DHT11 goes nuts :)

Moderator: leecollings

Post Reply
TankySpanky
Posts: 43
Joined: Wednesday 06 February 2019 18:54
Target OS: Raspberry Pi / ODroid
Domoticz version: Beta
Location: Belgium
Contact:

DHT11 goes nuts :)

Post by TankySpanky »

Hello all ,

I have a RPi and connected a DHT11 sensor, in the beginning all looks fine but after a day and you check the "lines" its goes all up and down
DHT11 Te<br />mp / Hum
DHT11 Te
mp / Hum
2019-07-28 18_22_14-Dashticz Temp-Vocht.png (128.87 KiB) Viewed 2559 times
Im a bit of a noob still and i dont see where it can go wrong....

its the "only" sensor i got hooked up to the pi,
Powersupply is official for the Pi 3b+

It worked oke for a a while
Raspberry Pi 3 B+ & Domoticz Beta & Dashticz Beta = Headache :)
But it keeps you van the straat
TankySpanky
Posts: 43
Joined: Wednesday 06 February 2019 18:54
Target OS: Raspberry Pi / ODroid
Domoticz version: Beta
Location: Belgium
Contact:

Re: DHT11 goes nuts :)

Post by TankySpanky »

No one ?
Raspberry Pi 3 B+ & Domoticz Beta & Dashticz Beta = Headache :)
But it keeps you van the straat
freijn
Posts: 536
Joined: Friday 23 December 2016 16:40
Target OS: Raspberry Pi / ODroid
Domoticz version: Stable
Location: Netherlands Purmerend
Contact:

Re: DHT11 goes nuts :)

Post by freijn »

Apperantly zero values are transmitted or..... connection is lost and values are not received ?

First Question, how long is the cable between sensor and RPI ? Did you apply the resistor as well at the end of the cable ?
TankySpanky
Posts: 43
Joined: Wednesday 06 February 2019 18:54
Target OS: Raspberry Pi / ODroid
Domoticz version: Beta
Location: Belgium
Contact:

Re: DHT11 goes nuts :)

Post by TankySpanky »

Hello,

The cable are about 15cm from breadboard, and the DHT11 is mounted on a small print and no extra restistor is needed ( according the informaton of the item )
DHT11-Temperature-Humidity-Module-1000x750.jpg
DHT11-Temperature-Humidity-Module-1000x750.jpg (76.27 KiB) Viewed 2486 times
Its not "really" this item but it looks like this, with a red led.

Sometimes it works great for hours and otherwise it behaves like the first picture.
2019-08-03 09_24_51-temp hum.png
2019-08-03 09_24_51-temp hum.png (50.9 KiB) Viewed 2486 times
Maybe i just need to buy a DHT22, they seems to be a lot better

ty in advance
Raspberry Pi 3 B+ & Domoticz Beta & Dashticz Beta = Headache :)
But it keeps you van the straat
Toulon7559
Posts: 848
Joined: Sunday 23 February 2014 17:56
Target OS: Raspberry Pi / ODroid
Domoticz version: mixed
Location: Hengelo(Ov)/NL
Contact:

Re: DHT11 goes nuts :)

Post by Toulon7559 »

Looks like somewhere an 'intermittent'' contact:
checking of the cabling may be the solution.

If you want real improvement relative to DHT11, take BME280 as sensor:
provides temperature, humidity and pressure of much better quality.
Last edited by Toulon7559 on Saturday 17 August 2019 12:24, edited 1 time in total.
Set1 = RPI-Zero+RFXCom433+S0PCM+Shield for BMP180/DS18B20/RS485+DDS238-1ZNs
Set2 = RPI-3A++RFLinkGTW+ESP8266s+PWS_WS7000
Common = KAKUs+3*PVLogger+PWS_TFA_Nexus
plus series of 'satellites' for dedicated interfacing, monitoring & control.
TankySpanky
Posts: 43
Joined: Wednesday 06 February 2019 18:54
Target OS: Raspberry Pi / ODroid
Domoticz version: Beta
Location: Belgium
Contact:

Re: DHT11 goes nuts :)

Post by TankySpanky »

Hello,

Oke thanx for the answer i go and look for that :)

greetings

Aad
Raspberry Pi 3 B+ & Domoticz Beta & Dashticz Beta = Headache :)
But it keeps you van the straat
Post Reply

Who is online

Users browsing this forum: No registered users and 0 guests