Can I have some examples for Humidity/temperature sensor

[abhipoints]

I need some examples of Humidity Sensor available in the market. Can anyone help me out? I am writing an article on it and I needed it badly.

[Aeternam]

I have recently built a project using one of these http://sensing.honeywell.com/index.php?ci_id=142285

Works reasonably well, chose it primarily because of the I2C bus.

[JacquesBBB]

Let me quote a recent post

Avoid the DHT11,

their indications are close to none.

I have recently bought 10 DHT12 which are supposed to be an improved version, but which in fact differ from the DHT11 only by the interface.

After some preliminary testings, I have set up a more complete experiment with 9 sensors at the same time.
They give answers that are extremely different for the humidity. Not at all within the advertised specs of the  maker (AOSONG) which says 5% for the DHT11 (did not find the DHT12 datasheet)

The temp seems OK, but

I got   48%, 52%,  56%,  59%,  61%,  68%, 69%, 72%, 72%    for the Humidity output

so  a max difference of 24%  which is  huge.


A same experiment with 5 DHT22 gave much better results

DHT22 

Hum: 63.20 % 60.50 % 63.30 % 65.30 % 66.20 %     Temp: 24.60 C 23.70 C 23.40 C 22.90 C 23.10 C
Hum: 63.20 % 60.50 % 63.30 % 65.30 % 66.30 %     Temp: 24.60 C 23.70 C 23.40 C 22.90 C 23.10 C
Hum: 63.30 % 60.50 % 63.30 % 65.30 % 66.30 %     Temp: 24.70 C 23.70 C 23.40 C 22.90 C 23.10 C

[ebclr]

Humidity is one the most hard thing to measure accurate.

Basically have 4 kinds of sensor

Resistive ( a real piece of sh.... ) Minimum 5% typycal 20%

Capacitive, widely used limited acuracy 2% good and expensive brands 20% cheaper chinese ones

Chilled Mirror expensive and good,

Psychometric chart  processing, Dry wet buld temperature sensor most reliable one at medium price

[grifftech]

eBay auction: #Durable Analog Hygrometer Humidity Meter Power-Free Indoor Outdoor High QualityW