Not running at RPi3

[abataille]

I have install BCM2835 successfully.
Then I install the node-dht-sensor.
From your test I ran
sudo node duty.js 22 17
BCM2835 initialized.
Error: failed to read sensor

The same works fine with an Raspberry Pi 1.
Any idea ?

[momenso]

Hi @abataille.
It is most likely this is a wiring issue, other than that, I see you enabled verbose mode so you should have more info on the log file (i.e. dht-sensor.log).
If you followed the wiring diagram given as examples, please make sure you connected the sensor ground pin to GPIO Ground (e.g. pin 20, or any other ground available) and not GPIO 21.

[abataille]

Data s Pin 17 and ground is the rightmost ground.
Is it possible that the bcm2835 library does not work correctly because the pi3 has a bcm2837 chip?

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On 13 Nov 2016, at 17:02, David Jose Momenso notifications@github.com wrote:

Hi @abataille.
It is most likely this is a wiring issue, other than that, I see you enabled verbose mode so you should have more info on the log file (i.e. dht-sensor.log).
If you followed the wiring diagram given as examples, please make sure you connected the sensor ground pin to GPIO Ground (e.g. pin 20, or any other ground available) and not GPIO 21.

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[momenso]

Not at all. If you are using the latest bcm2835 library that should not be a problem.
What do you see on the dht-sensor.log file?

[abataille]

I can check that tomorrow when I have access to that log.

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On 13 Nov 2016, at 18:10, David Jose Momenso notifications@github.com wrote:

Not at all. If you are using the latest bcm2835 library that should not be a problem.
What do you see on the dht-sensor.log file?

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[abataille]

the log shows:
start sensor read (type=22, pin=17).
*** timeout #1

[abataille]

I also changed the bcm2385 lib to v. 50 and the pin to pin 16.
The log now shows:
start sensor read (type=22, pin=16).
*** timeout #2

[momenso]

It does look like the sensor is not connected (or not responding) on the pin you specified.
I recommend you double check your wiring. For example, if you're connecting to GPIO Pin 17 it should look like this:

[abataille]

I already have this wiring, except I get 3.3V and ground from other pins.
Is there a chance that the bcm library does not work with the 64bit architecture the way we expect?

On 15 Nov 2016, at 02:15, David Jose Momenso notifications@github.com wrote:

It does look like the sensor is not connected (or not responding) on the pin you specified.
I recommend you double check your wiring. For example, if you're connecting to GPIO Pin 17 it should look like this:
https://cloud.githubusercontent.com/assets/420851/20289267/10486c88-aac0-11e6-9997-f83b0f2dc134.png
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[abataille]

Just to make sure that nothing is wrong with Jessie and the hardware.
I used a small phyton script i.e.
sudo ./AdafruitDHT.py 22 17
Temp=23.1* Humidity=47.3%
That showed it somehow works.

[momenso]

There should be no problem with BCM library on 64bit. I have the same setup here working fine.

pi@raspberrypi:~/node-dht-sensor $ uname -a
Linux raspberrypi 4.4.26-v7+ #915 SMP Thu Oct 20 17:08:44 BST 2016 armv7l GNU/Linux
pi@raspberrypi:~/node-dht-sensor $ lsb_release -d
Description:    Raspbian GNU/Linux 8.0 (jessie)

Simple read test:

pi@raspberrypi:~/node-dht-sensor $ node test/async-explicit.js 22 17 1
temperature: 22.4°C, humidity: 82.4%, time: 25ms

Also, if this python script from Adafruit is working it validates your wiring.

Can you try npm list to double check node-dht-sensor version?
You should get something like this:

pi@raspberrypi:~/node-dht-sensor $ npm list
node-dht-sensor@0.0.32 /home/pi/node-dht-sensor
└── nan@2.4.0

[abataille]

My installation just looks the same.
Is there a chance that the modules are in too different locations?
node-dht-sensor ist located in /usr/lib/node_modules/node-dht-sensor
libbcm2835a is located in /usr/local/lib

On 15 Nov 2016, at 13:41, David Jose Momenso notifications@github.com wrote:

There should be no problem with BCM library on 64bit. I have the same setup here working fine.

pi@raspberrypi:/node-dht-sensor $ uname -a
Linux raspberrypi 4.4.26-v7+ #915 SMP Thu Oct 20 17:08:44 BST 2016 armv7l GNU/Linux
pi@raspberrypi:/node-dht-sensor $ lsb_release -d
Description: Raspbian GNU/Linux 8.0 (jessie)
https://cloud.githubusercontent.com/assets/420851/20305948/33f7db32-ab1f-11e6-966a-52ae42e203de.png
Simple read test:

pi@raspberrypi:~/node-dht-sensor $ node test/async-explicit.js 22 17 1
temperature: 22.4°C, humidity: 82.4%, time: 25ms
Also, if this python script from Adafruit is working it validates your wiring.

