Search found 1974 matches: DHT22

Searched query: DHT22

Go to advanced search

by gstreeter
Sun Jan 05, 2014 8:57 pm
Forum: Troubleshooting
Topic: [SOLVED] DHT11/DHT22 showing incorrect humidity
Replies: 13
Views: 24637

Re: DHT11 is showing incorrect humidity

Onira wrote:which one is better then, DHT11 or DHT22 ?
The DHT-22 is more accurate but costs more. I found the results from the 22 more stable than the 11 under test.
by Onira
Sun Jan 05, 2014 5:33 pm
Forum: Troubleshooting
Topic: [SOLVED] DHT11/DHT22 showing incorrect humidity
Replies: 13
Views: 24637

Re: DHT11 is showing incorrect humidity

which one is better then, DHT11 or DHT22 ?
by Onira
Sat Jan 04, 2014 6:22 pm
Forum: Troubleshooting
Topic: [SOLVED] DHT11/DHT22 showing incorrect humidity
Replies: 13
Views: 24637

[SOLVED] DHT11/DHT22 showing incorrect humidity

Code: Select all

$ sudo ./Adafruit_DHT 11 25
Using pin #25
Data (40): 0x27 0x0 0x16 0x0 0x3d
Temp = 22 *C, Hum = 50 %
do I need to calibrate it?
by DougieLawson
Sat Dec 28, 2013 1:35 pm
Forum: Python
Topic: Google Docs and create a new spreadsheet
Replies: 1
Views: 2044

Re: Google Docs and create a new spreadsheet

Search for DHT22 and raspberry pi.
http://learn.adafruit.com/dht-humidity- ... g/overview

That's some sample code that uses the Google Docs API.

There's also lots of stuff at http://developer.google.com
by DougieLawson
Mon Dec 23, 2013 1:48 am
Forum: Beginners
Topic: Temperature
Replies: 12
Views: 4962

Re: Temperature

... You can use a web server with php to extract data from your database to display it or graph it, but not for data collection. Search on here for DHT22 https://www.google.com/search?q=dht22+site%3Araspberrypi.org there's lots of threads on data collection using that device (some of it going directly ...
by jandrillox
Sat Dec 21, 2013 12:48 am
Forum: Español
Topic: DHT22 (AM2301)
Replies: 2
Views: 1318

Re: DHT22 (AM2301)

... como el otro. 20131221002001,55.1 8.5 con el DHT-22 20131221002001,43.0 22.0 con el DHT-11 Pero la alegria me duro poco, ahora el problema con el DHT22 es que solo me muestra la humedad en la grafica. He seguido este enlace como guia: http://www.kbza.org/2013/06/13/monitor-de-temperatura-y-humedad-con-raspberry-pi/ ...
by fa_byed
Fri Dec 20, 2013 2:02 pm
Forum: Español
Topic: DHT22 (AM2301)
Replies: 2
Views: 1318

Re: DHT22 (AM2301)

Yo también tengo el mismo sensor (DHT21/DHT22) y el formato de salida es el mismo que tu mencionas Estoy casi seguro que estas usando un programa de extensión .C para poder leer los datos. Si es así solo tienes que modificar ese archivo a tus ...
by jandrillox
Thu Dec 19, 2013 11:00 pm
Forum: Español
Topic: DHT22 (AM2301)
Replies: 2
Views: 1318

DHT22 (AM2301)

hola, soy nuevo en todo este mundillo de la Raspberry, y me he encontrado con un pequeño problema con este sensor, el DHT22 (AM2301). He montado un DHT11 y me funciona bien, me genera el temp.log en mi apache con este formato: 20131219164301,58.0,21.0 Con lo cual la grafica de la ...
by mrgapo
Wed Dec 18, 2013 2:57 pm
Forum: Automation, sensing and robotics
Topic: DS1820 read from GPIO22
Replies: 5
Views: 2189

Re: DS1820 read from GPIO22

Thank you all. I've changed dht22 to pin22 and set ds1820 to pin 4. Everything is working fine.
by TurtleTemps
Wed Dec 18, 2013 11:31 am
Forum: Automation, sensing and robotics
Topic: Bored over Xmas - Need a project
Replies: 9
Views: 3435

Re: Bored over Xmas - Need a project

... had some fun with some DS18B20 temperature sensors for a first project posting to google docs then to twitter and xively (cosm) and later added a DHT22 temp and humidity sensor, OLED screen and a cheap speaker as the project grew. http://www.youtube.com/watch?v=pS5ePBpw9sY http://www.youtube.com/watch?v=9dCVJIUPspM ...
by TurtleTemps
Tue Dec 17, 2013 2:53 pm
Forum: Automation, sensing and robotics
Topic: DS1820 read from GPIO22
Replies: 5
Views: 2189

Re: DS1820 read from GPIO22

Hi, I have 2x DS1820's running on gpio4 and a DHT22 running on gpio17 if memory serves I just switched to the required pin number in the code http://pastebin.com/d8fyEaiq
by rpdom
Mon Dec 16, 2013 9:16 pm
Forum: Automation, sensing and robotics
Topic: DS1820 read from GPIO22
Replies: 5
Views: 2189

Re: DS1820 read from GPIO22

I think the DHT22 doesn't use the one-wire bus protocol which the DS18B20 requires. The standard one-wire driver only works on gpio4.

