I finally got the idDHT22 library for Spark working. It is an interrupt driven, non-blocking version of the DHT22 library. The library can be found on my github :smile:

[image] peekay123: I will put the code up on my repo for you to test Did you upload this yet as I checked the existing github and can't find anything with the changes you mentioned.

@v8dave , I was getting odd behaviour from the code and decided to not post it. Instead, I will be posting the new non-blocking code that will include the DH11 stuff as well as stall recovery.

Great. Looking forward to testing it. In the mean time I am completing the rest of the code for the other sensors.

Hi, I can confirm that the DHT22 stalls in some occasion. Using an oscilloscope I found some issues: running the data wire on a digital pin (D0-D7) the core produces during powerup or awake from deep-sleep a short low pulses wich triggers the DHT22. In this situation the pin is set as outport an…

The sensor has stalled twice today running it on 3V3. Now I testing 5V on power pin and data line pullup to 3V3 to be compatible with analog pin. There are many datasheet available and the min. voltage for this sensor goes from 3V to 3.6V

@digixx , I am still working on my true non-blocking and stall recovering library. I am in the debugging phase and hope to be finished very soon. I still don’t understand why the DHT22 stalls in the first place which really bothers me. If anyone has any thoughts on that, it would be good to brains…

@peekay123 , because the sensor only needs a 1ms low pulse (10us works too), what else can we send to them to send data? In the picture you see the added 4 NiMh batteries for 5V power support. More results tomorrow … Your driver software is a very nice piece of work. I just tried to figure out why t…

@digixx , I would love to take credit for that library but I only adapted from a great Arduino library by Scott Piette. I don’t know why the DHT22 seems to work then stall. I have tried it at 3.3V and 5V and it does the same thing with the library. So I am writing a library that can recover when i…

I found a big issue [image] Delay() does not work (accurately) Hi, During debugging the DHT22 Lib I found out that the function delay(1) does not delay 1msec. To reproduce the error I wrote this short code for test. void setup() { pinMode(A7, OUTPUT); } void loop() { digitalWr…

Wow - this is a great thread on the DHT Non-Blocking interrupt library I ported back in Jan. @peekay123 has done a great job along with @digixx and @v8dave debugging it and trying to figure out how to keep it from hanging. @peekay123 Since you have the library on Spark IDE, I forked your librar…

Non-blocking interrupt driven DHT22 library

mtnscott October 14, 2014, 5:32pm 75

@peekay123, @francisdb, @digixx, @v8dave I have published a newer version of this library. Feel free to try it and let me know how well it works. The class name changed but the methods should be the same.

Topic		Replies	Views
[Submission] Updated Non-blocking Interrupt Driven DHT Sensor Library Libraries	35	12056	January 22, 2019
DHT22, DHT11 and similar (Blocking version) Libraries	120	24293	July 17, 2014
Wrong reading value for DH22 & get stuck after running for a while Libraries	17	20200	August 17, 2015
PLEASE do not use the idDHT22 library Libraries	17	5165	October 25, 2015
DHT22 returns temp = 0, hum = 6553 Hardware photon	30	3943	November 7, 2021

Non-blocking interrupt driven DHT22 library

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