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In multihreaded environment (I used NilRTOS) its usefull to disable interruppts while reading the sensors. However delay() requires interrupts to be enabled. If you read more than one sensor in a sequence the 2nd one gets spurious DHTLIB_ERROR_CONNECT errors. Timing issues with the wakeup delay(). They don't used to happen it interrupts are enabled. Replacing delay() with delayMicroseconds() solved this issue. |
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| examples | ||
| dht.cpp | ||
| dht.h | ||
| readme.txt | ||
The DHT11, 21, 22, 33 and 44 are relative inexpensive sensors for measuring temperature and humidity. This library can be used for reading both values from these DHT sensors. The DHT11 only returns integers (e.g. 20) and does not support negative values. The others are quite similar and provide one decimal digit (e.g. 20.2) The hardware pins of the sensors and handshake are identical so ideal to combine in one lib. The library (0.1.13 version) is confirmed to work on: UNO (tested myself) 2009 (tested myself) MEGA2560 DUE attiny85 @8MHz Digistump Digix @ 84 MHz More information - http://playground.arduino.cc//Main/DHTLib - Notes: version 0.1.13 is the last stable version for both AVR and ARM version 0.1.14 and up are not compatible anymore with pre 1.0 Arduino version 0.1.14 and up have breaking changes wrt ARM based arduino's e.g DUE. version 0.1.15 is stable version for AVR only version 0.1.16 and 0.1.17 have breaking changes for DHT11 version 0.1.18 works again for DHT11 (avr only) version 0.1.19 fixed masking bug DHT11 (avr only) version 0.1.20 Reduce footprint (34 bytes) by using int8_t as error codes. (thanks to chaveiro)