht11-humidity-and-temperature-sensor-package/
by Robert
"The distance is very far. I would have no doubt that you could control it from 100ft -200ft or more. ..."