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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See ‘Update March ‘ above.

(PDF) AM2302 Datasheet download

The sensor comes with a dedicated NTC to measure temperature and an 8-bit microcontroller to output the values of temperature and humidity as serial data.

Repeatability at a fixed humidity is very good. For this test the BME’s internal smoothing filter was switched off. Looking at that the bivariate temperature: Deviations from the known reference value as humidity is systematically cycled from high to low and back to high.

It is true though that all values will be slightly biases one way or the other as conditions change. I made no attempt here to establish an absolute temperature calibration and datasheft compare each sensor to the ensemble average of all nine sensors.

As previously noted, this is my cherry-picked, best AM from a sample of six.

Where the slopes of the measurements and reference data differ e. It is a feature of dataasheet the AM23xx devices that they return a cached value from memory meaning they will always appear to respond to a change one reading 6 seconds later than the others. However, investigating in more detail, the Bosch thermometers are very weakly humidity sensitive. For this reason I plot both the raw data where the AM23xx devices can all be seen to lag by one reading and also a version where that offset has been artifically removed.


Compare DHT22, AM, AM, AM, SHT71, HTU21D, Si, BME

Time response of the devices when exposed to a2302 sudden downwards change in humidity. Be careful with variable types in your software.

A small adjustment to the internal calibration parameters could possibly bring this device to very nearly match the BME This device is a bit different.

Drivers for other sensors were based on datasheets and sample code published by their respective manufacturers. This page will present only new results. The others all continue uneffected but values were only logged from this sensor when they were sensible.

The duration of each host signal is explained in the datasheet, with neat steps and illustrative timing diagrams.

Here I have added five new devices meaning this test now covers most commonly available low-cost digital hygrometers. The devices now included are: For example, with the highly responsive HTU21D, I often see spikes and wobbles in the readings as I move around the room, stiring the air.

AM2302 Datasheet

In contrast, the AM device G shows little error as a function of humidity Figure 12 but has the largest error as a function of temperature Figure Though not discussed in detail on this page, the effect of using the protective cover on the response speed has been investigated elsewhere. It is physically a little smaller, but with identical pin-out. So long as you do not attempt to read the device serial number, these three sensors function identically. The same device as was used in previous tests.


They have remained fairly consistent over the six months between the two experiements. The one difference I have found and possibly the only way to be sure which device you have is in the devices’ unique serial numbers for which each manufacturer uses a slightly different format, detailed in their respective datasheets.

Figure 11 shows an apparent scatter but replotting temperature errors as a function of humidity Figure 12 shows a tight correlation with very little dispersion. All data collected, irrespective of temperature, are shown as blue dots.

datashfet All agree within about 0. Each of these three sensors showed advantages in one paramter or another, but given that I am only testing one example of each I cannot say if those are features of the device type or just my particular specimen. Blue shows low readings and red are high.