MMM-DHT-Sensor

This a module for the MagicMirror.

This module gets data form DHT11, DHT22 and AM2302 sensors.

bcm2835

This module uses node-dht-sensor to get the sensor data, and this module depends on bcm2835 to do so, therefore you need to install it in your Pi in order to use this module.

cd ~
wget http://www.airspayce.com/mikem/bcm2835/bcm2835-1.52.tar.gz
tar zxvf bcm2835-1.52.tar.gz
cd bcm2835-1.52
./configure
make
sudo make check
sudo make install

Installation

git clone https://github.com/ryck/MMM-DHT-Sensor.git
cd MMM-DHT-Sensor
npm install

Config

The entry in config.js can include the following options:

Option	Description
sensorPin	Required This is the GPIO pin the sensor is connected to. Note: This is not the hardware pin number. Type: integer
sensorType	Required This is the the sensor type. It should work for DHT11, DHT22 and AM2302 sensors Type: integer Possible values: 11 for DHT11 or 22 for DHT22 / AM2302
units	What units to use. Specified by config.js Type: string Possible values: config.units = Specified by config.js, metric = Celsius, imperial =Fahrenheit Default value: config.units
updateInterval	How often the sendor data is updated. Type: integer Default value: 1 hour
relativeScale	Relative scale to choose the temparature icon. Type: integer Default value: 30
initialLoadDelay	The initial delay before loading. If you have multiple modules that use the same API key, you might want to delay one of the requests. (Milliseconds) Type: integer Possible values: 1000 - 5000 Default value: 0
animationSpeed	Speed of the update animation. (Milliseconds) Type: integer Possible values:0 - 5000 Default value: 1000 (1 second)
debug	Show debug information. Possible values: true or false Default value: false

Here is an example of an entry in config.js

{
	module: "MMM-DHT-Sensor",
	position: "top_right",
	header: "Upstairs",
	config: {
		sensorPin: 2,
		sensorType: 22,
		updateInterval: 60 * 60 * 1000,
		initialLoadDelay: 0,
		animationSpeed: 1000,
		units: "metric",
		relativeScale: 35,
		debug: false
	}
},

Notes

• A good resource to know the GPIO/Hardware pin number is (https://pinout.xyz/)

Notifications

This module implements the following notifications:

• INDOOR_TEMPERATURE (int) Temperature in Celsius
• INDOOR_HUMIDITY (int) Humidity in relative humidity (%)

Dependencies

• bcm2835
• node-dht-sensor (installed via npm install)

Issues

WARNING! Could not load config file. Starting with default configuration. Error found: Error: The module '/home/pi/MagicMirror/modules/MMM-DHT-Sensor/node_modules/node-dht-sensor/build/Release/node_dht_sensor.node'
was compiled against a different Node.js version using
NODE_MODULE_VERSION 48. This version of Node.js requires
NODE_MODULE_VERSION 53. Please try re-compiling or re-installing
the module (for instance, using `npm rebuild` or`npm install`).

If you get this error after installing the module (or your MagicMirror is just a black screen) try this:

cd MMM-DHT-Sensor
npm run rebuild

Thanks To...

• Cato Antonsen for the MMM-Temperature-Humidity module, which I used as reference.
• Nick Wootton for the MMM-UKLiveBusStopInfo module, which I used as reference.
• Nigel Daniels for the MMM-Tube-Status module, which I used as reference.
• Michael Teeuw for the MagicMirror2 framework that made this module possible.