Main Site Documentation

Driver - DHT22 (RHT3) - Temperature and Humidity sensor


#1

[title]DHT22 (RHT3) - Temperature and Humidity sensor[/title]
http://code.tinyclr.com/project/340/dht22-rht3---temperature-and-humidity-sensor/
[line]
The DHT22 (also known as RHT03) from MaxDetect is a simple and cheap temperature + humidity sensor, using a proprietary single wire protocol, similar to the DHT11 which already has its driver on code.tinyclr.com (however the data flow is different). This is not compatible with OneWire. Compared to the DHT11, the DHT22 accepts negative temperatures and is more accurate.

Due to timing issue, to avoid RLP complexity, we are using here 2 separate datapins (must be interrupt pins !) linked together in harware at high impedance in order to be able to generate and read the necessary signals (please read the DHT22 notice attached).

Please report bugs to f1iqf@ hotmail.com


#2

Just noticed that you have three projects with the same title.What is the difference?


#3

You are right- I don’t know how it happened ?!
I have only one code project. I only checked the tickbox for the forum once.
However when I checked the box for all y projects, I remember that when I validated one of the projects (not sure which one !) the bowser didn’t respond (page loading…) so after a few minutes I hit the F5 “reload” of the page and it was ok then. Maybe this one !

Maybe a little bug somewhere, @ Josh ? :wink:


#4

Each post goes to a unique project (look at the number). However, they all have the same name.

http://code.tinyclr.com/project/340/dht22-rht3---temperature-and-humidity-sensor/
http://code.tinyclr.com/project/318/dht22-rht3---temperature-and-humidity-sensor/
http://code.tinyclr.com/project/323/dht22-rht3---temperature-and-humidity-sensor/