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137 lines
4.3 KiB
ReStructuredText
137 lines
4.3 KiB
ReStructuredText
.. include:: ../Plugin/_plugin_substitutions_p00x.repl
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.. _P005_DHT11_DHT22_page:
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DHT11/DHT22
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===========
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|P005_typename|
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|P005_status|
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.. image:: P005_DHT11_DHT22_1.jpg
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Introduction
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------------
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DHT11 and its sibling DHT22 are temperature and humidity sensors which
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using a custom 1-wire protocol. That means that they are not compatible with
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the same 1-wire bus as standard 1-wire units.
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Specifications:
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* Temperature (-40C to +85C)
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* Humidity (0-100 % rel. humidity)
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Wiring
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------
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The DHT sensor needs to be connected to a configurable GPIO on the ESP module.
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In case you have a simple ESP-01 module, it's best to use the GPIO-2 pin.
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.. image:: P005_DHT11_DHT22_2.jpg
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DHT11 (blue)
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.. image:: P005_DHT11_DHT22_3.jpg
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DHT22 (white)
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.. code-block:: none
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ESP DHT11/DHT22
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GPIO (X) <--> Data (2nd pin)
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Power
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5.0V <--> VCC (1st pin)
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GND <--> GND (4th pin)
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.. note:: Do not use GPIO 15 as an input for the DHT11/22. During startup of the
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ESP8266, this pin must be ``LOW`` for proper operation. It is good to
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avoid using GPIO 0 as an input as well. This pin must be ``HIGHT`` at
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startup, unless program mode is required. The data pin of the DHT11/22
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needs a pull-up resistor. A value of 4.7k - 10k proves to be sufficient.
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Setup
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-----
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.. image:: P005_Setup_DHT11_DHT22_1.png
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Task settings
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~~~~~~~~~~~~~
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* **Device**: Name of plugin
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* **Name**: Name of the task (example name **DHT**)
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* **Enable**: Should the task be enabled or not
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Sensor
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^^^^^^
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* **GPIO <--> Data**: Pulse input is generally set to **GPIO 14 (D5)**.
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* **Sensor model**: Pick your **sensor model**, either DHT11 or DHT22.
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Data acquisition
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^^^^^^^^^^^^^^^^
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* **Send to controller** 1..3: Check which controller (if any) you want to publish to. All or no controller can be used.
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* **Interval**: How often should the task publish its value (5..15 seconds is normal).
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Indicators (recommended settings)
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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.. csv-table::
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:header: "Indicator", "Value Name", "Interval", "Decimals", "Extra information"
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:widths: 8, 5, 5, 5, 40
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"Temperature", "Celsius", "10", "1", ""
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"Humidity", "RH", "10", "1", ""
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Rules examples
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--------------
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.. code-block:: none
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On DHT#Celsius Do
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If [DHT#Celsius]>-15
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NeoPixelAll,255,0,0 //Red light
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Else
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NeoPixelAll,0,255,0 //Green light
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EndIf
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EndOn
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.. Commands available
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.. ~~~~~~~~~~~~~~~~~~
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.. .. include:: P005_commands.repl
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How to patch Wemos DHT shield
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-----------------------------
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The Wemos DHT shield uses a pin which is also toggled at boot disrupting the connected DHT22 sensor.
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This causes the sensor to become unresponsive after a reboot.
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The DHT sensor needs to be connected to a configurable GPIO on the ESP module.
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In case you have a simple ESP-01 module, it's best to use the GPIO-2 pin.
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See this `elaborate post on GitHub <https://github.com/letscontrolit/ESPEasy/issues/2569#issuecomment-688901549>`_
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describing the problem and how to patch the board to make it work like it should.
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Where to buy
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------------
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.. csv-table::
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:header: "Store", "Link"
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:widths: 5, 40
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"AliExpress","`Link 1 ($) DHT11 <http://s.click.aliexpress.com/e/Rw9LhDW>`_ `Link 2 ($) DHT22 <http://s.click.aliexpress.com/e/bym03SW8>`_"
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"Banggood","`Link 3 ($) DHT11 <https://www.banggood.com/KY-015-DHT11-Temperature-Humidity-Sensor-Module-For-Arduino-p-916173.html?p=V3270422659778201806>`_ `Link 4 ($) DHT22 <https://www.banggood.com/AM2302-DHT22-Temperature-And-Humidity-Sensor-Module-For-Arduino-SCM-p-937403.html?p=V3270422659778201806>`_"
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"eBay","`Link 5 ($) DHT11 <https://rover.ebay.com/rover/1/711-53200-19255-0/1?icep_id=114&ipn=icep&toolid=20004&campid=5338336929&mpre=https%3A%2F%2Fwww.ebay.com%2Fsch%2Fi.html%3F_from%3DR40%26_trksid%3Dm570.l1313%26_nkw%3DDHT11%26_sacat%3D0%26LH_TitleDesc%3D0%26_osacat%3D0%26_odkw%3DDHT11>`_ `Link 6 ($) DHT22 <https://rover.ebay.com/rover/1/711-53200-19255-0/1?icep_id=114&ipn=icep&toolid=20004&campid=5338336929&mpre=https%3A%2F%2Fwww.ebay.com%2Fsch%2Fi.html%3F_from%3DR40%26_trksid%3Dm570.l1313%26_nkw%3DDHT22%26_sacat%3D0%26LH_TitleDesc%3D0%26_osacat%3D0%26_odkw%3DDHT22>`_"
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|affiliate|
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.. More pictures
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.. -------------
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