Platform: pi 3 model B+ rev.1.3 OS: Rasbian Node-RED: 1.0.5 Node.js: v12.17.0 problem node: node-red-contrib-dht-sensor v1.0.4 bcm2385 revision. a020d3 DHT22 sensor: AM2302 [image] Hello I'm new in using Nodered but I found it perfect for my home automation project. I bought 2 sensors DHT22…

Hello I bought and tested a new sensor DHT22 (a branded one) and now it works fine. So my problem was the sensor. I suggest to buy brended sensors and not generic unbrended sensors and of course to use the good node-red-contrib-dht-sensor. Thanks to gerry and zenofmud for your suggestions

I had the same thing happen when I switched from a dht11 to dht22. What finally fixed mine was changing the pin numbering from physical pins to bcm. Sounds dumb but it worked.

[image] gerry: Sounds dumb but it worked. Thanks gerry for your suggestion but in my case it doesn't work. I changed from Physical pins (rev.2) to BCM gpio [image] following my wiring connection [image] but I always received wrong values: {"_msgid":"e68c589b.d4d8f8","topic":"rpi-dht22_…

Just to verify, did you install the BCM2835 library and node-dht-sensor as it says in the pre-req's ?

No I didn't install the BMC libraries as told in the pre-req's. But I just do it and update the BMC to the version 1.65: [image] Then I followed the other 2 steps in pre-req's and I re-installed the node-dht-sensor dependency and the node-red-contrib-dht-sensor node. And I updated npm to the lat…

After installing the BMC v1.65 library, node-dth-sensor and then the node-red-contrib-dht-sensor, I wired up a dht22 using: Pin 1 (3.3v) to pin 1 of the dht22 Pin 6 (Gnd) to pin 4 of the dht22 Pin 16 (BCM 23) to pin 2 of the dht22 and a 10K resistor between pins 1 and 2 of the dht22 the node is…

Just a note: Be careful with the resistor as many of the packaged DHT sensors have the resistor already in the circuit. I don't know if the DHT you are using has one or not but read the data sheet carefully.

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DHT22 AM2302 sensor doesn't work in nodered

General

zenofmud 31 May 2020 15:05 6

Are you sure you have the pins connected properly? Is it possible the dht22 pin outs on the board are different than the dht11?

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DHT22 AM2302 sensor doesn't work in nodered

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