It is easier to change the code that drives the DHT22 to use a different pin.
by mrgapo
Mon Dec 16, 2013 8:58 pm
Forum: Automation, sensing and robotics
Topic: DS1820 read from GPIO22
Replies: 5
Views: 2189

Re: DS1820 read from GPIO22

DHT22 is compatible with DS1820 AS I know
by mrgapo
Mon Dec 16, 2013 8:07 pm
Forum: Automation, sensing and robotics
Topic: DS1820 read from GPIO22
Replies: 5
Views: 2189

DS1820 read from GPIO22

Hi,
I have a problem. I am already connected DHT22 senzor to gpio4. Now I am trying to connect DS1820 sensor to GPIO22 pin. Is it possible?
I am smashing my head with this problem.

Thanks
by christoph.tewes
Wed Dec 11, 2013 8:43 am
Forum: Camera board
Topic: Motion - MMAL camera
Replies: 472
Views: 417788

Re: Motion - MMAL camera

... purposes. My idea was to add sensors and include temperature, humidity and pressure in the picture. The sensors are a 1-wire DS18B20, I2C DHT22 and BMP085. Each of them (and in any combination) is working ok. BUT, as soon as I want them to run at the same time as Motion-MMAL it's not working ...
by StonieMalony
Tue Dec 10, 2013 8:37 pm
Forum: Advanced users
Topic: how long can be cables ?
Replies: 3
Views: 2969

how long can be cables ?

Hi there, I would like to ask how long can different cables be ? I have right now 5 DHT22 sensors running from 3m to 10m cable and work fine but is there somesort of standard or something to say how long this cable can and should be ? also I have idea to install methane ...
by MaybeSomeDay
Mon Dec 09, 2013 3:41 pm
Forum: Automation, sensing and robotics
Topic: wireless temperature sensor
Replies: 20
Views: 100833

Re: wireless temperature sensor

Hi,

I may accidentally bought USB-WDE1 -kit. But now I have little problem. Is there any tips how to got that USB-WDE1 information to Xively?

I send now there my DHT22 sensor information.
by Sarge
Mon Dec 09, 2013 2:05 am
Forum: Automation, sensing and robotics
Topic: DHT22 humidity sensor stops working
Replies: 11
Views: 10336

Re: DHT22 humidity sensor stops working

I've got this Adafruit DHT22 sensor. It has been working indoors without a problem since May. The key for me was this person's code: https://github.com/technion/lol_dht22 . Of course, it gets rejects but continues polling until it gets ...
by Douglas6
Sun Dec 08, 2013 6:08 pm
Forum: Automation, sensing and robotics
Topic: DHT22 humidity sensor stops working
Replies: 11
Views: 10336

Re: DHT22 humidity sensor stops working

RogueBarbarian wrote:Got mine from Adafruit and no way to provide feedback there.
http://forums.adafruit.com
by okwatts
Sun Dec 08, 2013 3:05 pm
Forum: Automation, sensing and robotics
Topic: DHT22 humidity sensor stops working
Replies: 11
Views: 10336

Re: DHT22 humidity sensor stops working

I have not used these with the raspi yet, but have about 6 going on Arduino and Pic processors reliably. They are used as remote Temp/humidity sensors for my wireless weather station and I have been happy with them. They do take a while to adjust to changes and while not as accurate as the SHT11 the...
by RogueBarbarian
Sun Dec 08, 2013 2:54 am
Forum: Automation, sensing and robotics
Topic: DHT22 humidity sensor stops working
Replies: 11
Views: 10336

Re: DHT22 humidity sensor stops working

Nothing but problems with this sensor, I tried everything here, both the prewired and unwired hang the GPIO port, and once it hung, must be completely powered off. The hang is in the BCM library on the wait, upgraded to the latest version of that library, v.33 and no change. Will try the Arduino, bu...
by CharlyDelta
Sat Dec 07, 2013 10:40 pm
Forum: Automation, sensing and robotics
Topic: DHT22, Adafruit DHT Driver... sub-zero issue (SOLVED)
Replies: 8
Views: 5392

Re: DHT22, Adafruit DHT Driver... sub-zero issue

I'm really impressed ... with WebIDE I can work remotely and even repair a file ... and now, the negative temps prints on GoogleDocs !!

Thank you Dougie, I learned a lot today.
by DougieLawson
Sat Dec 07, 2013 7:46 pm
Forum: Automation, sensing and robotics
Topic: DHT22, Adafruit DHT Driver... sub-zero issue (SOLVED)
Replies: 8
Views: 5392

Re: DHT22, Adafruit DHT Driver... sub-zero issue

So that's an exact copy of the code in [url]git://github.com/adafruit/Adafruit-Raspberry-Pi-Python-Code.git[/url] that you've simply updated with your Googledocs ID. The regex matches = re.search("Temp =\s+([0-9.]+)", output) won't match a negative temp. If we change it to: matches = re.search("Temp...
by CharlyDelta
Sat Dec 07, 2013 7:03 pm
Forum: Automation, sensing and robotics
Topic: DHT22, Adafruit DHT Driver... sub-zero issue (SOLVED)
Replies: 8
Views: 5392

Re: DHT22, Adafruit DHT Driver... sub-zero issue

I didn't know that fonction :oops: Thanks a lot Dougie !! jens, I'll look it tomorrow #!/usr/bin/python import subprocess import re import sys import time import datetime import gspread # =========================================================================== # Google Account Details # =========...
by SunshineGrrrl
Sat Dec 07, 2013 8:53 am
Forum: Automation, sensing and robotics
Topic: Is my DHT22 dead? or just my brain?
Replies: 7
Views: 5525

Re: Is my DHT22 dead? or just my brain?

Basically, how the code works is: Step 1: First it sets the pin low and then waits a few microseconds. Step 2: Set the pin high. This signals the DHT22 to begin reporting its information. Step 3: The DHT22 will respond by setting it low and then high to let the pi know that it caught the signal ...

Go to advanced search