MMM-Temperature/Humidity Module (DHT11, DHT22 and AM2302 sensors.)

psk

@cowboysdude DHT11 - This is the sensor that I am using.

It has three pins -
+ve - Connected to 5v
-ve - Ground
Data - Connected to pin 2

@Bangee Now, I am running as sudo npm start. Without sudo, it will throw an exception that says it cannot open dev/mem

This is the module screenshot.

Bangee

I’m using node-dht-sensor

As user pi I don’t have an error but after starting MagicMirror thers a crash.

@psk you should cool down your room :-)

cowboysdude

I really do like this! Great job!

psk

@Bangee According to bcm2835 v1.50-

"Running as root
Prior to the release of Raspbian Jessie in Feb 2016, access to any peripheral device via /dev/mem on the RPi required the process to run as root. Raspbian Jessie permits non-root users to access the GPIO peripheral (only) via /dev/gpiomem, and this library supports that limited mode of operation.

If the library runs with effective UID of 0 (ie root), then bcm2835_init() will attempt to open /dev/mem, and, if successful, it will permit use of all peripherals and library functions.

If the library runs with any other effective UID (ie not root), then bcm2835_init() will attempt to open /dev/gpiomem, and, if successful, will only permit GPIO operations. In particular, bcm2835_spi_begin() and bcm2835_i2c_begin() will return false and all other non-gpio operations may fail silently or crash."

So i guess we have run with sudo until some other library comes up :D

PS: I should!! Its too hot in here… :D :D

@cowboysdude Thanks! Cheers :D

jsyzthz

@psk i’m following your steps.but got some errors
0_1475156462089_upload-b782b89f-2067-4c7d-92ed-d69124b72d1c
can you help me to take a look? thanks!

psk

@jsyzthz I ran into the same while setting up!

try this. Go to MMM-Temperature-Humidity,

npm rebuild --runtime=electron --target=1.4.0 --disturl=https://atom.io/download/atom-shell --build-from-source

My Electron version is 1.4.0. If yours is different, replace accordingly. :D

This is a known issue which is caused by the serialport module using native code that is built for a different version of Node. You can read a bit more about addons here, if you’re interested; they’re just modules written in C/C++ that can interface with Node so the module can interface with the hardware more easily.

Credits : stackoverflow.com

Note from admin: Please use Markdown on code snippets for easier reading!

psk

@jsyzthz
I’m not sure whether to rebuild in MMM-Temperature-humidity directory or the Magic Mirror directory.
Try executing in the MagicMirror directory first.

npm rebuild --runtime=electron --target=1.4.0 --disturl=https://atom.io/download/atom-shell --build-from-source

Also you can find the electron version by : npm list

Just in case, i had this in my commands history :D
npm rebuild --runtime=electron --target=1.3.4 --disturl=https://atom.io/download/atom-shell --abi=49 -d

jsyzthz

@psk i use the first command. it woks now.thx!

psk

@jsyzthz Glad I could help :D :D

H3L1o150

Hi, i am really new on this, someone can help me, with the code on config.js file?

     {
                module: 'MMM-Temperature-Humidity',
                position: 'bottom_bar',
                config: {
                  var dht = new rpiDhtSensor.DHT11(21);
	    }
      },

thanks