Measurement and monitoring of air humidity

Question

Do it yourself

Good night, habr!

There is a room, it is possible to put a server on Linux there (well, or something else).
Task: Periodically measure and monitor air humidity.
What sensor to use? Scheme?

Everything is clear with the air temperature, just look at habrahabr.ru/post/55780/.
But with humidity - no. But I really want to figure it out. Thank you.

Answer 1

Generally.
I solved the problem by buying a Chinese thermometer with a hygrometer function for $ 12 at the nearest electronics store.
Humidity measures very adequately, there is a remote temperature sensor.
Memory for maximum and minimum humidity/temperature.
Satisfied.
Here he is:

Answer 2

You can do it hardcore and with an interesting task on the computer. vision:
• find an old but serviceable psychometer
• look at it with a webcam
• detect the temperature of thermometers on the pictures
• determine the humidity according to the table

Answer 3

Do you need something like this ?

Answer 4

2 temperature sensors, one in a humid environment, the other in a dry one. We get a cheap homemade psychrometer. Well, then we programmatically calculate the humidity. Sensors will fit the ones listed in the article in your question. You can connect them not through COM, but through a ready-made controller on USB - it will pull many of these sensors at once.

Answer 5

Almost any humidity sensor
www.sparkfun.com/products/8227
plus Arduino connected via usb to the server.
The sensor outputs data, the arduino interprets it and sends it to the server.

Answer 6

If you need to quickly and easily solve the problem in an industrial way, without bicycles, then something like this may be suitable: www.apc.com/products/family/index.cfm?id=400

Answer 7

netping.ru/product_item.aspx?id=_acces_sensr_wet_sensor - this is the solution we use. Works great