DHT22 shows 2000°C and 2000% Humidity

[gringo]

Hello everybody,

i have installed a DHT22 but in the DWC it shows 2000°C and 2000% humidity.

This is my configuration:

M308 S12 P"io2.out+io2.in" Y"dht22" A"Bauraumtemperatur"
M308 S13 P"S12.1" Y"dht-humidity" A"Bauraumfeuchte"

Installed as follows:

VCC to 3,3V
Data to io2_in
GND to GND

Any ideas why i get this temperature and humidity shown?

Thanks for helping me.

Regards
Lars

[dc42]

@gringo which Duet?

[gringo]

Duet 3 6HC Firmware 3.4.5

[droftarts]

@gringo see https://docs.duet3d.com/en/User_manual/Connecting_hardware/Temperature_connecting_DHT#wiring

On 6HC

Connect the DHT I/O line to … one of the IOx.OUT pins.

Your config addresses two pins (only suitable for Mini 5+), should be the one pin you actually use for data:

M308 S12 P"io2.out" Y"dht22" A"Bauraumtemperatur[C]"
M308 S13 P"S12.1" Y"dht-humidity" A"Bauraumfeuchte[%]"

Ian

[gringo]

@droftarts

I changed the config as you wrote, but the result is the same

[droftarts]

@gringo did you change the wiring? The DHT one-wire protocol sends data both ways. On the 6HC this requires an output pin, not an input pin. Move the data wire from io2.in to io2.out.

Ian

[gringo]

@droftarts

ah ok, I don´t changed the wiring. I will do it

[gringo]

@gringo

thats it. Now it works.

Thanks a lot @droftarts