Can you try npm list to double check node-dht-sensor version?
You should get something like this:

pi@raspberrypi:~/node-dht-sensor $ npm list
node-dht-sensor@0.0.32 /home/pi/node-dht-sensor
└── nan@2.4.0
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[momenso]

Your libbcm2835.a is in the default location and it seems that you installed node-dht-sensor globally, right? Anyway, that should not be a problem either. Although not common, you could try setting NODE_PATH to your node modules directory to make sure it is loading modules from where you expect, such as:

$ export NODE_PATH=/usr/lib/node_modules

One more thing we could check is node and npm versions you are running.

$ node -v
v7.1.0
$ npm -v
3.10.9

If all that is fine, here is a complete valitation procedure you can follow assuming BCM2835 library is already installed:

1. Download node-dht-sensor from github

pi@raspberrypi:~/project $ git clone https://github.com/momenso/node-dht-sensor.git
Cloning into 'node-dht-sensor'...
remote: Counting objects: 409, done.
remote: Compressing objects: 100% (15/15), done.
remote: Total 409 (delta 6), reused 0 (delta 0), pack-reused 394
Receiving objects: 100% (409/409), 82.10 KiB | 0 bytes/s, done.
Resolving deltas: 100% (236/236), done.
Checking connectivity... done.

2. Go to the project folder and install the module

pi@raspberrypi:~/project $ cd node-dht-sensor/
pi@raspberrypi:~/project/node-dht-sensor $ npm install

> node-dht-sensor@0.0.32 preinstall /home/pi/project/node-dht-sensor
> ./check-lib.sh

Library bcm2835 found.

> node-dht-sensor@0.0.32 install /home/pi/project/node-dht-sensor
> node-gyp configure

> node-dht-sensor@0.0.32 postinstall /home/pi/project/node-dht-sensor
> node-gyp build

make: Entering directory '/home/pi/project/node-dht-sensor/build'
  CXX(target) Release/obj.target/node_dht_sensor/node-dht-sensor.o
  CXX(target) Release/obj.target/node_dht_sensor/dht-sensor.o
  SOLINK_MODULE(target) Release/obj.target/node_dht_sensor.node
  COPY Release/node_dht_sensor.node
make: Leaving directory '/home/pi/project/node-dht-sensor/build'
node-dht-sensor@0.0.32 /home/pi/project/node-dht-sensor
└── nan@2.4.0 

3. Execute a simple reading test (sensor DHT22 on GPIO pin 17).

pi@raspberrypi:~/project/node-dht-sensor $ node test/async-explicit.js 22 17 1
temperature: 22.7°C, humidity: 80.2%, time: 20ms

[abataille]

Miracle. That worked.
Thank you for all your help !!

[JonHeron]

Hello,
uname -a Linux raspberrypi 4.14.98-v7+ #1200 SMP Tue Feb 12 20:27:48 GMT 2019 armv7l GNU/Linux lsb_release -d Description: Raspbian GNU/Linux 9.8 (stretch)
npm list (node:1467) [DEP0022] DeprecationWarning: os.tmpDir() is deprecated. Use os.tmpdir() instead. node-dht-sensor@0.0.34 /home/pi/Downloads/node-dht-sensor └── nan@2.8.0 node -v v8.11.1 npm -v 1.4.21 (node:1482) [DEP0022] DeprecationWarning: os.tmpDir() is deprecated. Use os.tmpdir() instead.

I have been running a pi out in the greenhouse since last spring and I just noticed the temp/humidity DHT11 sensor stopped working.
I just figured the sensor went bad so I ordered another and... woops the sensor is fine...
I have a spare Pi so I decided to try to get a spare DHT11 running on a fresh install.
Still no joy. Something must have borked in an update, maybe?
I tried your complete validation method above, it installs fine but it still cant read the sensor.
pi@raspberrypi:~/Downloads/node-dht-sensor $ node test/async-explicit.js 11 04 1 Error: failed to read sensor
dht-sensor.log is not present on my system.
Are there any other troubleshooting suggestions?
Cheers,
Jon

[JonHeron]

Solved, I had the wrong pinout for the 3 pin sensor. DOH!
Cheers,
Jon