MagicMirror module to read DHT22 sensor via the loldht libraries
When MagicMirror is run in a Docker container, everything seems to be the same...HOWEVER, when it comes to Raspberry pi + 64bit OS + GPIO + further privileges, all of them failed (at least to me).
The basis of all approaches is the wiringpi library. On top of this, there are several implementations, but most famous (I guess) are the dht22 and lol_dht22. I usually used the latter one as it by default gives celsius degree instead of Fahrenheit. However, most DHT22 Magicmirror modules, e.g., Bangee44,nebulx29,ryck, were using another one.
If you run your MagicMirror on the host OS, you probably won't get any issue.
When Magicmirror is in a container, then the story becomes a bit more complicated.
Even if I added all capabilities to a container (via CAP_ADD), or elevating the whole container into privileged mode, none of the modules mentioned above were ever able to read the GPIO pins properly.
Yes, I know, there further things to pay attention to when running magicmirror in a container, e.g., '/sys/class/gpio:/sys/class/gpio' added as volume, '/dev/mem:/dev/mem', '/dev/gpiomem:/dev/gpiomem','/dev/ttyAMA0:/dev/ttyAMA0' added as device, but still, it was not working straight away.
Then, you can still go into the container to manually install the libraries needed inside the container...though, the original magicmirror docker image does not have too much BASH if you get what I mean :)
Anyway, I relied on lol_dht22, compiled it within a magicmirror container, and developed this magicmirror module you are currently looking at, and it works for me finally inside a container.
If you want a fully prepared magicmirror in a container for raspberry pi aarch64 (arm64), check out my MagicMirror repository https://github.com/cslev/docker-MagicMirror
Note, if you already run MagicMirror in a container, even if you have lol_dht22 installed inside, after adding this module, you have to restart the container, otherwise it does not always work. But this is just a one time restart :)
{
module: 'MMM-loldht22',
position: 'top_right',
config: {
sensorLocation: "Living room",
showLocation: true,
updateInterval: 10, //in minutes
animationSpeed: 1000,
scriptPath: "/tmp/lol_dht22/loldht",
gpioPin: 7,
vertical: false, //horizontal vs. vertical layout
highTempIcon: '<i class="fas fa-thermometer-three-quarters"></i>',
mediumTempIcon: '<i class="fas fa-thermometer-half"></i>',
lowTempIcon: '<i class="fas fa-thermometer-quarter"></i>',
freezeTempIcon: '<i class="fas fa-thermometer-empty"></i>',
iconHum: '<i class="fas fa-tint"></i>', //fontawesome HTML tag - iconTemp cannot be changed, it's a thermometer
humColor: '#365fbf', //only if colored is true
iconHome: '<i class="fas fa-house-user"></i>', //fontawesome HTML tag
colored: false, //Colored icons
highTempStartsAt: 28, //three-quarter thermometer logo
highColor: '#ec1515', //only if colored is true
mediumTempStartsAt: 24, // half thermometer logo
mediumColor: '#e8b928', //only if colored is true
lowTempStartsAt: 16, // quarter thermometer logo
lowColor: '#0fd257', //only if colored is true
freezeTempStartsAt: 0, //empty thermometer logo
freezeColor: '#0f99d2', //only if colored is true
fontSize: '50px',
iconSize: '50px',
headerFontSize: '22px',
headerIconSize: '22px',
rowPadding: '12px', //only makes sense if vertical is true
debug: false //setup whether you want debug info in console
}
},
| Option | Description |
|---|---|
| sensorLocation | Indicate where the sensor is deployed. Default: Living room |
| showLocation | Indicate if you want the location above to be shown. Default true. |
| updateInterval | Indicate the update interval in minutes! We don't have to set this to a low value, things don't change to much within seconds. Default: 10 (minutes) |
| animationSpeed | Typical setting :). Default: 1000 |
| scriptPath | Where the loldht binary is located. Default /tmp/lol_dht22/loldht |
| gpioPin | GPIO pin the DHT22 sensor is connected to. Default 7 |
| vertical | Horizontal or vertical layout. Default true |
| highTempIcon | Temp icon if temperature is HIGH. HIGH is defined via highTempStartsAt. Change default icons if you want by fontawesome. Default <i class="fas fa-thermometer-three-quarters"></i> |
| mediumTempIcon | Temp icon if temperature is MEDIUM. MEDIUM is defined via mediumTempStartsAt.Change default icons if you want by fontawesome. Default <i class="fas fa-thermometer-half"></i> |
| lowTempIcon | Temp icon if temperature is LOW. LOW is defined via lowTempStartsAt.Change default icons if you want by fontawesome. Default <i class="fas fa-thermometer-quarters"></i> |
| freezeTempIcon | Temp icon if temperature is FREEZE. FREEZE is defined via freezeTempStartsAt.Change default icons if you want by fontawesome. Default <i class="fas fa-thermometer-empty"></i> |
| highTempStartsAt | Define the temperature when it is considered HIGH. Default 28 |
| mediumTempStartsAt | Define the temperature when it is considered MEDIUM. Default 24 |
| lowTempStartsAt | Define the temperature when it is considered LOW. Default 16 |
| freezeTempStartsAt | Define the temperature when it is considered FREEZE. Default 0 |
| highColor | Define the color (in mode colored:true) when temperature is considered HIGH. Default #ec1515 |
| mediumColor | Define the color (in mode colored:true) when temperature is considered MEDIUM. Default #e8b928 |
| lowColor | Define the color (in mode colored:true) when temperature is considered LOW. Default #0fd257 |
| freezeColor | Define the color (in mode colored:true) when temperature is considered FREEZE. Default #0f99d2 |
| iconHum | Humidity icon. Change default icons if you want by fontawesome. Default <i class="fas fa-tint"></i> |
| iconHome | : Location icon. Change default icons if you want by fontawesome. Default <i class="fas fa-house-user"></i> |
| fontSize | : Granular CSS setting for the font sizes of humidity and temperature. Default 20px |
| iconSize | : Granular CSS setting for the icon sizes of humidity and temperature. Default 20px |
| headerFontSize | : Granular CSS setting for the header font size. Default 18px |
| headerIconSize | : Granular CSS setting for the header icon size. Default 18px |
| rowPadding | : Granular CSS setting for the row padding when layout is vertical. Default 10px |
| debug | : If you want debug messages in the console / docker logs. Default: true |
| Layout | View |
|---|---|
| vertical |  |
| horizontal |  |
| vertical colorized with big fonts |  |