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94 lines
3.6 KiB
Markdown
94 lines
3.6 KiB
Markdown
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[](https://github.com/marketplace/actions/arduino_ci)
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[](https://github.com/RobTillaart/DHTlib/actions/workflows/arduino-lint.yml)
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[](https://github.com/RobTillaart/DHTlib/actions/workflows/jsoncheck.yml)
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[](https://github.com/RobTillaart/DHTlib/blob/master/LICENSE)
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[](https://github.com/RobTillaart/DHTlib/releases)
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# DHTlib
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Arduino library for DHT temperature and humidity sensor. AVR optimized
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## Description
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The DHT11, 21, 22, 33 and 44 are relative inexpensive sensors for measuring temperature and humidity.
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This library can be used for reading both values from these DHT sensors.
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The DHT11 only returns integers (e.g. 20) and does not support negative values.
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The others are quite similar and provide one decimal digit (e.g. 20.2)
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The hardware pins of the sensors and handshake are identical so ideal to combine in one lib.
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The library (0.1.13 version) is confirmed to work on:
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- UNO (tested myself)
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- 2009 (tested myself)
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- MEGA2560
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- DUE
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- attiny85 @8MHz
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- Digistump Digix @ 84 MHz
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Later 0.1.xx versions are optimized for AVR only.
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More information - http://playground.arduino.cc/Main/DHTLib -
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For latest version for the DHT, check https://github.com/RobTillaart/DHTNEW
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## DHT PIN layout from left to right
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| Front | | Description |
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|:------|:----:|:--------------|
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| pin 1 | | VCC |
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| pin 2 | | DATA |
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| pin 3 | | Not Connected |
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| pin 4 | | GND |
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## Operational
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See examples
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## Versions:
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==> See DHTStable library for latest stable version for all platforms.
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- version 0.1.13 is the last stable version for both AVR and ARM
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- version 0.1.14 and up are not compatible any more with pre 1.0 Arduino.
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These have breaking changes wrt ARM based Arduino's e.g DUE.
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- version 0.1.15 is stable version for AVR only
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- version 0.1.16 and 0.1.17 have breaking changes for DHT11
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- version 0.1.18 works again for DHT11 (AVR only)
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- version 0.1.19 fixed masking bug DHT11 (AVR only)
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- version 0.1.20 Reduce footprint (34 bytes) by using int8_t as error codes. (thanks to chaveiro)
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- version 0.1.21 replace delay with delayMicroseconds() + small fix (thanks to codingforfun)
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- version 0.1.22 undo delayMicroseconds() for wakeups larger than 8
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- version 0.1.23 fix https://github.com/RobTillaart/Arduino/issues/31
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- version 0.1.24 fix https://github.com/RobTillaart/Arduino/issues/33
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- version 0.1.25 fix https://github.com/RobTillaart/Arduino/issues/80
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- version 0.1.26 Explicit support for AM23XX series and DHT12
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- version 0.1.27 added \_disableIRQ flag
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- version 0.1.28 refactor
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- version 0.1.29 fix negative temperature DHT12 - issue #111
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- version 0.1.30 own repo version
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- version 0.1.31 fix negative temperature DHT22 (code from DHTNew)
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- version 0.1.32 fix negative temperature DHT22 again (code from DHTNew)
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- version 0.1.33 fix #6 T-GO signal in handshake. (needed for long wires)
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- version 0.1.34 fix negative temperature DHT22 again (code from DHTNew)
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- version 0.1.35 update license, library.json, #pragma once, minor edits
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## Future
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- updates only on request basis (bugs)
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- improve documentation
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- improve unit tests
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- constants
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- move non public part of #defines to .cpp
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- separate history versions releasenotes file ?
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-
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