No data in RPiMonitor from AM2302

[Henk-Kuik]

I have a RaspberryPi Zero W with Raspbian Buster with desktop running on it. Next to that I have a AM2302/DHT22 sensor with power on pin 2 (5 v), ground on pin 6 and data on pin 7 (GPIO 4).

I installed RPiMonitor and did no configuration what so ever other then what follows.

In /etc/rpimonitor I only unchecked the line [include=/etc/rpimonitor/template/dht11.conf] in data.conf So, I removed the hash.

I edited /etc/rpimonitor/template/dht11.conf to work with a am2302 on gpio pin 4. Here is that file. dht11.conf

########################################################################

Extract temperature and humidity from DHT11/DHT22

Page: 2

Information Status Statistics

- tempetature - yes - yes

- humidity - yes - yes

#######################################################################

Add new pages (number 2)

web.status.2.name=Living room web.statistics.2.name=Living room

Get dynamic data

dynamic.1.name=living_room_temp dynamic.1.source=Adafruit_DHT 2302 4 dynamic.1.regexp=t=(\d+)$ dynamic.1.postprocess=$1/1000 dynamic.1.rrd=GAUGE

dynamic.2.name=humidity dynamic.2.source=Adafruit_DHT 2302 4 dynamic.2.regexp=Hum = (\S+) dynamic.2.postprocess= dynamic.2.rrd=GAUGE

Add a line of status in page number 2

web.status.2.content.1.name=Temperature web.status.2.content.1.icon=cpu_temp.png web.status.2.content.1.line.1="Ambient Temperature: "+data.living_room_temp+"°C" web.status.2.content.1.line.2="Ambient Humidity: "+data.humidity+"%"

Add a statistic graph (with 2 curves suing separate scales) in page number 2

web.statistics.2.content.1.name=Temperature web.statistics.2.content.1.graph.1=living_room_temp web.statistics.2.content.1.graph.2=humidity web.statistics.2.content.1.ds_graph_options.living_room_temp.label=Ambient temp. (deg C) web.statistics.2.content.1.ds_graph_options.humidity.label=Humidity (%) web.statistics.2.content.1.ds_graph_options.humidity.yaxis=2 web.statistics.2.content.1.graph_options.legend= { position: "sw"} web.statistics.2.content.1.graph_options.y2axis={ position: "right", min: 0, max: 100 }

Restarted RPiMonitor with [sudo service rpimonitor restart] but getting no data at all from the am2302 sensor. Ambient Temperature: undefined°C Ambient Humidity: undefined%

The AM2302/DHT22 sensor is working because when I do [sudo /home/pi/sources/Adafruit_Python_DHT/examples/AdafruitDHT.py 2302 4] I am getting output from this sensor. For that I did install the Adafruit_Python_DHT sensor library obviously and I did this before installing RPiMonitor.

In other words, I am missing or overlooking something but for the life of me I can not see what that is. Can someone push me in the right direction please? I would appreciate it very much.

[Leepic]

Hello,

I think it's because your source is wrong. Adafruit_DHT is on your $PATH? Replace source=Adafruit_DHT 2302 4 by source=/home/pi/sources/Adafruit_Python_DHT/examples/AdafruitDHT.py 2302 4

and maybe your regexp is wrong too because you need to get only number (% and °C), not string. Try this instead:

 dynamic.1.regexp=(\d+)$

 dynamic.2.regexp=(\d+)$

[Henk-Kuik]

I have added [ /home/pi/sources/Adafruit_Python_DHT/examples ] to PATH and when I do [ echo $PATH ] it does show up. In DHT11.conf I gave source the full path as you mentioned and I edited regexp also to what you mentioned but still I get no data. All I get is Ambient Temperature: 0.00°C Ambient Humidity: 0.00%

[Leepic]

Have you follow the steps describe in the doc? https://xavierberger.github.io/RPi-Monitor-docs/32_sensors.html#software-installation

if you add sudo in the source, have you got values?

[Henk-Kuik]

I am very sorry to inform you that the tutorial you mention is not working anymore. Immediately after step one I get a zero kB file back and a 404: Not Found error.

[Leepic]

Yes, it's because the repository was read-only and the old code was moved to the legacy branch. So, try this instead to download: wget https://github.com/adafruit/Adafruit-Raspberry-Pi-Python-Code/raw/legacy/Adafruit_DHT_Driver/Adafruit_DHT --output-document Adafruit_DHT