DHT22

pcmanbob

Hi.

Yes you can run both the dht22 sensors and the RTC either using the two 3.3v pins on the gpio or by connecting all to one pin via a PCB that all the components are connected to.

MadHoover

... time - I know very, very little about circuits and such so this was an accomplishment ;) ). So whilst I know you can get temperature components (dht22 sensors) and real time clock modules (ds3231) that the pi can use I don't know if they can be combined together. Since ds3231 draws 3.3V and I ...

EZKernel

thanks for your reply Joan, I was figuring if they were kernel level processes they would get absolute process priority and others in the forums have said that it had worked for them. I agree with you that this sensor sucks. I actually ran across your website when someone compared it to lol_dht as w...

joan

... (e.g. BME280, Si7021 etc.) that works on the I2C bus. I doubt that the kernel modules will be any better than user space modules at reading the DHT22. Have a look at my user space http://abyz.me.uk/rpi/pigpio/examples.html#pdif2_DHTXXD (requires the pigpio daemon to be running). I doubt you ...

EZKernel

... well. https://github.com/seblucas/lol_dht22 there are 3 more individuals that have written kernel drivers (.ko files) https://github.com/Filkolev/DHT22-sensor-driver https://github.com/KermsGit/dht22 https://github.com/edwardlintw/DHT22 however, I've come to a roadblock in setting up the correct ...

EZKernel

Hi all, sorry that I am asking for help on my first post but I thought I might as well say hi. My background is in finance, accounting and data analysis so I know very little about electrical engineering and safety, I have done an energy physics course in university and that is not saying much. I do...

ghp

Instead of reading in the glass ball, I would prefer to read the CGI script. Probability for good answers increases with the number of lines of codes posted here.

joan

I would search for the '<!--' in one of the scripts you are executing. It sounds like that script is being returned as the result rather than being executed.

finndus

Hi, I'm having trouble reading an Adafruit DHT22 sensor (temperature/humidity) through a CGI python script, when called from the webpage. I know the backend programme works as it is logging the temperatures to a sql database, but when I try to ...

joan

It also looks like the DHT - pin is connected to 5V and the DHT + pin is connected to ground. That might destroy the DHT and the Pi.

danjperron

The third picture show me that you are using 5V instead of 3.3V. This is wrong since that type of DHT22 pcb use a pull-up connect to the + pin. Then you put 5V on your GPIO.

First try it at 3.3V instead of 5V and change the GPIO pin in case you burned that GPIO pin using 5V.

pcmanbob

Hi. For us to help we need to see your pictures for a start, up load them to imgur.com and then post the links in your post , we also need to see the code you are using to understand how you are attempting to access the sensor. please use code tags when posting code Add [ code] at the top code goes ...

peppy.player

Не совсем обычный вариант питания - через HDMI. Похоже очень малопотребляющий дисплей.
Обычно питание происходит либо через GPIO, либо через отдельный USB кабель.

Решений вашей задачи существует вагон и маленькая тележка. Не совсем понятно какой
ответ вы ожидаете услышать.

VGusev2007

Ребята, вот такую штуку хочу, но не врубаюсь как она питается: https://youtu.be/vegC5Ng5Nzc , прямо от малинки, по HDMI?

5inch HDMI LCD, HDMI дисплей 800×480px с резистивной сенсорной панелью для Raspberry Pi

-jubjub-

I'm having a devil of a time getting my DHT22 to work on my Raspberry Pi. I have a Pi 1 Model B Rev 2 where the PCB says "Raspberry Pi (c)2011.12." Running Raspbian Lite. I have been roughly following the directions at this site: http://home-automation-community.com/temperature-and-humidity-from-am2302-dht22-sensor-displayed-as-chart/. ...

Andyroo

... bit old but covers the main ones I’ve seen mentioned here https://www.linuxlinks.com/Automation/ Take care with the humidity sensor - most of the DHT22 / AM 2320 are not worth the money - they fail and report very very odd data. Go up to the Bosch BME680 - more money but worth it. For soil moisture ...

