I have completed my first Raspberry Pi project last weekend. It is a Pi Zero Wireless running a DHT11 temperature/humidity sensor.
I have it set to take a reading every 5 seconds and average this out and upload to WeatherUnderground. It also has a quad alphanumeric display for local viewing.
Basically, since I have been uploading to WeatherUnderground I notice that my neighbouring stations have around a 4-6 degree variation on my reading of temperature and the humidity is way off sometimes by a factor of 2.
I have also placed an Oregon Scientific BAR218HG next to it and observed this same behaviour. I’m starting to think the DHT11 sensor I have may be faulty.
I have my setup outside, in constant shade (under the patio) which to my understanding is typically where a thermometer type setup would be placed (rather than in direct sunlight).