DHT22 - switched sensor types?

[simonszu]

Hi,

i am trying to set up a DHT22 node. This is my first step with mysensors ever. After figuring out some hardware issues, all connection is working, at least for a distance of around 1 meters.

However, i'd like to ask how big can a temperature offset of a DHT22 sensor be? I have a room temperature of around 22°C, however, this sensor shows around 28°C - and a humiditiy of 23%. So, either the measurement tolerance is quite big, or i have somehow switched both readings.

This is the code i have flashed on the node: https://pastebin.com/E2XWu3F3
And this is how it appears in Home Assistant: https://pastebin.com/rLWn91ws

Is my code correct? I think i have some weird errors, e.g. only increasing temperature is registered, when decreasing temperature, the value isn't decreasing as well.

[Boots33]

@simonszu Looks like you have the temp and humidity swapped around in the send message part

here is a direct copy of your sketch. you are sending the temperature in the humidity message and humidity in the temp message

  send(msgHum.set(temperature, 1));    // this should be humidity
  #ifdef My_DEBUG
  Serial.print("T: ")
  Serial.println(temperature);
  #endif
  send(msgTemp.set(humidity, 1));   // this should be temperature

[simonszu]

Ah. Yeah. Thanks. Sometimes one can be really blind when debugging own code.

[Boots33]

@simonszu Yes I know the feeling well !! Hope it all works as expected now

[gohan]

dht sensors are not very accurate anyway