VGusev2007

... не популярные, не купить в РФ так просто, во вторых занимают GPIO - не понятно, они занимают половину слота, как минимум, останется ли место для DHT22 или нет. Спасибо. Что-то не дорогое желательно бы. Это может быть TFT (лучше всего), e-lnk, светодиодные матрицы (сементы). Решение хотелось бы ...

ameador1

... on - at least 2 of them would be in a series pair running from a single IO pin. So this should all be good. Oh, and this will also be running my DHT22 sensors data reads. I was using an Adafruit 757 logic leveler so I could run them at 5V - but since running this MCPx at 5V - I can move the DHT22s ...

joseplaselva

... #-------------------------------------------READING INITIAL TEMPERATURES--------------------------- humi, temp = dht.read_retry(dht.DHT22, 23) temperature = '{0:0.1f}'.format(temp) humidity = '{1:0.1f}%'.format(temp,humi) temp_intdoor = temperature + graus temp = os.popen("vcgencmd ...

samiraawad

... from the 3.3v rail and not 5v, look at this for an example. https://tutorials-raspberrypi.com/raspberry-pi-measure-humidity-temperature-dht11-dht22/ the same with your MCP3008 it should be connected to 3.3v for power ( VDD ) and ref. https://i.imgur.com/QxgSuG5m.jpg if your sensor connected ...

pcmanbob

... from the 3.3v rail and not 5v, look at this for an example. https://tutorials-raspberrypi.com/raspberry-pi-measure-humidity-temperature-dht11-dht22/ the same with your MCP3008 it should be connected to 3.3v for power ( VDD ) and ref. https://i.imgur.com/QxgSuG5m.jpg if your sensor connected ...

yv1hx

... purposes a simple Temperature & Humidity datalogger, using an DS18B20 temp sensor for sensing an equipment rack and a AM2302 (also know as DHT22) Temperature & Humidity sensor for registering the ambient temperature inside the room. This setup is running 24 hours a day registering all three ...

srpape

... issues with 1wire, specifically a DS18B20, including CRC errors and the device disappearing. I also had reliability issues with an AM2302 (a wired DHT22), and was relying on both sensors together to make some kind of sense, but it was frustrating me. I just remembered this morning that I had made ...

MarkDH102

I too use the BME280.
I used to use the DHT22 but running the 2 in parallel showed the BME280 seemed to be more accurate.
My DHT22 were always reading about 20% over the correct level - but were consistent...

Joel_Mckay

We use the BME280 (several years of uptime), and I dumped the DHT/SHT units we sampled in the e-waste recycling bucket after testing the repeatability over several months (cleaved the leads off to ensure they stayed gone). I suggest you do the same... as although there will be a few people who insis...

Search found 1974 matches: DHT22

Re: Temperature sensor and real time clock

Temperature sensor and real time clock

Re: DHT22/AM2302 and I/O conflicts

Re: DHT22/AM2302 and I/O conflicts

Re: DHT22/AM2302 and I/O conflicts

DHT22/AM2302 and I/O conflicts

Re: Adafruit DHT22, CGI and Apache

Re: Adafruit DHT22, CGI and Apache

Adafruit DHT22, CGI and Apache

Re: Can't get DHT22 to work

Re: Can't get DHT22 to work

Re: Can't get DHT22 to work

Re: Не дорогой дисплей совместно с датчиком DHT22

Re: Не дорогой дисплей совместно с датчиком DHT22

Can't get DHT22 to work

Re: Automation of green house parameters control

Не дорогой дисплей совместно с датчиком DHT22

Re: MCP23017 Specs mA per IO and overall mA across all IOs

Getting crazy with tkinter text widget

Re: no readings from sensors

Re: no readings from sensors

Random spikes with AM2302 Temperature & Humidity sensor

Reducing 3b+ ARM clock speed - I/O issues

Re: DHT22 Accuraty.

Re: DHT22 Accuraty.