![]() ![]() Uploads go perfectly every time from this Windows pc and other sketches I've loaded up just as I would expect in every way. Besides this odd issue with DHT sensors it works flawlessly. I'm also entirely open to the option that I might be doing something stupid and take no offense to being shown where I'm in error. Just let me know what will be most helpful. I will gladly recreate and further test the issue or provide any additional detail that might help with resolution. When using GPIO 3 (stealing from serial) the humidity is correct but the temperature is no different - still nothing close to a temperature.įorgive any lack of necessary detail here. As an example the current outdoor temperature pressure and humidity as read by my davis weather station are Temperature 70F, Pressure 31in, Humidity 26 and my current reading from the pi, sitting behind my house without direct sunlight are, converted for matching units Temperature 75.7, Pressure38.5, Humidity 20. ![]() When using GPIO 2 the reading is inaccurate for both temp and humidity. I've attempted on two different GPIO pins. Upon each receive of data from the DHT11 the values change drastically, by thousands. ComparePressures.png (58.I've got a DHT11 sensor that reads correctly on an arduino nano but when used with the esp8266 arduino code it gives wildly inaccurate, rapidly changing values. Temperature and humidity relate more to the local environment around the instrument, so they are not a reliable measure of the air temp and humidity in the room.Ĭomparison of pressure measurements between sense hat and weather stations. I think this confirms the accuracy of the pressure sensor on the sense hat, once you figure out the offset and apply it. The AWS is smoother because it is sampling at hourly intervals, whereas the others are sampling at 10 min intervals. You will see that the sense hat and PWS pressures are duplicated even down to small fluctuations. Direct sunlight can cause the temperature readings to be higher than the actual temperature, and places more likely to get. I have not applied the offsets so that you can compare the curves better. Trees, buildings, and other structures can cause turbulence in the air, leading to inaccurate readings. It is for a couple of days earlier this month when there was a large change in pressure. The attached plot compares pressure measured by the sense hat with pressure from a personal weather station (PWS) sitting alongside the sense hat, and with pressure from a MetService automatic weather station (AWS) in the next street. Thereafter, you'll get the correct pressure readings. You need to calibrate it against known pressure (your Davis perhaps), find the offset and add or subtract to the sense hat pressure. it might increase the pressure but it should lower the humidity.Ītmospheric pressure will have an offset that depends on altitude and a few other parameters. Like I said, the temp I know will be variable (I have a pimoroni black hat to move the sense hat off of the pi itself)īut that doesn't explain the other numbers being skewed unless the warmer temps are directly affecting the other Temperature = 70F, Pressure = 31in, Humidity = 26%Īnd my current reading from the pi, sitting behind my house without direct sunlight are, converted for matching units I would understand if it were just the temperature as I've seen the threads about the cpu thermals interfering with the temp sensor on the sense hat but all of my sensor reedings seem to be really off.Īs an example the current outdoor temperature pressure and humidity as read by my davis weather station are I know that this has to be my inexperience with python or the sense hat or something so I'm certainly not blaming the hardware but my readings seem to be wildly inaccurate. So I've been trying to make the best of this for a few days but it's just driving me crazy. ![]()
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