AM (wired DHT22) temperature-humidity sensor . DHT11 datasheet (https ://)(in chinese, so see the DHT22 datasheet too!). AM digital temperature and humidity module is a digital output signal containing a calibrated temperature and humidity combined sensor. It uses a. AM Datasheet PDF Download – Digital temperature and humidity sensor, AM data sheet.
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In my tests it did exactly what it datasheeet supposed to. The absolute errors were a little larger than advertised, but repeatability was good and the thermal dependence not too severe. For the other sensors, where the slope of my data matches the slope of the reference data e. I have nothing much specific to say about this, but I mean that in a good way. This would not have been required if I had only one each of the different device models.
The Si is a lot slow slower than all the others, which I assume to be a deliberate design choice by the manufacturer to make the sensor insensitive to insignificant, rapid fluctuations in humidity and to better represent the wider prevailing conditions.
The test is potentially unfair though given that they were brand new and are being compared against two-year old DHT22s and SHT A ‘perfect’ sensor would be a featureless green plane at zero. All the other sensors were multiplexed onto the I2C bus. The dstasheet calibration sources are the same as before, eleven saturated solutions and distilled water.
AM Datasheet PDF –
Most of the others seem comparable to each other except the Si which is the one major outlier. The devices now included are: Front Page Kimberly Robert Hygrometers. The large datasjeet of the blue points however show that the calibration degrades rapidly with varying temperature.
Drivers for other sensors were based on datasheets and sample code published by their respective manufacturers.
DHT22 Sensor Pinout, Specs, Equivalents, Circuit & Datasheet
These same data are presented in more detail in Figure 4. It is a nice compact and apparently robust unit, especially with the optional cover screen.
Absolute accuracy seems comparable to the other sensors apart from the BME Left panel shows data directly from the sensors. AM F output saturates at A couple of sensors do show a strong effect. They seem to under-promise and over-deliver, so a priori I am not expecting datasueet outside the specified range.
Notes on particular sensors: It is also the only model for which every device I own performs within specification. The left panel shows the actual results you would get when using the device and the right panel more directly compares the intrinsic physical response of the sensor elements.
I am not sure. Am23022 you are trying to interface it with some other MCU then the datasheet given below will come in handy. For all the other devices the numbers above are the maximum tolerances and most also offer better ‘typical’ specifications.
The difference is small 0. The word is derived from ancient greek for ‘lagging behind’.
These plots show the error of each sensor am2032 a function of humidity. It has a very rapid response, good if you need it, but will likely need filtering and smoothing if you are more interested in meteorological humidity. Easily the best performers though are the BME which are both accurate and consistent over the range tested.
To show those differences in more detail I present plots for a single chemical as the temperature is systematically varied.
Finally, if a sensor is to be used to measure humidity under a range of varying temperatures a full bivariate calibration is required. For details of how the experiment works, please refer to the previous write-ups. Plotted for comparison are values taken from the published literature.
The DHT22 is a commonly used Temperature and humidity sensor. Plots showing deviation of each device’s own temperature from the average of all nine, plotted as a function of humidity. I do not distinguish between the case of the sensor having a very slow response many hours but eventually asymptotically approaching the ‘true’ value and the case of a sensor that is permanently biased by its history and would never reach the same ‘true’ value when approaching from above or below.